WO2010098115A1 - 波長変換レーザ光源及び画像表示装置 - Google Patents
波長変換レーザ光源及び画像表示装置 Download PDFInfo
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- WO2010098115A1 WO2010098115A1 PCT/JP2010/001292 JP2010001292W WO2010098115A1 WO 2010098115 A1 WO2010098115 A1 WO 2010098115A1 JP 2010001292 W JP2010001292 W JP 2010001292W WO 2010098115 A1 WO2010098115 A1 WO 2010098115A1
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- wavelength conversion
- fundamental wave
- conversion element
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- mirror
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/3501—Constructional details or arrangements of non-linear optical devices, e.g. shape of non-linear crystals
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
- G02F1/3542—Multipass arrangements, i.e. arrangements to make light pass multiple times through the same element, e.g. using an enhancement cavity
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
- G02F1/3544—Particular phase matching techniques
- G02F1/3548—Quasi phase matching [QPM], e.g. using a periodic domain inverted structure
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/17—Multi-pass arrangements, i.e. arrangements to pass light a plurality of times through the same element, e.g. by using an enhancement cavity
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/12—Function characteristic spatial light modulator
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/60—Temperature independent
Definitions
- the present invention relates to a wavelength conversion laser light source for converting the wavelength of a fundamental laser beam and an image display apparatus using the light source.
- Laser light sources widely used as embedded devices in industrial applications and consumer devices include semiconductor laser diodes and solid-state laser light sources. Further, there is a wavelength conversion laser light source as a light source for obtaining a laser beam having a wavelength that makes it difficult to directly oscillate a semiconductor laser diode or a solid-state laser light source.
- SHG Silicon Harmonic Generation
- fundamental wave fundamental laser light
- FIG. 23 shows an example of a wavelength conversion laser light source that has been conventionally proposed and generates the second harmonic.
- the wavelength conversion laser light source includes a fundamental wave laser light source 111 that generates a fundamental wave, a lens 112 that collects the fundamental wave emitted from the fundamental wave laser light source 111 and enters the wavelength conversion element 113, and a second fundamental wave light source. It comprises a wavelength conversion element 113 that generates harmonics, and a dichroic mirror 114 that separates the fundamental wave FL (transmission fundamental wave laser) and the second harmonic SL (wavelength conversion laser).
- the second harmonic is generated by passing the wavelength conversion element 113 only once.
- the wavelength conversion element 113 is made of a nonlinear optical crystal, and it is necessary to control the orientation of the crystal and the period of the domain-inverted structure so that the phases of the fundamental wave and the second harmonic coincide with each other.
- a quasi-phase matching type wavelength conversion element using a periodically poled structure can perform wavelength conversion with high efficiency, and a fundamental wave of an arbitrary wavelength can be changed to a second harmonic by designing a polarization inversion period. It is widely used because it can be converted.
- the wavelength conversion efficiency ⁇ from the fundamental wave to the second harmonic is expressed as follows: the interaction length of the wavelength conversion element is L, the power of the fundamental wave is P, the beam cross-sectional area at the wavelength conversion element is A, and the phase matching condition When the phase difference between the fundamental wave and the second harmonic is ⁇ k, the following equation (1) is obtained.
- the interaction length L increases, conditions for reducing the phase difference ⁇ k between the fundamental wave and the second harmonic wave (for example, the incident angle of the fundamental wave and the temperature condition of the wavelength conversion element) become stricter, and therefore the wavelength conversion efficiency. Is significantly reduced, and the interaction length L is practically limited.
- the interaction length L is limited by the temperature condition of the wavelength conversion element, and it has been difficult to achieve high efficiency.
- the temperature of the wavelength conversion element when the phase difference ⁇ k between the fundamental wave and the second harmonic is 0 is called the phase matching temperature
- the temperature width of the wavelength conversion element at which the wavelength conversion efficiency is halved is called the temperature tolerance. Yes.
- Patent Document 1 proposes to increase the wavelength conversion efficiency by using a plurality of wavelength conversion elements and condensing means.
- Patent Document 2 proposes that a fundamental wave reflector is provided on the wavelength conversion element by means of fundamental wave reflection means, and is incident again on the wavelength conversion element.
- Patent Document 3 proposes that a wavelength conversion element is disposed between opposing concave mirrors to perform wavelength conversion of a reciprocating fundamental wave.
- the wavelength conversion efficiency of the wavelength conversion laser light source can be improved, but there is a problem that the wavelength conversion efficiency varies greatly depending on the temperature change of the wavelength conversion element.
- the object of the present invention is to increase the temperature tolerance of the wavelength conversion element while maintaining high wavelength conversion efficiency, and to suppress fluctuations in the wavelength conversion efficiency of the wavelength conversion element due to unnecessary fundamental waves.
- An object of the present invention is to provide a wavelength conversion laser light source capable of high output and high stability.
- a wavelength conversion laser light source includes a fundamental wave laser light source for generating a fundamental wave, a first mirror and a second mirror arranged to face each other, the first mirror, and the A wavelength conversion element that is arranged between the second mirror and converts the wavelength of the fundamental wave; and a temperature control unit that controls the temperature of the wavelength conversion element.
- a part of the fundamental wave is wavelength-converted, and a fundamental wave that is not wavelength-converted is reflected by the first mirror and the second mirror, repeatedly incident on the wavelength conversion element, and wavelength-converted.
- a control part is arrange
- the allowable temperature range of the wavelength conversion element can be expanded while maintaining high wavelength conversion efficiency, and fluctuations in the wavelength conversion efficiency of the wavelength conversion element due to unnecessary fundamental waves are suppressed. Therefore, a high-power and high-stable wavelength conversion laser light source can be realized.
- FIG. 5 is a diagram showing the diameter of the fundamental wave beam at a position where the fundamental wave enters the wavelength conversion element in each path shown in FIG.
- FIG. 2 is a top view of a wavelength conversion laser light source using a fundamental wave reflection mirror in place of the fundamental wave absorber in the wavelength conversion laser light source shown in FIG. 1. It is a side view of the wavelength conversion laser light source shown in FIG.
- Embodiment 2 of this invention It is a top view of the wavelength conversion laser light source in Embodiment 2 of this invention. It is a side view of the wavelength conversion laser light source shown in FIG. It is a top view of the wavelength conversion laser light source in Embodiment 3 of this invention. It is a side view of the wavelength conversion laser light source shown in FIG. It is a top view of the wavelength conversion laser light source in Embodiment 4 of this invention. It is a side view of the wavelength conversion laser light source shown in FIG. It is a figure which shows the change of the diameter of the beam of the fundamental wave in the element thickness direction at the time of the incidence to the wavelength conversion element in Embodiment 4 of this invention. It is a schematic block diagram shown about an example of a structure of the liquid crystal display device in Embodiment 5 of this invention. It is a schematic diagram of the conventional wavelength conversion laser light source.
- FIG. 1 and 2 are diagrams showing an example of the configuration of the wavelength conversion laser light source according to Embodiment 1 of the present invention.
- FIG. 1 is a diagram of the configuration of the wavelength conversion laser light source according to Embodiment 1 as viewed from above.
- FIG. 2 is a side view of the configuration of the wavelength conversion laser light source shown in FIG.
- the directions indicated by the arrow 10 in FIG. 1 and the arrow 11 in FIG. 2 are the element width direction (width direction of the wavelength conversion element 3) and the element thickness direction (thickness direction of the wavelength conversion element 3), respectively.
- 1 is a fundamental laser light source for generating a fundamental wave
- 2 is a condensing optical system for condensing the fundamental wave
- 3 is for converting the fundamental wave into a second harmonic.
- 4 is a first concave mirror having a curvature R1
- 5 is a second concave mirror having a curvature R2 different from the curvature R1
- 6 is a temperature control element for controlling the temperature of the wavelength conversion element 3.
- Reference numeral 7 denotes an element fixing base for fixing the wavelength conversion element 3
- 18 denotes a fundamental wave absorber (an example of a fundamental wave shield) that serves as a fundamental laser shield.
- a temperature control unit 8 is composed of the temperature control element 6 and the element fixing base 7, and the temperature control unit 8 is arranged so that one main surface is in contact with one main surface of the wavelength conversion element 3.
- the fundamental wave absorption unit 18 is disposed between the first concave mirror 4 and the temperature control unit 8, and prevents the fundamental wave that cannot enter the wavelength conversion element 3 from being absorbed by the temperature control unit 8.
- the light quantity of the fundamental wave absorbed by the temperature control unit 8 is reduced.
- the upper surface of the fundamental wave absorber 18 is formed on the first concave mirror without shielding the fundamental wave and the second harmonic wave incident on the first concave mirror 4 from the wavelength conversion element 3.
- 4 is preferably installed at a position where the fundamental wave reflected by 4 is shielded, for example, at the height of the contact surface between the wavelength conversion element 3 and the element fixing base 7.
- FIG.1 and FIG.2 shows the central axis which is an axis which passes along the center of the 1st concave mirror 4, the 2nd concave mirror 5, and the wavelength conversion element 3, and the broken line shown by 12 is fundamental.
- 2 schematically shows an optical path of a wave laser beam and a condensing state in an optical system constituting a wavelength conversion laser device in the present embodiment.
- a fiber laser light source is used as the fundamental wave laser light source 1, and the condensing optical system 2 is composed of a collimator lens and a plano-convex lens.
- the wavelength conversion element 3 is made of MgO: LiNbO 3 crystal (PPLN) having a periodic domain-inverted structure.
- the wavelength conversion element 3 has a length (length in the direction of the central axis 9) of 26 mm, a width (length in the direction of arrow 10) of 10 mm, and a thickness (length in the direction of arrow 11) of 0.5 mm.
- the first concave mirror 4 is provided with a coating that has a high fundamental wave reflectivity and a high second harmonic transmittance, and the second concave mirror 5 has a fundamental wave and a second harmonic wave. It has a coating that increases both reflectivity.
- the first concave mirror 4 and the second concave mirror 5 are disposed so that the concave portions face each other, and the wavelength conversion element 3 is disposed between the two concave mirrors 4 and 5.
- FIG. 3 is a front view of the second concave mirror 5 viewed from the direction of the central axis 9.
- the first concave mirror 4 is circular, as shown in FIG. 3, the second concave mirror 5 is cut from the circular concave mirror at its lower part (area indicated by a broken line in the figure), and the fundamental laser beam source 1 has a notch area CA for allowing the fundamental wave generated from 1 to enter the wavelength conversion element 3.
- the shape of the cutout area CA is not particularly limited to the above example, and other shapes may be used as long as the fundamental wave generated from the fundamental wave laser light source 1 can be incident on the wavelength conversion element 3. .
- a temperature control unit 8 is constituted by the temperature control element 6 and an element fixing base 7 made of copper having a high thermal conductivity, and the element fixing base 7 and the wavelength conversion element 3 have high heat dissipation and thermal conductivity. Fixed and in contact with adhesive.
- a Peltier element is used as the temperature control element 6, and the temperature control element 6 is set so that the temperature of the Peltier element, that is, the wavelength conversion element 3 becomes a predetermined temperature by using a control circuit (not shown). I have control.
- the fundamental wave absorber 18 serving as a fundamental wave laser shading part for example, a colored glass filter that absorbs fundamental waves is used, and is disposed between the temperature controller 8 and the first concave mirror 4.
- the colored glass filter for example, when the wavelength of the fundamental wave is 1064 nm, a rectangular absorption filter that absorbs 99% or more of light in the frequency band of 1064 ⁇ 1 nm can be used.
- the shape of the fundamental wave absorber 18 is not particularly limited to the above example, and other shapes may be used as long as unnecessary fundamental waves can be absorbed.
- a fundamental wave oscillated from the fundamental wave laser light source 1 (hereinafter also referred to as a fundamental wave laser beam) is condensed by the condensing optical system 2.
- a part of the second concave mirror 5 is cut, and from the notch area CA, that is, the area where the second concave mirror 5 is not provided, in parallel with the central axis 9, The fundamental wave is incident on the wavelength conversion element 3.
- the two concave mirrors 4 and 5 are arranged at intervals that are not confocal, and by using the concave mirrors 4 and 5 having different focal lengths, the fundamental wave reflects between the concave mirrors 4 and 5.
- a mechanism is provided in which a plurality of condensing points can be provided in the wavelength conversion element 3.
- the concave mirrors 4 and 5 By disposing the concave mirrors 4 and 5 at an interval that does not result in confocal arrangement, it is possible to prevent the condensing points from concentrating on one point in the wavelength conversion element 3, and to prevent the wavelength conversion element 3 from being destroyed or locally generating heat. Can do.
- the fundamental wave reciprocates between the concave mirrors 4 and 5 and repeats passing through the wavelength conversion element 3 ten times or more.
- the curvatures R1 and R2 of the two concave mirrors 4 and 5 are set to satisfy R1> R2. That is, the focal lengths f1 and f2 of the two concave mirrors 4 and 5 are set to satisfy f1> f2. Accordingly, for example, in FIG. 1, the fundamental wave traveling from the second concave mirror 5 toward the first concave mirror 4 is collected, and the fundamental returns from the first concave mirror 4 to the second concave mirror 5. The wave becomes substantially parallel light.
- the optical path of the fundamental wave from one concave mirror to the other concave mirror is defined as one optical path, and the path through which the fundamental wave passes through the wavelength conversion element 3 for the nth time is defined as the nth path. Therefore, the fundamental wave is condensed by the condensing optical system 2 and a part of the fundamental wave incident on the wavelength conversion element 3 is converted into the second harmonic, and the remaining fundamental wave that has not been wavelength-converted and the wavelength conversion Together with the generated second harmonic wave, it reaches the first concave mirror 4 (first path).
- the fundamental wave that has not been wavelength-converted is reflected by the first concave mirror 4, and the second harmonic is transmitted through the first concave mirror 4 and output to the outside.
- the fundamental wave reflected by the first concave mirror 4 enters the wavelength conversion element 3 again, is partially converted into the second harmonic, and reaches the second concave mirror 5 (second path).
- the wavelength conversion element 3 is repeatedly passed to generate the second harmonic. Since the first concave mirror 4 is coated to increase the transmittance with respect to the second harmonic, the generated second harmonic is output to the outside from the first concave mirror 4 side. At this time, the temperature of the wavelength conversion element 3 is controlled by the temperature control unit 8 so that the second harmonic output is maximized.
- the wavelength conversion efficiency can be improved as compared with a conventional wavelength conversion laser light source that passes through the wavelength conversion element 3 only once.
- the fundamental wave is condensed in the wavelength conversion element 3 during a pass from the direction of the second concave mirror 5 to the direction of the first concave mirror 4 (odd-numbered pass).
- the fundamental wave at the time of the path from the first concave mirror 4 to the second concave mirror 5 (at the time of the even-numbered pass) becomes substantially parallel light, and the wavelength conversion from the fundamental wave to the second harmonic is Compared with the odd-numbered path, it is negligibly small.
- the wavelength conversion efficiency from the fundamental wave to the second harmonic can be doubled compared to the conventional wavelength conversion laser light source that passes through the wavelength conversion element 3 only once.
- the angle at which the fundamental wave enters the wavelength conversion element 3 changes for each passing path, and the phase matching condition is set according to the incident angle of the fundamental wave in each path.
- Phase matching conditions such as the wavelength of the fundamental wave to be satisfied and the refractive index (temperature) of the nonlinear optical material (wavelength conversion element 3) are different.
- the temperature of the wavelength conversion element 3 that satisfies the phase matching condition differs for each path. Even if it deviates, it is in agreement with the phase matching conditions of other paths, and there is an effect of suppressing a decrease in wavelength conversion efficiency.
- the allowable temperature range (full width at half maximum) is 1.1 degrees, but the allowable temperature range (full width at half maximum) of the present embodiment is 2.6 degrees. It was possible to have a temperature tolerance width that is at least twice that of the above.
- FIG. 4 shows the position where the fundamental wave enters the wavelength conversion element 3 in each path when the focal length f1 of the first concave mirror 4 is set to 25 mm and the focal length f2 of the second concave mirror 5 is set to 20 mm.
- FIG. 5 is a diagram showing the beam diameter of the fundamental wave at a position where the fundamental wave is incident on the wavelength conversion element 3 (for example, the position shown in FIG. 4) in each path.
- FIG. 6 shows the fundamental wave of each path at the center position of the wavelength conversion element 3 when the focal length f1 of the first concave mirror 4 is set to 25 mm and the focal length f2 of the second concave mirror 5 is set to 20 mm.
- FIG. 7 is a diagram showing the diameter of the fundamental wave beam at the center position of the wavelength conversion element 3 (for example, the position shown in FIG. 6) in each path. 5 and 7, the horizontal axis represents the number of paths, and the vertical axis represents the diameter (mm) of the fundamental wave beam.
- the diameter of the fundamental wave beam exceeds the thickness of 0.5 mm of the wavelength conversion element 3 during reciprocation between the concave mirrors 4 and 5 (shown above the dotted line in FIG. 5). It can be seen that some of the waves are not incident on the wavelength conversion element 3. Further, as shown in FIG. 7, the condensing optical system 2 is selected so that the diameter of the fundamental wave beam becomes the optimum condensing beam diameter in the first pass. As described above, it can be seen that when the odd-numbered group OG passes, the wavelength conversion element 3 has a condensing point, while when the even-numbered group EG passes, it does not have a condensing point.
- the fundamental wave absorber 18 is desirable to dispose the fundamental wave absorber 18 at least between the first concave mirror 4 and the temperature controller 8. The reason will be described below.
- the beam diameter of the fundamental wave exceeds the thickness of the wavelength conversion element 3 (for example, the eighth path in FIG. 5).
- the fundamental wave is irradiated to the element fixing base 7 and the amount of light absorbed is increased
- the fundamental wave is reflected by the second concave mirror 5 and is incident on the wavelength conversion element 3. This is because, in the path, the beam diameter at the position incident on the wavelength conversion element 3 is smaller than that of the even-numbered path, and the light amount of the fundamental wave irradiated to the element fixing base 7 and absorbed is small.
- the fundamental wave absorber 18 is provided between the first concave mirror 4 and the temperature controller 8.
- the temperature change of the element fixing base 7 can be effectively suppressed, and as a result, the second harmonic output becomes a stable light source.
- the fundamental wave absorber 18 by disposing the fundamental wave absorber 18 between the temperature control element 6 and the first concave mirror 4, an unnecessary fundamental wave that is not wavelength-converted by the fundamental wave absorber 18 is generated. Absorbs and prevents the fundamental wave from being absorbed by the temperature controller 8. By this action, the temperature increase of the wavelength conversion element 3 due to the fundamental wave that is not wavelength-converted can be prevented, and the decrease in the second harmonic output can be reduced.
- a fundamental wave absorber may also be provided between the second concave mirror 5 and the temperature controller 8, and in that case, a light source with a more stable output can be provided.
- FIG. 8 shows a configuration in which the fundamental wave absorber 18 is omitted (for example, the configuration shown in FIG. 4), and the wavelength conversion laser light source is operated under constant current control, so that the second harmonic output becomes approximately 6 W.
- FIG. 9 is a diagram showing a time change of the second harmonic output when adjusted as described above, and FIG. 9 is a diagram showing a second example in which the wavelength conversion laser light source is operated under constant current control using the configuration of the present embodiment. It is a figure which shows the time change of a 2nd harmonic output when adjusting so that a harmonic output may be set to about 6W. 8 and 9, the horizontal axis represents time (s), and the vertical axis represents the normalized value of the second harmonic output.
- the temperature of the wavelength conversion element 3 is controlled by the temperature control unit 8, but as shown in FIG. If the continuous operation is performed for more than one minute, the temperature control unit 8 cannot sufficiently control the temperature of the wavelength conversion element 3, and the temperature control unit 8 absorbs an unnecessary fundamental wave and the temperature of the wavelength conversion element 3 is increased.
- the second harmonic output fluctuates by 40% at maximum.
- the fundamental wave absorber 18 absorbs an unnecessary fundamental wave and prevents the temperature conversion of the wavelength conversion element 3 due to the unnecessary fundamental wave. Therefore, the fluctuation of the second harmonic output can be suppressed to 3% or less, and a high-output and highly stable wavelength conversion laser light source can be obtained.
- the fundamental wave absorption unit 18 may include a heat dissipation mechanism that radiates heat to the outside without transferring the heat generated by the absorbed fundamental wave to the temperature control unit 8.
- FIG. 10 is a diagram showing an example in which a heat dissipation mechanism is added to the wavelength conversion laser light source shown in FIG.
- the fundamental wave absorption unit 18 is fixed to the heat dissipation mechanism 19 with an adhesive having high heat dissipation and thermal conductivity
- the heat dissipation mechanism 19 includes a fixing unit 19 a joined to the fundamental wave absorption unit 18.
- the plurality of fins 19b for radiating the heat transmitted from the fixed portion 19a to the outside are provided, and the fixed portion 19a and the plurality of fins 19b are integrally formed.
- a metal having high thermal conductivity can be used, and for example, copper, silver, aluminum, or the like can be used. Moreover, you may make the fundamental wave absorption part 18 contact the thermal radiation mechanism 19 using grease. By using grease, heat dissipation and thermal conductivity can be further improved.
- the heat dissipation mechanism 19 is not particularly limited to the above example, and various shapes and structures can be used as long as the heat absorbed by the fundamental wave absorption unit 18 can be radiated to the outside without being transmitted to the temperature control unit 8. For example, a flat metal having high thermal conductivity may be used.
- the heat generated by the fundamental wave absorption unit 18 absorbing the fundamental wave is transmitted to the fixing unit 19a of the heat dissipation mechanism 19 and further to the plurality of fins 19b.
- heat generated by absorbing the fundamental wave is efficiently radiated to the outside without being transmitted to the temperature control unit 8.
- the fundamental wave absorbing unit 18 (or the heat dissipation mechanism 19) and the temperature control unit 8 are separated from each other by a predetermined distance or a heat insulating material is sandwiched between the fundamental wave absorbing unit 18 and The temperature controller 8 is thermally separated so that the thermal resistance between the fundamental wave absorber 18 and the temperature controller 8 is increased.
- a light source can be provided.
- a fiber laser light source is used as the fundamental laser light source 1 of the first embodiment.
- a fundamental wave with high beam quality transverse mode
- the fundamental wave with high beam quality can increase the wavelength conversion efficiency when passing through the wavelength conversion element 3 once.
- the total wavelength conversion efficiency when passing through the wavelength conversion element 3 a plurality of times can be improved.
- the fundamental laser light source 1 various laser light sources such as a semiconductor laser light source and a solid-state laser light source may be used in addition to the fiber laser light source.
- a semiconductor laser light source or a solid-state laser light source the fundamental laser light source can be reduced in size, and the entire wavelength conversion laser can be reduced in size.
- a collimator lens and a plano-convex lens are used, but wavelength conversion is performed using at least one of various lenses such as a collimator lens, a plano-convex lens, a convex lens, a plano-concave lens, a concave lens, and an aspheric lens.
- the light may be condensed in the element 3.
- the focal length can be shortened, and the wavelength conversion laser light source can be reduced in size.
- the diameter of the fundamental wave beam is adjusted to the optimum focused beam diameter by the focusing optical system 2 so that the second harmonic output from the first path is increased. You may make it the diameter of the beam of the fundamental wave after the 3rd pass become an optimal condensing beam diameter. In this case, the spread of the diameter of the fundamental wave beam can be suppressed, the amount of heat absorbed by the fundamental wave absorber 18 can be reduced, and the heat dissipation mechanism provided in the fundamental wave absorber 18 can be made simpler. Can do.
- the fundamental wave is parallel to the central axis 9 from a region where the second concave mirror 5 is not present (a part of the second concave mirror 5 is cut in the present embodiment).
- the fundamental wave is incident on the wavelength conversion element 3, but the coating does not reflect the fundamental wave to a partial region of the second concave mirror 5 without cutting a part of the second concave mirror 5. May be provided.
- PPLN having a thickness of 0.5 mm is used for the wavelength conversion element 3, but PPLN thicker than 0.9 mm may be used.
- the amount of heat absorbed by the fundamental wave absorber 18 can be reduced to 50% or less, and the heat dissipation mechanism provided in the fundamental wave absorber 18 can be made simpler.
- the fundamental wave component that can be incident on the wavelength conversion element 3 is increased, and the wavelength conversion efficiency is improved, so that driving with low power is possible. .
- a PPLN having a length of 26 mm is used for the wavelength conversion element 3, but a PPLN shorter than 26 mm may be used.
- the allowable temperature range can be further increased.
- PPLN is used for the wavelength conversion element 3
- various nonlinear optical materials may be used.
- lithium triborate crystal (LiB 3 O 5 : LBO), potassium titanyl phosphate (KTiOPO 4 : KTP) crystal, and LiTaO 3 crystal (PPLT) having a periodic domain-inverted structure are used.
- PPLN and PPLT can satisfy the phase matching condition at an arbitrary fundamental wave wavelength by changing the period of the periodically poled structure. Therefore, a wavelength conversion laser light source having an arbitrary second harmonic wavelength can be realized.
- PPLN has a high second-order nonlinear constant
- high wavelength conversion efficiency can be obtained even when the fundamental wave input is 20 W or less, and driving with low power is possible.
- PPLT has a low fundamental wave light absorption factor and a second harmonic light absorption factor, and can obtain a more stable output when a fundamental wave of 20 W or more is input.
- LBO is excellent in high output tolerance, it can obtain high wavelength conversion efficiency in a wavelength conversion laser light source that inputs a high peak pulse with a fundamental wave input of 100 W or more, and a high peak output wavelength conversion laser light source can be obtained. Can be provided.
- a Peltier element is used as the temperature control element 6, but a heater may be used instead of the Peltier element.
- the heater is used, the time for raising the wavelength conversion element 3 from the low temperature side to the phase matching temperature can be shortened by rapid heating, so that the startup time of the wavelength conversion laser light source can be shortened.
- the element fixing base 7 Although copper having high thermal conductivity is used for the element fixing base 7, silver, aluminum or the like may be used. By using silver having higher thermal conductivity for the element fixing base 7 than copper, the temperature controllability of the wavelength conversion element 3 can be improved, and the second harmonic output can be obtained more stably. .
- copper having high thermal conductivity may be disposed on the wavelength conversion element 3.
- a metal having high thermal conductivity also on the upper part the temperature of the wavelength conversion element 3 can be made more uniform, high wavelength conversion efficiency can be obtained, and driving with low power becomes possible.
- copper having a high thermal conductivity disposed at the upper portion is used as an element fixing base, and a temperature control element is adhered to the element fixing base, thereby providing a temperature control section on the upper portion of the wavelength converting element 3 to convert the wavelength. You may make it control the temperature of an element.
- a fundamental wave absorber may be disposed between the temperature controller and the first concave mirror 4.
- the element fixing base 7 and the wavelength conversion element 3 are fixed and contacted with an adhesive having high heat dissipation and thermal conductivity, they may be contacted using grease. By using grease, heat dissipation and thermal conductivity can be further improved, and the second harmonic output can be obtained more stably.
- the fundamental wave absorber 18 may be integrated with the temperature controller 8 with a heat insulating material interposed therebetween. In this case, the position adjustment of the fundamental wave absorber 18 can be simplified, and the cost for adjusting the position of the fundamental wave absorber 18 can be reduced.
- a colored glass filter that absorbs the fundamental wave is disposed as the fundamental wave absorbing unit 18 between the temperature control unit 8 and the first concave mirror 4, but an aperture that blocks or absorbs the fundamental wave is disposed.
- May be. 11 is a top view of the configuration of a wavelength conversion laser light source using an aperture instead of the fundamental wave absorber in the wavelength conversion laser light source shown in FIG. 1, and
- FIG. 12 is a diagram of the wavelength conversion laser light source shown in FIG. It is the figure which looked at the structure from the side.
- the aperture 48 is an aperture in which a rectangular opening is provided at the inner center portion of a rectangular substrate, and the shape of the opening is the first concave mirror 4 of the wavelength conversion element 3.
- the size of the opening is set to be equal to or smaller than the size of the end surface of the wavelength conversion element 3 on the first concave mirror 4 side.
- the aperture 48 is disposed between the first concave mirror 4 and the temperature control unit 8, passes the fundamental wave from the opening, enters the wavelength conversion element 3, and enters the wavelength conversion element 3. Since the fundamental wave that cannot be absorbed is shielded, the fundamental wave that cannot enter the wavelength conversion element 3 is prevented from being absorbed by the temperature controller 8, and the light quantity of the fundamental wave absorbed by the temperature controller 8 is reduced.
- the fundamental wave that is not incident on the wavelength conversion element 3 can be blocked by the aperture 48. Therefore, it is possible to prevent the fundamental wave from being absorbed by the temperature control unit 8 and to stabilize the output intensity of the second harmonic.
- the shape of the aperture is not particularly limited to the above example. If the fundamental wave that cannot be incident on the wavelength conversion element 3 can be prevented from being absorbed by the temperature control unit 8, the aperture has a rectangular shape. It is also possible to use an aperture provided with an opening, or arrange two apertures on the top and bottom and provide an opening between them.
- a mirror that reflects the fundamental wave (hereinafter referred to as a fundamental wave reflection mirror) may be disposed.
- the fundamental wave reflecting mirror does not absorb the fundamental wave, and therefore does not generate heat. Therefore, the heat dissipation mechanism can be omitted, and the cost of the heat dissipation mechanism can be reduced.
- the fundamental wave reflecting mirror by arranging the fundamental wave reflecting mirror to be inclined in the thickness direction of the wavelength conversion element 3 with respect to the optical axis of the fundamental wave, the fundamental wave once reflected by the fundamental wave reflecting mirror is combined with the first concave mirror 4 and the first concave mirror 4.
- the light can be emitted from between the two concave mirrors 4 and 5 to the outside without being reflected by the two concave mirrors 5.
- the fundamental wave that is not incident on the wavelength conversion element 3 is prevented from being absorbed by the temperature control unit 8, and an effect of reducing the output fluctuation of the second harmonic is obtained. be able to.
- FIG. 13 is a top view of the configuration of a wavelength conversion laser light source using a fundamental wave reflection mirror in place of the fundamental wave absorber in the wavelength conversion laser light source shown in FIG. 1, and FIG. 14 is a wavelength conversion shown in FIG. It is the figure which looked at the structure of the laser light source from the side.
- the fundamental wave reflection mirror 58 is not perpendicular or parallel to the fundamental wave optical path between the first concave mirror 4 and the temperature control unit 8, and the fundamental wave light.
- the fundamental wave which is disposed inclining in the thickness direction of the wavelength conversion element 3 with respect to the axis and cannot enter the wavelength conversion element 3, is prevented from being absorbed by the temperature control unit 8 and absorbed by the temperature control unit 8. Reduce the amount of fundamental wave.
- the thickness of the wavelength conversion element 3 is T
- the diameter (length in the element thickness direction) of the first concave mirror 4 is r 1
- the angle ⁇ 1 formed by the optical axis of the fundamental wave incident on the fundamental wave reflection mirror 58 and the reflection surface of the fundamental wave reflection mirror 58 is (r 1 ⁇ T) / It is desirable to satisfy 2> d 1 ⁇ tan ( ⁇ 2 ⁇ 1 ).
- the fundamental wave reflected by the fundamental wave reflection mirror 58 is emitted to the outside without being reflected by the first concave mirror 4 again.
- the influence on the temperature of the wavelength conversion element 3 can be eliminated.
- the fundamental wave is condensed in the wavelength conversion element 3 during the odd-numbered path.
- the even-numbered path is different from the odd-numbered path in that the angle at which the fundamental wave is incident on the wavelength conversion element 3 is greatly different in each path. Therefore, the temperature of the wavelength conversion element 3 satisfying the phase matching condition is different for each path. Since the allowable temperature range can be further increased, it is possible to provide a wavelength conversion laser capable of obtaining a more stable output.
- the diameter of the fundamental wave beam exceeds the thickness of the wavelength conversion element 3.
- the amount absorbed by being absorbed by the fixed base 7 increases. Therefore, for example, by arranging the fundamental wave absorber 18 or the aperture 48 between the second concave mirror 5 and the temperature controller 8 as the fundamental laser light shielding part, the temperature change of the element fixing base 7 can be effectively performed. Therefore, the second harmonic output becomes a stable light source.
- a fundamental wave absorber may be disposed between the first concave mirror 4 and the temperature controller 8.
- the fundamental wave reflection mirror 58 may be disposed between the second concave mirror 5 and the temperature control unit 8 as the fundamental wave laser shielding unit.
- the thickness of the wavelength conversion element 3 is T
- the diameter of the second concave mirror 5 (length in the element thickness direction) is r 2
- the fundamental wave reflected by the fundamental wave reflection mirror 58 is emitted to the outside without being reflected by the second concave mirror 5 again.
- the influence on the temperature of the wavelength conversion element 3 can be eliminated.
- FIG. 15 and 16 are diagrams showing an example of the configuration of the wavelength conversion laser light source according to the second embodiment of the present invention
- FIG. 15 is a diagram of the configuration of the wavelength conversion laser light source according to the present embodiment as viewed from above.
- FIG. 16 is a side view of the configuration of the wavelength conversion laser light source shown in FIG. In the following, the directions indicated by the arrow 10 in FIG. 15 and the arrow 11 in FIG. 16 are the element width direction and the element thickness direction, respectively.
- 1 is a fundamental laser light source for generating a fundamental wave
- 2 is a condensing optical system for condensing the fundamental wave
- 3 is for converting the fundamental wave into a second harmonic.
- 4 is a first concave mirror having a curvature R1
- 5 is a second concave mirror having a curvature R2 different from the curvature R1
- 6 is a temperature control element for controlling the temperature of the wavelength conversion element 3.
- Reference numeral 67 denotes an element fixing base for fixing the wavelength conversion element 3
- the temperature control unit 68 includes the temperature control element 6 and the element fixing base 67.
- FIG.15 and FIG.16 shows the central axis which is an axis which passes along the center of the 1st concave mirror 4, the 2nd concave mirror 5, and the wavelength conversion element 3, and the broken line shown by 12 is fundamental.
- 1 schematically shows an optical path of a wave laser beam and a condensing state in an optical system constituting a wavelength conversion laser in the present embodiment.
- the wavelength conversion laser light source shown in the present embodiment is different from the wavelength conversion laser light source shown in the first embodiment in that the fundamental wave absorption unit 18 is omitted, and instead, the end surface of the element fixing base 67 is a reflection end surface RP,
- the fundamental laser beam is reflected in a desired direction (for example, outside the wavelength conversion laser light source) by the shape of the element fixing base 67.
- the end face of the element fixing base 67 for equalizing the temperature of the wavelength conversion element 3 is processed to an angle that is not orthogonal to the incident angle of the fundamental wave.
- the reflection end face RP is formed.
- the thickness of the wavelength conversion element 3 is T
- the diameter of the first concave mirror 4 (length in the element thickness direction)
- the first concave mirror 4 and the first concave mirror 4 side Assuming that the distance from the end face of the wavelength conversion element 3 is d 1 , the angle ⁇ 1 formed by the optical axis of the fundamental wave incident on the reflection end face RP of the element fixing base 67 and the reflection end face RP of the element fixing base 67 is (r 1 ⁇ T) / 2> d 1 ⁇ tan ( ⁇ 2 ⁇ 1 ) is satisfied.
- the light reflected by the reflection end surface RP of the element fixing base 67 is not reflected by the first concave mirror 4 again, but is reflected by the pair of concave mirrors (first concave mirror) that reflects the fundamental wave. 4 and the second concave mirror 5).
- the fundamental laser beam is prevented from being repeatedly reflected between the element fixing base 67 and the concave mirror pair, thereby reducing the amount of absorption of the fundamental laser light at the element fixing base 67. The effect of being able to be obtained.
- the absorption at the time of reflection can be further reduced by attaching a coating that reflects light of the fundamental wave well or a mirror that reflects the fundamental wave to the end face of the element fixing base 67, so that the higher power Even when the fundamental wave is irradiated, the fluctuation of the second harmonic output can be reduced.
- the colored glass filter, the diffuser, and the like are provided with a heat radiation mechanism independently of the temperature control element 6, thereby eliminating the influence on the temperature of the wavelength conversion element 3 and obtaining a stable output.
- the end face of the element fixing base 67 on the second concave mirror 5 side may be processed to an angle not orthogonal to the incident angle of the fundamental wave to form a reflection end face.
- the thickness of the wavelength conversion element 3 is T
- the diameter of the second concave mirror 5 is r 2
- the wavelength conversion on the second concave mirror 5 and the second concave mirror 5 side is performed.
- the angle ⁇ 2 formed with the reflection end face preferably satisfies (r 2 ⁇ T) / 2> d 2 ⁇ tan ( ⁇ 2 ⁇ 2 ).
- the same effect as that of the reflection end surface RP of the element fixing base 67 can be obtained.
- the fundamental wave laser light reflected by the end surface of the element fixing base 67 on the second concave mirror 5 side is absorbed or scattered, and thus the wavelength conversion element 3 is obtained.
- the reflection end face is formed only on the end face of the element fixing base 67.
- the present invention is not particularly limited to this example.
- a reflection end face is also formed on the end face of the temperature control element 6, or the temperature control element 6 Various modifications, such as forming a reflection end face only on the end face, are possible.
- FIG. 17 and 18 are diagrams schematically illustrating an example of the configuration of the wavelength conversion laser light source according to the third embodiment of the present invention.
- FIG. 17 illustrates the configuration of the wavelength conversion laser light source according to the present embodiment from above.
- FIG. 18 is a side view of the configuration of the wavelength conversion laser light source shown in FIG. In the following, the directions indicated by the arrow 10 in FIG. 17 and the arrow 11 in FIG. 18 are the element width direction and the element thickness direction, respectively.
- 1 is a fundamental laser light source for generating a fundamental wave
- 2 is a condensing optical system for condensing the fundamental wave
- 3 is for converting the fundamental wave into a second harmonic.
- 74 is a first concave mirror having a curvature R1
- 5 is a second concave mirror having a curvature R2 different from the curvature R1
- 6 is a temperature control element for controlling the temperature of the wavelength conversion element 3.
- Reference numeral 7 denotes an element fixing base for fixing the wavelength conversion element 3
- the temperature control unit 8 includes the temperature control element 6 and the element fixing base 7.
- FIG.17 and FIG.18 shows the central axis which is an axis which passes along the center of the 1st concave mirror 74, the 2nd concave mirror 5, and the wavelength conversion element 3, and the broken line shown by 12 is fundamental.
- 1 schematically shows an optical path of a wave laser beam and a condensing state in an optical system constituting a wavelength conversion laser in the present embodiment.
- the wavelength conversion laser light source shown in the present embodiment is different from the wavelength conversion laser light source shown in Embodiment 1 in that the fundamental wave absorption unit 18 is omitted and the first concave mirror 74 is vertically moved (element thickness direction).
- a desired portion is processed by cutting or the like, for example, so as to be smaller than the thickness of the wavelength conversion element 3.
- the first concave mirror 74 is processed by cutting a desired portion in the vertical direction (element thickness direction), for example, by cutting or the like, so that the first concave mirror 74 is positioned above and below the thickness of the wavelength conversion element 3.
- the width is made smaller.
- the reflection area in the element thickness direction of the first concave mirror 74 is set so that the fundamental laser beam reflected by the first concave mirror 74 is entirely incident on the wavelength conversion element 3.
- the upper and lower parts of the circular first concave mirror 74 are cut so that the thickness of the first concave mirror 74 is 0.5 mm, which is the same as the thickness of the wavelength conversion element 3.
- the beam diameter of the fundamental laser beam reflected by the first concave mirror 74 on the surface of the first concave mirror 74 is equal to or less than the thickness of the wavelength conversion element 3 (0.5 mm in the present embodiment). Therefore, the fundamental laser beam reflected by the first concave mirror 74 always passes through the wavelength conversion element 3 and is wavelength-converted from the fundamental laser beam to the second harmonic.
- the fundamental laser beam reflected by the first concave mirror 74 is not irradiated to the element fixing base 7 or the temperature control element 6 (that is, the fundamental wave that cannot enter the wavelength conversion element 3). Since the laser light is not reflected by the first concave mirror 74), in principle, the temperature control unit 8 does not cause a temperature change due to absorption of the fundamental wave, and prevents the wavelength conversion element 3 from rising in temperature. And the fluctuation of the second harmonic output can be reduced.
- the upper and lower sides (element thickness direction) of the second concave mirror 5 are shaped by cutting or the like, and all the fundamental laser light reflected by the second concave mirror 5 is incident on the wavelength conversion element 3. Thus, the same effect can be obtained. Further, by processing the shape and size in the element thickness direction of both the first concave mirror 74 and the second concave mirror 5 into a desired shape and size, the thickness direction of the wavelength conversion element 3 of the entire apparatus is processed. There is an advantage that the size of the can be reduced.
- the fundamental wave is formed on the outer peripheral portion of the first concave mirror 74 corresponding to the cut portion. Even if a member made of a material that does not reflect light, such as an absorbing member that absorbs the fundamental wave or a transmissive member that transmits the fundamental wave and emits it to the outside, the fundamental wave irradiated to the element fixing base 7 and the temperature control element 6 is used. Laser light can be eliminated, and temperature fluctuations of the wavelength conversion element 3 can be reduced.
- first concave mirror 74 for example, an in-plane region of 0.25 mm or more in the vertical direction in the element thickness direction from the center of the first concave mirror 74
- antireflection coating for the fundamental wave Similar effects can be obtained.
- the fundamental laser beam emitted to the outside without being reflected by the first concave mirror 74 and / or the second concave mirror 5 is, for example, an absorber attached to a metal having high thermal conductivity, By processing using the beam diffuser, it is possible to eliminate the influence on the temperature fluctuation of the wavelength conversion element 3.
- FIG. 19 and 20 are diagrams showing an example of the configuration of the wavelength conversion laser light source according to the fourth embodiment of the present invention
- FIG. 19 is a diagram of the configuration of the wavelength conversion laser light source according to the present embodiment as viewed from above.
- FIG. 20 is a side view of the configuration of the wavelength conversion laser light source shown in FIG.
- the directions indicated by the arrow 10 in FIG. 19 and the arrow 11 in FIG. 20 are the element width direction and the element thickness direction, respectively.
- 1 is a fundamental laser light source for generating a fundamental wave
- 2 is a condensing optical system for condensing the fundamental wave
- 3 is for converting the fundamental wave into a second harmonic.
- 4 is a first concave mirror having a curvature R1
- 51 is a second mirror composed of a cylindrical mirror having a curvature R2 different from the curvature R1 only in one direction (element width direction)
- 6 is a wavelength conversion element.
- 3 is a temperature control element for controlling the temperature
- 7 is an element fixing base for fixing the wavelength conversion element 3
- the temperature control unit 8 is composed of the temperature control element 6 and the element fixing base 7.
- 19 and 20 indicates a central axis that is an axis passing through the centers of the first concave mirror 4, the second mirror 51, and the wavelength conversion element 3, and a broken line indicated by 12 indicates a fundamental wave.
- the optical path of a laser beam and the condensing state in the optical system which comprises a wavelength conversion laser in this Embodiment are shown typically.
- the wavelength conversion laser light source shown in the present embodiment is different from the wavelength conversion laser light source shown in Embodiment 1 in that the fundamental wave absorption unit 18 is omitted and the second mirror 51 is used instead of the second concave mirror 5.
- the spread of the fundamental beam diameter in the vertical direction (element thickness direction) is suppressed.
- the light quantity of the fundamental wave that is irradiated and absorbed by the element fixing base 7 can be reduced and the temperature increase of the wavelength conversion element 3 can be prevented, so that the wavelength conversion laser output can be stabilized.
- the wavelength conversion element 3 is made of MgO: LiNbO 3 (length: 26 mm, width: 10 mm, thickness: 0.5 mm) having a periodic domain-inverted structure.
- the fundamental wave reflected by the first concave mirror 4 and the second mirror 51 and repeatedly incident on the wavelength conversion element 3 is shifted in the focusing position in the element width direction and the element thickness direction. Therefore, the beam shape is an elliptical beam.
- the light reflected by the first concave mirror 4 becomes substantially parallel light, and the light reflected by the second mirror 51 is condensed in the element. Therefore, the relationship between the beam diameter of the fundamental wave laser beam and the number of passes in the element width direction is as shown in FIG.
- FIG. 21 is a diagram showing the diameter of the fundamental wave beam in the element thickness direction on the incident end face (for example, the position shown in FIG. 4) of the wavelength conversion element 3 in each path.
- the horizontal axis indicates the number of paths
- the vertical axis indicates the diameter (mm) of the fundamental wave beam.
- the reflection of the fundamental wave in the element thickness direction is reflected by the plane mirror, so that the beam reflected by the second mirror 51 and incident on the wavelength conversion element 3 Becomes a convergent beam, and the diameter of the fundamental wave beam in the element thickness direction at the end face of the wavelength conversion element 3 is always 0.5 mm or less.
- the diameter of the fundamental wave beam does not become larger than the thickness of the wavelength conversion element 3, and the fundamental wave is always incident on the wavelength conversion element 3, so that the temperature control element 6 and the element fixing base 7 are irradiated. This prevents the temperature control element 6 and the element fixing base 7 from absorbing the fundamental laser beam and generating heat.
- the temperature increase of the wavelength conversion element 3 can be prevented, and the output fluctuation of the second harmonic can be suppressed to within 3%. Also, with this configuration, since the condensing position in the element width direction and the condensing position in the element thickness direction are shifted, the optical density of the fundamental laser beam inside the wavelength conversion element 3 can be reduced, and the wavelength conversion element 3 The absorption of the fundamental wave and the second harmonic due to can be reduced. Furthermore, according to this configuration, it is not necessary to align the second mirror 51 in the element thickness direction, and the assembly adjustment process can be simplified.
- FIG. 22 shows a configuration of a liquid crystal display device using a backlight illumination device including any one of the wavelength conversion laser light sources shown in the first to fourth embodiments as an example of the image display device.
- FIG. 22 shows a configuration of a liquid crystal display device using a backlight illumination device including any one of the wavelength conversion laser light sources shown in the first to fourth embodiments as an example of the image display device.
- 101 is a backlight illumination device
- 102 is a laser light source
- 103 is an optical fiber
- 104 is a light guide
- 105 is a light guide plate
- 107 is a liquid crystal display panel which is a spatial modulation element
- 108 is a polarizing plate
- 109 is A liquid crystal plate is shown.
- the laser light source 102 included in the backlight illumination device 101 includes a red laser light source 102a (hereinafter referred to as R light source), a green laser light source 102b (hereinafter referred to as G light source), and a blue laser light source 102c ( Hereinafter, it is expressed as B light source).
- R light source red laser light source
- G light source green laser light source
- B light source blue laser light source
- the G light source 102b is the wavelength conversion laser light source shown in any one of the first to fourth embodiments of the present invention.
- a semiconductor laser made of an AlGaInP / GaAs material with a wavelength of 640 nm is used for the R light source 102a, and a semiconductor laser made of a GaN material with a wavelength of 450 nm is used for the B light source 102c.
- the backlight illumination device 101 includes a laser light source 102, an optical fiber 103 that guides red laser light, green laser light, and blue laser light from the laser light source 102 to the light guide plate 105 through the light guide unit 104, and the introduced red light.
- the light guide plate 105 emits laser light, green laser light, and blue laser light uniformly from a main surface (not shown).
- the G light source 102b adds an optical component such as a condenser lens (not shown) to the wavelength conversion laser light source shown in any of Embodiments 1 to 4, and the output light is efficiently supplied to the optical fiber 103. They are coupled and guided to the light guide plate 105.
- an image display device can be realized with excellent color reproducibility and low power consumption.
- a stable and high-power laser light source is required. By using the wavelength conversion laser light source shown in any of Embodiments 1 to 4, the image display device can be enlarged. Screening is possible.
- a liquid crystal display device using a transmissive liquid crystal panel as a spatial light modulation element has been described as an example.
- DMD Digital Micro-mirror Device
- reflective liquid crystal is used. The same effect can be exhibited even in an image display device such as a projector using (Liquid Crystal On Silicon: LCOS) as a spatial modulation element.
- LCOS Liquid Crystal On Silicon
- an optical fiber, a light guide unit, and a light guide plate are used for the optical system that guides the light emitted from the laser light source to the spatial modulation element.
- a wavelength conversion laser light source includes a fundamental laser light source for generating a fundamental wave, a first mirror and a second mirror arranged to face each other, the first mirror, A wavelength conversion element that is arranged between the second mirror and converts the wavelength of the fundamental wave; and a temperature control unit that controls the temperature of the wavelength conversion element.
- a part of the fundamental wave is wavelength-converted, and a fundamental wave that is not wavelength-converted is reflected by the first mirror and the second mirror, repeatedly incident on the wavelength conversion element, and wavelength-converted.
- a control part is arrange
- the fundamental wave is wavelength-converted by the wavelength conversion element, and the fundamental wave that has not been wavelength-converted is reflected by the first mirror and the second mirror, and is repeatedly transmitted to the wavelength conversion element.
- the fundamental wave is repeatedly wavelength-converted while changing the incident angle inside the wavelength conversion element, so that the temperature tolerance of the wavelength conversion element can be expanded while maintaining high wavelength conversion efficiency.
- the temperature control unit is disposed so as to contact the wavelength conversion element and the amount of the fundamental wave incident on the temperature control unit is reduced, the fundamental wave not incident on the wavelength conversion element is absorbed by the temperature control unit. This can be prevented, and fluctuations in the output of the wavelength conversion laser light source can be reduced.
- the wavelength conversion laser light source that can suppress fluctuations in the wavelength conversion efficiency of the wavelength conversion element due to unnecessary fundamental waves, has high wavelength conversion efficiency from the fundamental wave to the second harmonic, and has high output and high stability. Can be realized.
- the first mirror includes a first concave mirror having a first curvature
- the second mirror includes a second concave mirror having a second curvature different from the first curvature
- the wavelength conversion laser light source includes a condensing optical system arranged so that the fundamental wave has a condensing point in the wavelength conversion element, and between the first concave mirror and the temperature control unit and / or the It is preferable to further include a fundamental wave light shielding unit that is disposed between the second concave mirror and the temperature control unit and that reduces the amount of the fundamental wave absorbed by the temperature control unit.
- the fundamental wave is repeatedly incident on the wavelength conversion element while changing the incident angle, and converted into the second harmonic.
- the fundamental wave light shielding unit can prevent the fundamental wave that is not incident on the wavelength conversion element from being absorbed by the temperature control unit, output fluctuation of the wavelength conversion laser light source can be reduced.
- the fundamental wave shielding unit includes a fundamental wave absorption unit that absorbs the fundamental wave so that the fundamental wave does not enter the temperature control unit, and the fundamental wave absorption unit is thermally separated from the temperature control unit. It is preferred that
- the fundamental wave absorption unit absorbs the fundamental wave that is not incident on the wavelength conversion element, and the fundamental wave that is not incident on the wavelength conversion element can be prevented from being absorbed by the temperature control unit. Variations can be reduced.
- the wavelength conversion element is reduced by the heat generated from the fundamental wave absorption unit by reducing the temperature rise caused by the fundamental wave absorption unit absorbing the fundamental wave. It is possible to provide a wavelength-converted laser light source that prevents the temperature of the light from changing and that has a stable output.
- the fundamental wave shielding unit includes a reflection mirror that reflects the fundamental wave so that the fundamental wave does not enter the temperature control unit.
- the fundamental wave can be reflected so that the fundamental wave does not enter the temperature control unit, the fundamental wave that could not be incident on the wavelength conversion element can be prevented from entering the temperature control unit and reflected. Since the mirror does not absorb the fundamental wave and does not generate heat, the heat dissipation mechanism can be omitted, and the cost of the heat dissipation mechanism can be reduced.
- the thickness of the wavelength conversion element is T
- the length of the first concave mirror in the thickness direction of the wavelength conversion element is r 1
- the length of the second concave mirror in the thickness direction of the wavelength conversion element R 2 the distance between the first concave mirror and the end surface of the wavelength conversion element on the first concave mirror side is d 1
- the second concave mirror and the second of the wavelength conversion element Assuming that the distance from the end surface on the concave mirror side is d 2 , the fundamental wave light incident on the reflection mirror when the reflection mirror is disposed between the first concave mirror and the temperature control unit.
- An angle ⁇ 1 formed between the axis and the reflecting surface of the reflecting mirror satisfies (r 1 ⁇ T) / 2> d 1 ⁇ tan ( ⁇ 2 ⁇ 1 ), and the reflecting mirror is connected to the second concave mirror and the When it is placed between the temperature control unit, it is incident on the reflection mirror
- the angle ⁇ 2 formed by the optical axis of the wave and the reflecting surface of the reflecting mirror preferably satisfies (r 2 ⁇ T) / 2> d 2 ⁇ tan ( ⁇ 2 ⁇ 2 ).
- the fundamental wave reflected by the reflecting mirror can be emitted to the outside of the first concave mirror and the second concave mirror without being reflected again by the first concave mirror and the second concave mirror.
- the temperature control unit has a reflection end surface that reflects the fundamental wave so that the fundamental wave does not enter the temperature control unit.
- the fundamental wave can be reflected so that the fundamental wave does not enter the temperature control unit, the fundamental wave that could not be incident on the wavelength conversion element can be prevented from entering the temperature control unit, and the temperature can be reduced. Since the end surface of the control unit can be used as a reflecting surface, the number of parts can be reduced and the cost of the apparatus can be reduced.
- the thickness of the wavelength conversion element is T
- the length of the first concave mirror in the thickness direction of the wavelength conversion element is r 1
- the length of the second concave mirror in the thickness direction of the wavelength conversion element R 2 the distance between the first concave mirror and the end surface of the wavelength conversion element on the first concave mirror side is d 1
- the second concave mirror and the second of the wavelength conversion element When the distance between the end surface on the concave mirror side is d 2 and the reflection end surface is provided on the first concave mirror side, the optical axis of the fundamental wave incident on the reflection end surface and the reflection end surface are formed.
- the angle ⁇ 1 satisfies (r 1 ⁇ T) / 2> d 1 ⁇ tan ( ⁇ 2 ⁇ 1 ), and when the reflection end surface is provided on the second concave mirror side, the basic incident on the reflection end surface the angle formed phi 2 between the optical axis and the reflecting end face of the wave, (r 2 -T) / 2 It is preferable to satisfy the d 2 ⁇ tan ( ⁇ -2 ⁇ 2).
- the fundamental wave reflected by the reflection end face can be emitted to the outside of the first concave mirror and the second concave mirror without being reflected again by the first concave mirror and the second concave mirror.
- the first mirror includes a first concave mirror having a first curvature
- the second mirror includes a second concave mirror having a second curvature different from the first curvature
- the fundamental wave reflected by at least one of the first and second concave mirrors does not enter the temperature control unit, but always passes through the wavelength conversion element and changes from the fundamental wave to the second harmonic. Since the wavelength is converted, the amount of the fundamental wave absorbed by the temperature control unit can be reduced. As a result, the temperature increase of the wavelength conversion element can be prevented, and the output fluctuation of the wavelength conversion laser light source can be reduced.
- One of the first and second mirrors includes a concave mirror having a first curvature, and the other includes a cylindrical mirror having a second curvature different from the first curvature in the width direction of the wavelength conversion element. It is preferable that the cylindrical mirror limit the diameter of the fundamental wave in the thickness direction of the wavelength conversion element to be equal to or less than the thickness of the wavelength conversion element.
- the fundamental wave diameter does not become larger than the thickness of the wavelength conversion element, and the fundamental wave is always the wavelength conversion element. Therefore, the amount of the fundamental wave absorbed by the temperature control unit can be reduced. As a result, the temperature increase of the wavelength conversion element can be prevented, and the output fluctuation of the wavelength conversion laser light source can be reduced.
- At least one of the first and second mirrors has a notch region for allowing the fundamental wave generated from the fundamental wave laser light source to enter the wavelength conversion element.
- the fundamental wave can be easily incident on the wavelength conversion element from the notch region.
- An image display device includes a laser light source that generates laser light of at least one of blue, green, and red, a spatial light modulation element, and light emitted from the laser light source to the spatial light modulation element.
- An optical system for guiding, and the laser light source is the wavelength conversion laser light source according to any one of the above.
- a stable and high-output wavelength conversion laser light source can be used as a laser light source, so that the image display device can be enlarged in screen size, excellent in color reproducibility, and low power consumption.
- An apparatus can be realized.
- the wavelength conversion laser light source of the present invention is useful as a highly efficient wavelength conversion laser light source having excellent temperature controllability and output stability.
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Abstract
Description
図1及び図2は、本発明の実施の形態1における波長変換レーザ光源の構成の一例を示す図であり、図1は、本実施の形態における波長変換レーザ光源の構成を上面から見た図であり、図2は、図1に示す波長変換レーザ光源の構成を側面から見た図である。以下において、図1中の矢印10及び図2中の矢印11で示す方向をそれぞれ素子幅方向(波長変換素子3の幅方向)、素子厚方向(波長変換素子3の厚さ方向)とする。
図15及び図16は、本発明の実施の形態2における波長変換レーザ光源の構成の一例を示す図であり、図15は、本実施の形態における波長変換レーザ光源の構成を上面から見た図であり、図16は、図15に示す波長変換レーザ光源の構成を側面から見た図である。以下において、図15中の矢印10及び図16中の矢印11で示す方向をそれぞれ素子幅方向、素子厚方向とする。
図17及び図18は、本発明の実施の形態3における波長変換レーザ光源の構成の一例を模式的に示す図であり、図17は、本実施の形態における波長変換レーザ光源の構成を上面から見た図であり、図18は、図17に示す波長変換レーザ光源の構成を側面から見た図である。以下において、図17中の矢印10及び図18中の矢印11で示す方向をそれぞれ素子幅方向、素子厚方向とする。
本実施の形態では、第2の凹面ミラー5の代わりにシリンドリカルミラー51を用いることにより基本波のビーム直径の広がりを制限し、素子固定台7に基本波レーザ光が照射されないようにする構成について説明する。本構成を用いることにより、上記実施の形態1から実施の形態3で述べてきたのと同様の波長変換素子3の温度変動に起因する第2高調波出力の変動低減効果が得られることを示す。
図22は、画像表示装置の一例として、上記の実施の形態1から実施の形態4において示した波長変換レーザ光源のいずれか一つを含むバックライト照明装置を用いた液晶表示装置の構成を示す概略図である。
Claims (11)
- 基本波を生成するための基本波レーザ光源と、
互いに向かい合うように配置された第1のミラー及び第2のミラーと、
前記第1のミラーと前記第2のミラーとの間に配置され、前記基本波の波長を変換するための波長変換素子と、
前記波長変換素子の温度を制御するための温度制御部とを備え、
前記波長変換素子において前記基本波の一部が波長変換され、且つ、波長変換されていない基本波が前記第1のミラー及び前記第2のミラーにより反射されて前記波長変換素子に繰り返し入射されて波長変換され、
前記温度制御部は、前記波長変換素子に接するように配置され、前記温度制御部へ入射される前記基本波の光量が低減されることを特徴とする波長変換レーザ光源。 - 前記第1のミラーは、第1の曲率を有する第1の凹面ミラーを含み、
前記第2のミラーは、前記第1の曲率と異なる第2の曲率を有する第2の凹面ミラーを含み、
前記基本波が前記波長変換素子内に集光点を持つように配置された集光光学系と、
前記第1の凹面ミラーと前記温度制御部との間及び/又は前記第2の凹面ミラーと前記温度制御部との間に配置され、前記温度制御部に吸収される基本波の光量を低減するための基本波遮光部とをさらに備えることを特徴とする請求項1に記載の波長変換レーザ光源。 - 前記基本波遮光部は、前記基本波が前記温度制御部に入射しないように前記基本波を吸収する基本波吸収部を含み、
前記基本波吸収部は、前記温度制御部とは熱的に分離されることを特徴とする請求項2に記載の波長変換レーザ光源。 - 前記基本波遮光部は、前記基本波が前記温度制御部に入射しないように前記基本波を反射する反射ミラーを含むことを特徴とする請求項2に記載の波長変換レーザ光源。
- 前記波長変換素子の厚さをT、前記波長変換素子の厚さ方向における前記第1の凹面ミラーの長さをr1、前記波長変換素子の厚さ方向における前記第2の凹面ミラーの長さをr2、前記第1の凹面ミラーと前記波長変換素子の前記第1の凹面ミラー側の端面との間の距離をd1、前記第2の凹面ミラーと前記波長変換素子の前記第2の凹面ミラー側の端面との間の距離をd2とすると、前記反射ミラーが前記第1の凹面ミラーと前記温度制御部との間に配置される場合、前記反射ミラーに入射する基本波の光軸と前記反射ミラーの反射面との成す角θ1は、(r1-T)/2>d1×tan(π-2θ1)を満たし、前記反射ミラーが前記第2の凹面ミラーと前記温度制御部との間に配置される場合、前記反射ミラーに入射する基本波の光軸と前記反射ミラーの反射面との成す角θ2は、(r2-T)/2>d2×tan(π-2θ2)を満たすことを特徴とする請求項4に記載の波長変換レーザ光源。
- 前記温度制御部は、前記基本波が前記温度制御部に入射しないように前記基本波を反射する反射端面を有することを特徴とする請求項2に記載の波長変換レーザ光源。
- 前記波長変換素子の厚さをT、前記波長変換素子の厚さ方向における前記第1の凹面ミラーの長さをr1、前記波長変換素子の厚さ方向における前記第2の凹面ミラーの長さをr2、前記第1の凹面ミラーと前記波長変換素子の前記第1の凹面ミラー側の端面との間の距離をd1、前記第2の凹面ミラーと前記波長変換素子の前記第2の凹面ミラー側の端面との間の距離をd2とすると、前記反射端面が前記第1の凹面ミラー側に設けられる場合、前記反射端面に入射する基本波の光軸と前記反射端面との成す角φ1は、(r1-T)/2>d1×tan(π-2φ1)を満たし、前記反射端面が前記第2の凹面ミラー側に設けられる場合、前記反射端面に入射する基本波の光軸と前記反射端面との成す角φ2は、(r2-T)/2>d2×tan(π-2φ2)を満たすことを特徴とする請求項6に記載の波長変換レーザ光源。
- 前記第1のミラーは、第1の曲率を有する第1の凹面ミラーを含み、
前記第2のミラーは、前記第1の曲率と異なる第2の曲率を有する第2の凹面ミラーを含み、
前記第1及び第2の凹面ミラーの少なくとも一方は、前記波長変換素子の厚さ方向において、前記波長変換素子の厚さ方向の中心を0とし、前記波長変換素子の厚さをTとしたとき、-T/2からT/2までの領域のみ前記基本波を反射することを特徴とする請求項1に記載の波長変換レーザ光源。 - 前記第1及び第2のミラーの一方は、第1の曲率を有する凹面ミラーを含み、他方は、前記波長変換素子の幅方向に前記第1の曲率と異なる第2の曲率を有するシリンドリカルミラーを含み、
前記シリンドリカルミラーは、前記波長変換素子の厚さ方向における前記基本波の直径を前記波長変換素子の厚さ以下に制限することを特徴とする請求項1に記載の波長変換レーザ光源。 - 前記第1及び第2のミラーの少なくとも一方は、前記基本波レーザ光源から生成された基本波を前記波長変換素子に入射するための切り欠き領域を有することを特徴とする請求項1~9のいずれかに記載の波長変換レーザ光源。
- 青色、緑色、及び赤色のうち少なくとも1色のレーザ光を発生するレーザ光源と、
空間光変調素子と、
前記レーザ光源から出射する光を前記空間光変調素子に導く光学系とを備え、
前記レーザ光源は、請求項1~10のいずれかに記載の波長変換レーザ光源であることを特徴とする画像表示装置。
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