WO2007043560A1 - 波長変換モジュール、レーザ光源装置、2次元画像表示装置、バックライト光源、液晶ディスプレイ装置及びレーザ加工装置 - Google Patents
波長変換モジュール、レーザ光源装置、2次元画像表示装置、バックライト光源、液晶ディスプレイ装置及びレーザ加工装置 Download PDFInfo
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- WO2007043560A1 WO2007043560A1 PCT/JP2006/320266 JP2006320266W WO2007043560A1 WO 2007043560 A1 WO2007043560 A1 WO 2007043560A1 JP 2006320266 W JP2006320266 W JP 2006320266W WO 2007043560 A1 WO2007043560 A1 WO 2007043560A1
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- Prior art keywords
- wavelength conversion
- optical fiber
- fundamental wave
- light source
- conversion module
- Prior art date
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Classifications
-
- 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
- G02F1/37—Non-linear optics for second-harmonic generation
- G02F1/377—Non-linear optics for second-harmonic generation in an optical waveguide structure
- G02F1/3775—Non-linear optics for second-harmonic generation in an optical waveguide structure with a periodic structure, e.g. domain inversion, for quasi-phase-matching [QPM]
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4206—Optical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4214—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
-
- 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
- G02F1/01—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 for the control of the intensity, phase, polarisation or colour
- G02F1/13—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 for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
-
- 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
- G02F1/3532—Arrangements of plural nonlinear devices for generating multi-colour light beams, e.g. arrangements of SHG, SFG, OPO devices for generating RGB light beams
-
- 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
- G02F2202/00—Materials and properties
- G02F2202/20—LiNbO3, LiTaO3
-
- 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
- G02F2203/21—Thermal instability, i.e. DC drift, of an optical modulator; Arrangements or methods for the reduction thereof
Definitions
- Wavelength conversion module laser light source device, two-dimensional image display device, backlight light source, liquid crystal display device, and laser processing device
- the present invention relates to a wavelength conversion module using a nonlinear optical element (wavelength conversion element) used for optical wavelength conversion, a laser light source device using the module, a two-dimensional image display device, a knocklight light source, and a liquid crystal display
- the present invention relates to an apparatus and a laser processing apparatus.
- High-power laser light sources are attracting attention as light sources used in laser cache devices or laser displays.
- high-power laser light sources in the infrared light region solid-state lasers such as YAG lasers, and fiber lasers using fibers doped with rare earths such as Yb and Nd have been developed.
- Semiconductor lasers using gallium arsenide, gallium nitride, or the like have been developed as high-power laser light sources in the red and blue regions.
- Nonlinear optical elements include, for example, lithium niobate (LiNbO) and lithium tantalate.
- LiTaO lithium triborate
- LiB 2 O LiB 2 O: LBO
- j8 barium borate j8— BaB 2 O
- the following nonlinear optical element is used in an apparatus for obtaining an output in the green region.
- 200-300mW class green laser light can be obtained by using a quasi-phase-matched (QPM) wavelength conversion element consisting of a lithium niobate crystal with a domain-inverted structure. It is preferably used because high conversion efficiency can be obtained by a non-linear optical constant.
- QPM quasi-phase-matched
- non-linear optical single crystals such as LBO and KTP are used in apparatuses for obtaining high-power laser light in the green region of several W class.
- the LBO crystal has a small nonlinear optical constant, it is necessary to form a resonator in order to obtain high conversion efficiency, and to dispose the LBO crystal in the resonator. It has the disadvantage of being complicated and requiring precise alignment.
- the KTP crystal is larger than that of the nonlinear optical constant force LBO crystal, and therefore has the advantage that high conversion efficiency can be obtained without configuring a resonator, while the fundamental wave and the second generated easily breaks and degrades crystals due to higher harmonics! /
- Non-patent document 2 reports an example of realizing 3W green light generation.
- the laser light generated by the fundamental wave light source 101 propagates through the space, is condensed by the condenser lens 102, and enters the wavelength conversion element 103.
- a part of the incident fundamental wave is wavelength-converted by the wavelength conversion element 103.
- the generated harmonics and residual fundamental wave are shaped into parallel light by the recollimating lens 104.
- the measured harmonic and the residual fundamental wave are separated into the harmonic 106 and the residual fundamental wave 107 by the beam splitter 105.
- the residual fundamental wave of the high-energy energy separated by the beam splitter 105 is processed by the beam damper 108.
- the KTP crystal and the LBO crystal have the disadvantage that the crystal is easily broken or deteriorated by the second harmonic.
- the power density of the fundamental wave incident on each wavelength conversion element is reduced, thereby causing deterioration. It is also being studied to suppress it (for example, Patent Document 3).
- the fundamental wave emitted from the fundamental wave light source 101 is collected by the condenser lens 102a and then enters the first wavelength conversion element 103a.
- the fundamental wave is wavelength-converted by the first wavelength conversion element 103a and then returned to parallel light by the collimator lens 104a.
- the harmonic wave 106a is separated by the beam splitter 105a.
- the residual fundamental wave separated by the beam splitter 105a is condensed by the condenser lens 102b, and then enters the second wavelength conversion element 103b.
- the residual fundamental wave is wavelength-converted by the second wavelength conversion element 103b and then returned to parallel light by the collimator lens 104b.
- the beam splitter 105b separates the harmonic wave 106b and the residual fundamental wave 107.
- the residual fundamental wave 107 is absorbed and diffused by the heat sink 108.
- a conventional wavelength converter as shown in Fig. 15, for example, when a fundamental wave of 8-9W is input to obtain a harmonic of 3W, the remaining fundamental wave of 5-6W remains. It is emitted as the fundamental wave.
- Such residual fundamental waves are high-energy energy emitted in a parallel light state.
- a heat radiation means such as a large beam damper, a heat radiation fin, or a heat sink was required.
- the wavelength conversion device as described above requires a relatively large device because optical components such as lenses and beam splitters need to be arranged at predetermined locations and light rays can be routed in free space. &) I got it.
- Such a conventional wavelength conversion device is not used for large-sized devices such as laser processing machines.
- the power that can be applied In recent years, it has been difficult to introduce into a small consumer device such as a laser display that has been proposed as a new application of laser.
- the laser light source can be reduced in size by using a fiber laser to narrow the fundamental wave so as to be suitable for wavelength conversion.
- the wavelength conversion element and various optical components need to be arranged in the same manner as in the conventional configuration, it is difficult to downsize the entire wavelength conversion device even if a fiber laser is used.
- Patent Document 1 Japanese Patent No. 3261594
- Patent Document 2 Japanese Patent No. 3424125
- Patent Document 3 Japanese Patent Laid-Open No. 11 271823
- Non-Patent Document 1 Applied Physics letters, 59, 21, 2657-5659 (1991)
- Non-Patent Document 2 Conference on Lasers and Electro -Optics 2005 (CLE O2005), Technical digest, CFL-1 (2005)
- An object of the present invention is to obtain a large-scale heat dissipation of the residual fundamental wave generated at the time of wavelength conversion when obtaining a high-energy harmonic by converting the wavelength of the fundamental wave using a wavelength conversion element. It is an object of the present invention to provide a downsized wavelength conversion module that can be processed without providing means.
- a wavelength conversion module includes a first fundamental wave propagation optical fiber for propagating a fundamental wave emitted from a laser light source, and optically coupled to the first fundamental wave propagation optical fiber.
- a first harmonic propagation optical fiber for propagating the emitted harmonics, and the core diameter of the first harmonic propagation optical fiber is the core of the first fundamental wave propagation optical fiber It is smaller than the diameter.
- a laser light source device includes the wavelength conversion module, and the wavelength conversion module outputs laser light having an average output of 2 W or more and a wavelength of 200 to 800 nm.
- a two-dimensional image display device includes the laser light source device. Then, an image is displayed using laser light having an average output of 2 W or more emitted from the laser light source device.
- a backlight light source includes the laser light source device, and uses a light emitted from the laser light source device to emit a laser beam having an average output of 2 W or more. Illuminate.
- a liquid crystal display device includes the backlight light source.
- a laser processing apparatus includes the laser light source apparatus, and processes an object using laser light having an average light source output of 2 W or more emitted from the laser light source apparatus.
- FIG. 1A is a schematic view of the wavelength conversion module of the first embodiment as viewed from the side
- FIG. 1B is a schematic view of the wavelength conversion module of the first embodiment as viewed from the top.
- FIG.2 A graph showing the relationship between the propagation loss of the 1064 fundamental wave and the fiber core diameter of the optical fiber.
- FIG. 3 is a graph showing the relationship between the propagation loss of a 1064 fundamental wave and the radius of curvature of the curved part formed in the optical fiber.
- FIG. 4A is a schematic diagram showing an example of the shape of a coiled curved portion formed in an optical fiber
- FIG. 4B is an example of the shape of a spiral coiled curved portion formed in an optical fiber
- 4C is a schematic diagram illustrating an example of the shape of a wavy curved portion formed in the optical fiber
- FIG. 4D is an example of the shape of the wavy curved portion formed in the optical fiber. It is a schematic diagram which shows.
- FIG. 5 is a schematic configuration diagram of a laser light source device according to a second embodiment.
- FIG. 6A is a schematic diagram showing a side force of a wavelength conversion module including a plurality of wavelength conversion elements on the base of the third embodiment
- FIG. 6B shows a plurality of bases on the base of the third embodiment
- FIG. 3 is a schematic view of a wavelength conversion module provided with a wavelength conversion element in which the upper surface force is also viewed.
- Fig. 7 Fig. 7A is a schematic view of the wavelength conversion module for multi-stage connection (cascade connection) as seen from the side
- Fig. 7B is a schematic view of the wavelength conversion module for multi-stage connection (cascade connection) as well as the top surface force. is there.
- FIG. 8 is a schematic diagram of a configuration of a laser light source device using multi-stage wavelength conversion modules.
- FIG. 9 is a schematic diagram showing an example of a laser display device (two-dimensional image display device) using a laser light source device.
- FIG. 10A is a schematic diagram showing an example of the arrangement of laser light source devices in the laser display device structure
- FIG. 10B is a schematic diagram of a cross section taken along the line 10-10 ′ of the schematic diagram of FIG. 10A.
- FIG. 11 is a diagram showing the color reproduction range of the S-RGB standard and the color reproduction range when a laser beam of 530 nm is selected as green light.
- FIG. 12A is a schematic configuration diagram showing an example of a backlight device using a laser light source device
- FIG. 12B is a partially enlarged schematic diagram of the backlight device shown in FIG. 12A.
- FIG. 13 is a schematic diagram showing an example of a laser processing drawing apparatus using a laser light source device.
- FIG. 14 is a schematic diagram showing a configuration of a conventional wavelength converter.
- FIG. 15 is a schematic diagram showing a configuration of a conventional wavelength converter.
- FIG. 1A is a schematic side view of the wavelength conversion module 210 of the first embodiment.
- FIG. 1B is a schematic top view of the wavelength conversion module 210.
- FIG. 1B is a schematic top view of the wavelength conversion module 210.
- 201 is a first fundamental wave propagating optical fiber
- 202 is a first wavelength converting element
- 203 is a first harmonic propagating optical fiber
- 204 is an incident-side group lens
- 205 Is the exit side assembly lens
- 206 is the base
- 207 is the penoleche element
- 208 is the temperature sensor
- 209 is the heat sink
- Reference numeral 310 denotes a laser light source.
- the first harmonic propagation optical fiber 203 has a curved portion 213 formed by forming the fiber in a coil shape.
- the first fundamental wave propagating optical fiber 201 and the incident-side group lens 204 are configured so that the incident-side group lens 204 condenses the fundamental wave emitted from the first fundamental wave-propagating optical fiber 201, and the first wavelength Strange It is aligned so as to be incident on the replacement element 202, and is disposed on the base 206.
- the first harmonic propagating optical fiber 203 and the exit-side assembled lens 205 are coupled to the exit-side assembled lens 205 by combining the harmonics and the residual fundamental wave emitted from the first wavelength conversion element 202.
- the first harmonic propagation optical fiber 203 is aligned so as to be incident on the base 206.
- the fundamental wave emitted from the laser light source 310 enters the first fundamental wave propagation optical fiber 201 and propagates through the first fundamental wave propagation optical fiber 201. Then, after exiting from the first fundamental wave propagating optical fiber 201, it is condensed by the incident-side group lens 204 and enters the first wavelength conversion element 202. Since the phase matching wavelength of the first wavelength conversion element 202 changes depending on the temperature of the crystal, it is preferable that the temperature is controlled by the temperature sensor 208 and the Peltier element 207 with an accuracy of about 0. Oe. In the wavelength conversion module 210, the temperature fluctuation is suppressed by providing the heat sink 209.
- a part of the fundamental wave incident on the first wavelength conversion element 202 is wavelength-converted into a harmonic.
- the harmonics incident on the first harmonic propagation optical fiber 203 propagate in the first harmonic propagation optical fiber 203 in a single mode. Since the core diameter of the first harmonic propagation optical fiber 203 is smaller than the core diameter of the first fundamental propagation optical fiber 201, the residual fundamental wave passes through the first harmonic propagation optical fiber 203. When it propagates, it loses, and the energy of the loss is released as surface heat.
- the core diameter of the first harmonic propagation optical fiber 203 is made smaller than the core diameter of the first fundamental propagation optical fiber 201, and the cutoff wavelength of the first harmonic propagation optical fiber 203 is set to the first wavelength.
- the first fundamental wave propagation optical fiber 201 needs to be linearly polarized light along a specific crystal axis when entering the first wavelength conversion element 202, a general single mode fiber is not used. Nagu PANDA fiber, bow tie fiber, etc. It is desirable to use a card fiber or the like.
- the first harmonic propagation optical fiber 203 a general single mode fiber or a polarization maintaining fiber is used depending on the application.
- FIG. 2 shows an example of the results of our experiment, in a single mode optical fiber.
- the propagation loss of the fundamental wave of 1064nm is less than 0.5dBZm in an optical fiber with a core diameter of 6m, which is optimal for the propagation of the fundamental wave of 1064nm in single mode. It was.
- the propagation loss is about 2 to 3 dBZm, Q ⁇ (in an optical fiber with a core diameter of 3 m, which is equivalent to 0.5 times In this way, the propagation loss is 30 dBZm, which means that the optical fiber core diameter is 6 m, which is optimal for propagating the fundamental wave of 1064 nm in a single mode.
- the ratio is 9 times or less, the propagation loss is greatly increased.
- the core diameter of the first harmonic propagation optical fiber 203 with respect to the core diameter of the first fundamental propagation optical fiber 201 is 0.9 times or less, and It can be seen that the energy of the residual fundamental wave after wavelength conversion can be significantly lost in the first harmonic propagation optical fiber 203 by making it 0.8 times or less.
- the multiplication factor of the first harmonic propagation optical fiber 203 with respect to the core diameter of the first fundamental propagation optical fiber 201 is 0.5 times or more, and the loss of harmonics is sufficiently low. Point power is also preferable.
- the inventors of the present invention have studied means for increasing the energy loss effect of the residual fundamental wave by the first harmonic propagation optical fiber 203 in the wavelength conversion module 210, and the first harmonic propagation. It has been found that the energy loss of the residual fundamental wave can be greatly increased by forming a curved portion 213 having a specific curvature radius or less in a predetermined portion of the optical fiber 203.
- Fig. 3 shows the propagation loss of the fundamental wave of 1064nm and the curvature of the coil part of the optical fiber when the coil part is formed in a single-mode fiber with a core diameter of 5 ⁇ m. The relationship with the radius is shown.
- the propagation loss of the fundamental wave of 1064 nm is 0.4 dBZkm or less when the radius of curvature force exceeds ⁇ Omm.
- the radius of curvature is 60 mm or less, the propagation loss increases rapidly, and when the radius of curvature is 10 mm, the propagation loss is 4 dBZkm.
- the fundamental wave can be removed more effectively by increasing the propagation loss of the fundamental wave by setting the radius of curvature to 60 mm or less.
- the radius of curvature is 6 Omm or less, the fundamental wave loss is much larger, but the harmonic propagation loss is 0.4 dBZkm or less.
- the smaller the radius of curvature the greater the propagation loss of the fundamental wave.
- the radius of curvature is less than 10 mm, the optical fiber will bend and may be damaged when bent.
- the radius of curvature of the annular portion 213, as shown in FIG. 4A even when the annular portions have substantially the same radius of curvature, the radius of curvature of the annular portion as shown in FIG. A spiral coil that gradually decreases may be used.
- 4C may be a wavy shape in which the heights of the peaks are substantially the same, or may be a wavy shape in which the heights of the peaks are gradually reduced as shown in FIG. 4D.
- the wavelength conversion module 210 When the wavelength conversion module 210 is used in a laser cafe device, a laser display, or the like, it is preferable to arrange the curved portion 213 at a position where heat can be efficiently radiated. A specific example of this arrangement will be described in a sixth embodiment described later.
- Examples of the wavelength conversion element 202 include a stoichiometric composition and coincident melting.
- (Congruent) composition of lithium niobate, lithium tantalate, magnesium oxide lithium lithium niobate, magnesium oxide doped lithium tantalate, titanium phosphate phosphate examples thereof include elements having the same power as lithium, lithium triborate, potassium niobate, and potassium tantalate.
- the wavelength conversion element 202 one having a periodically poled structure is preferably used.
- the molar concentration of magnesium oxide in the magnesium oxide doped lithium niobate element or magnesium oxide doped lithium niobate crystal element having the stoichiometric composition and the conductive composition is 5 to 6.3 mol%, Further, it is preferably 5.3 to 6.3 mol%. In other words, in order to suppress photodamage and crystal deterioration in which the refractive index changes due to light, 5 mol% or more, 5.3 mol% or more, and 6.3 mg% or less is added in the range of 6.3 mol% or less. It is desirable to do.
- an acid-magnesium-doped lithium niobate element having a periodic polarization inversion structure has a large nonlinear optical constant and a wavelength conversion efficiency. Particularly excellent in point power.
- examples of the base 206 include a metal base material having a force such as aluminum and brass, and a ceramic base material such as a minus thermal expansion ceramic base material.
- a negative thermal expansion ceramic substrate is used to reduce the phase mismatch due to crystal heat generation and the required accuracy of temperature control. Is preferably used.
- the thermal expansion coefficient of the negative thermal expansion ceramic substrate, -! LxlO 7 it is preferably in the range of 0 DEG /,.
- the wavelength conversion module 210 when the residual fundamental wave energy propagates in the harmonic propagation optical fiber 203, its surface force is also dispersed and released as heat. The Therefore, energy concentration can be avoided as in the case where the conventional wavelength converter emits the residual fundamental wave as parallel light. As a result, heat dissipation means such as a large beam damper is not required, which is required in the conventional wavelength converter.
- wavelength conversion module 210 for example, by converting the wavelength of a fundamental wave having a wavelength of 700 to 1600 nm, a high-power laser beam having a wavelength of 200 to 800 nm and an average output of 2 W or more Can be obtained.
- a laser light source device using the wavelength conversion module 210 of the first embodiment will be described in detail with reference to FIG.
- FIG. 5 is a schematic diagram showing a configuration example of a laser light source device using the wavelength conversion module 210.
- 310 indicates the laser light source used in the present embodiment
- 301 is a pump (pump) laser diode (LD) light source
- 303 is a Yb-doped double clad finno
- 302 and 304 are fibers.
- a grating 305 indicates a polarizer for making the oscillated light linearly polarized light.
- the fiber gratings 302 and 304 constitute a resonator.
- the fiber dulling 304 has a reflection center wavelength of 1064 nm and a reflection bandwidth of 0.10 nm in order to adjust the bandwidth of the laser light to oscillate to match the wavelength tolerance of 0.1 nm of the wavelength conversion element of the polarization inversion structure. What is 09nm is used.
- the Yb-doped double clad fiber 303 is excited by a pumping LD 301 (wavelength of about 195 nm, maximum output of 30 w) and generates a fundamental wave having a wavelength near 1064 nm.
- a laser light source 310 generates continuous wave light (CW) with a wavelength of around 1064 nm, a node width of 0.09 nm, and an average output of 7 W.
- the first harmonic propagation optical fiber 203 is a 4 m core 125 m clad single so as to propagate green light, which is a harmonic, in the lowest order mode (single mode).
- a mode fiber of 10 m is used, and the first fundamental wave propagation optical fiber 201 is a polarization-maintaining single mode fiber such as 6 ⁇ m core—125 ⁇ m clad PANDA.
- the fundamental wave (around 1040-11 OOnm) whose wavelength is doubled compared to the propagation loss of green light (around 520-550 nm), which is the second harmonic propagating through the first harmonic propagation optical fiber 203 Propagation loss increases significantly.
- wavelength conversion element made of crystals.
- the temperature of the wavelength conversion element when obtaining a w-class output is generally heated to 100 ° C or higher.
- wavelength conversion element consisting of periodically poled MgO: LiNBO crystals near room temperature of 20-40 ° C
- the first wavelength conversion element 202 is preferably temperature-controlled with an accuracy of 0. oe because the phase matching wavelength changes depending on the crystal temperature.
- the fundamental light emitted from the Yb-doped double clad fiber 303 and passed through the fiber grating 304 propagates through the first fundamental wave propagation optical fiber 201 made of a PANDA type polarization maintaining fiber. Then, the fundamental wave light emitted from the first fundamental wave propagation optical fiber 201 is collected by the incident-side lens group 204 and enters the first wavelength conversion element 202.
- the fundamental light incident on the first wavelength conversion element 202 is partly converted into 532 nm green light (second harmonic), which is the wavelength of 1 Z2 of the fundamental light, and part of the fundamental light is fundamental. It remains as a wave.
- the generated green light and the residual fundamental wave are emitted from the first wavelength conversion element 202 and then coupled to the first harmonic propagation optical fiber 203 by the emission-side group lens 205. Then, the energy of the residual fundamental wave is converted into heat while propagating through the first harmonic propagation optical fiber 203. At this time, the second harmonic 306 is hardly lost.
- a second harmonic of 2 to 4W can be obtained.
- FIGS. 6A and 6B are schematic side views of the wavelength conversion module 510
- FIG. 6B is a schematic top view of the wavelength conversion module 510.
- the description of the components indicated by the same reference numerals as those in the first embodiment and the second embodiment is the same as that described above, and the detailed description thereof is omitted.
- 202a is a first wavelength conversion element
- 202b is a second wavelength conversion element
- 201 is a first fundamental wave propagation optical fiber
- 203a is a first harmonic wave propagation optical fiber
- 2 03b is the second harmonic propagating light
- 204 is the first incident side lens group
- 501 is the recollimating lens
- 502 ⁇ beam splitter 503 ⁇ mirror
- 504 ⁇ second human irradiation j Thread and
- Reference numeral 205a denotes a first exit side group lens
- 205b denotes a second exit side group lens
- 206 denotes a base
- 207 denotes a Peltier element
- 208 denotes a temperature sensor
- 209 denotes a heat sink
- 310 denotes a laser light source.
- the harmonic propagation optical fibers 203a and 203b have curved portions 213a and 213b, respectively, in which the fibers are formed in a coil shape.
- the fundamental wave emitted from the laser light source 310 propagates through the first fundamental wave propagation optical fiber 201, is condensed by the first incident-side group lens 204, and has the first wavelength.
- the light enters the conversion element 202a.
- a part of the fundamental wave incident on the first wavelength conversion element 202a is wavelength-converted into a harmonic.
- the beam splitter 502 separates the residual fundamental wave into a fundamental wave and a harmonic wave. Then, the separated harmonics are coupled to the first harmonic propagation optical fiber 203a by the first emission side group lens 205a and propagated therethrough.
- the separated residual fundamental wave is incident on the second incident-side group lens 504 by the mirror 503, is condensed by the second incident-side group lens 504, and enters the second wavelength conversion element 202b. Shoot. Then, a harmonic and a residual fundamental wave are generated from the second wavelength conversion element 202b. The generated harmonics and residual fundamental waves are coupled to the second harmonic propagation optical fiber 203b by the second exit-side group lens 205b and propagated therethrough.
- the generated harmonics are output from two optical fibers, the first harmonic propagation optical fiber 203a and the second harmonic propagation optical fiber 203b. These may be output together on a single fiber by using a compiler or bundle fiber.
- wavelength conversion module having two wavelength conversion elements is shown as an example, but more wavelength conversion elements may be included.
- the wavelength conversion apparatus when additional wavelength conversion elements are added to extract higher harmonics from the residual fundamental wave emitted from the first wavelength conversion element, the wavelength conversion apparatus is used. Complicated alignment of each optical component to be constructed was necessary. On the other hand, in the wavelength conversion module 510, the components are coupled and fixed at the time of assembling the module. Therefore, alignment deviation hardly occurs. As a result, the reliability of wavelength conversion can be improved. Further, since the residual fundamental wave is processed when propagating through the first harmonic propagation optical fiber 203a and the second harmonic propagation optical fiber 203b, a large heat dissipation means or the like is not required.
- the configuration of the wavelength conversion module 610 will be described with reference to FIGS. 7A and 7B.
- FIG. 7A is a schematic side view of the wavelength conversion module 610
- FIG. 7B is a schematic top view of the wavelength conversion module 610. Note that in the fourth embodiment, the description of the components denoted by the same reference numerals as those in the first to third embodiments is the same as that described above, and thus the detailed description thereof is omitted.
- 201 is a first fundamental wave propagation optical fiber
- 603 is a second fundamental wave propagation optical fiber
- 202 is a first wavelength conversion element
- 203 is a first harmonic propagation light.
- Fiber 204 is the first input side group lens
- 601 is the beam splitter
- 205 is the first output side group lens
- 602 is the second output side group lens
- 206 is the base
- 207 is the Peltier element
- 208 is the temperature
- Numeral 209 denotes a heat sink
- 310 denotes a laser light source.
- the feature of the wavelength conversion module 610 is that most of the residual fundamental wave emitted from the first wavelength conversion element 202 is separated by the beam splitter 601 and the residual fundamental wave is separated from the second emission side group. The point is that the lens 602 is coupled to the second fundamental wave propagation optical fiber 603.
- a plurality of wavelength conversion modules can be cascade-connected in a cascade manner.
- FIG. 8 shows a laser light source device including a wavelength conversion module 710 formed by connecting a plurality of wavelength conversion modules in a cascaded manner.
- a wavelength conversion module 610 is used for the first-stage wavelength conversion module 701 and the second-stage wavelength conversion module 702 that constitute the wavelength conversion module 710. Further, the wavelength conversion module 210 of the first embodiment is used for the termination wavelength conversion module 703.
- 701 is the first-stage wavelength conversion module
- 702 is the second-stage wavelength conversion module
- 703 are termination wavelength conversion modules
- 712, 722, and 732 are first fundamental wave propagation optical fibers
- 714, 724, and 734 are first harmonic wave propagation optical finos
- 711 and 721 are first wave propagation optical fibers, respectively.
- Two fundamental wave propagation optical fins, 713, 723, and 733 are wavelength conversion elements, and 715 and 725 are beam splitters.
- the fundamental wave emitted from the laser light source 310 propagates through the first fundamental wave propagation optical fiber 712 coupled to the first-stage wavelength conversion module 701. Then, the fundamental wave enters the wavelength conversion element 713, and a part of the fundamental wave is wavelength-converted into a harmonic. Then, the harmonic wave and the residual fundamental wave remaining without wavelength conversion are separated by the beam splitter 715. Most of the separated residual fundamental wave enters the second fundamental wave propagation optical fiber 711. Further, the separated harmonics are emitted from the first harmonic propagation optical fiber 714.
- the second fundamental wave propagation optical fiber 711 of the first-stage wavelength conversion module 701 is connected to the first fundamental wave propagation optical fiber 722 of the second-stage wavelength conversion module 702,
- the residual fundamental wave generated by the first-stage wavelength conversion module 701 can be incident on the wavelength conversion element 723 of the second-stage wavelength conversion module 702.
- the residual fundamental wave is incident on the wavelength conversion element 723, and a part of the fundamental wave is wavelength-converted into a harmonic.
- the harmonic wave and the residual fundamental wave remaining without wavelength conversion are separated by a beam splitter 725.
- Most of the separated residual fundamental wave is incident on the second fundamental wave propagation fiber 721 mm.
- the separated harmonics are emitted from the first harmonic propagation optical fiber 724.
- the second fundamental wave propagation optical fiber 721 of the second-stage wavelength conversion module 702 is connected to the first fundamental wave propagation optical fiber 732 of the termination wavelength conversion module 703, 2
- the residual fundamental wave generated in the stage wavelength conversion module 702 can be incident on the wavelength conversion element 733 of the termination wavelength conversion module 703.
- the second-stage wavelength conversion module 702 and the third-stage wavelength conversion module 7003 are connected. Then, a part of the residual fundamental wave generated by the second-stage wavelength conversion module 702 is wavelength-converted into harmonics by the wavelength conversion element 733 of the termination wavelength conversion module 703.
- the harmonics and the residual fundamental wave that remains without wavelength conversion are the first It enters the harmonic propagation optical fiber 734 and propagates. Then, in the first harmonic propagation optical fiber 734, the residual fundamental wave is consumed, and the harmonic is emitted from the first harmonic propagation optical fiber 734.
- the harmonic propagation optical fibers 714, 724, and 734 may be combined into a single fiber and output harmonics by using a complier or bundle fiber.
- the first fundamental wave propagation optical fiber and the second fundamental wave propagation optical fiber need to be linearly polarized when inputting the fundamental wave to the wavelength conversion element.
- a wave retaining fiber is preferred.
- the polarized light whose wavelength is converted by the even-numbered wavelength conversion module and the polarized light whose wavelength is converted by the odd-numbered wavelength conversion module are made perpendicular, or the optical axis of the wavelength converting element is tilted 45 degrees.
- a general single mode fiber may be used as the fundamental wave propagation fiber.
- a multi-stage wavelength conversion module 710 formed by combining a plurality of wavelength conversion modules 610 does not require a large space as compared to a conventional wavelength conversion apparatus that uses a plurality of wavelength conversion elements and is multi-staged. Optical adjustment is also easy. That is, in the wavelength conversion module 610, since light is input / output through the optical fiber, the wavelength conversion element alignment can be completed when the wavelength conversion module 610 is assembled. In addition, the alignment at the time of connecting a plurality of wavelength conversion modules requires the alignment at the time of fusing the optical fiber, but the fusion of the optical fiber can be easily performed by the optical fiber fusion splicer. . Therefore, installation and replacement are very easy. In addition, since the alignment of the wavelength conversion element in the wavelength conversion module 610 is adjusted and fixed at the time of manufacture, the alignment does not shift and the reliability of the wavelength conversion means is improved. Furthermore, since the number of parts can be reduced, manufacturing costs can be reduced.
- the laser light source device including the wavelength conversion module described in the first to fourth embodiments includes a display light source for a laser display (two-dimensional image display device), a liquid crystal display, and the like. It can be used as a light source for backlight of a ray apparatus or a laser light source for processing of a laser processing apparatus. In addition, it can be suitably used for various applications where laser light has been conventionally used, such as optical disk devices and measuring devices. For example, when the laser light source device is used for an optical disk device, a stable and high output with high coherence can be obtained, which is also effective for hologram recording.
- the laser light source device can also be used as an illumination light source. If a fiber laser is used as the fundamental wave light source, the conversion efficiency is high, so that high-efficiency conversion of electricity to light is possible.
- a fiber laser is used as the fundamental wave light source, the conversion efficiency is high, so that high-efficiency conversion of electricity to light is possible.
- an optical fiber by using an optical fiber, light can be transmitted to a remote place with low loss. As a result, it is possible to illuminate the room by generating light centrally by generating light at a specific location and sending light to a remote location.
- fiber lasers are effective for light distribution because they can be coupled with fibers with low loss.
- the configuration of a laser display (two-dimensional image display device) to which the laser light source device is applied An example will be described with reference to FIG.
- laser light sources 901a to 901c of three colors of red (R), green (G), and blue (B) were used.
- a GaAs semiconductor laser with a wavelength of 638 nm is used for the red laser light source 901a
- a GaN semiconductor laser with a wavelength of 465nm is used for the blue laser light source 901c.
- the green laser light source 901b uses a wavelength conversion green light source device including a wavelength conversion element that changes the wavelength of the infrared laser to 1Z2.
- the first to fourth embodiments are used as this wavelength conversion green light source device.
- the laser light source device including the wavelength conversion module described in the embodiment can be used.
- Laser beams emitted from the respective light sources 901a, 901b, and 901c are scanned in a two-dimensional manner by reflection type two-dimensional beam scanning means 902a to 902c, and pass through a mirror 910a, a lens 910b, and a mirror 910c. After that, the diffusion plates 903a to 903c are irradiated. The laser beams of the respective colors scanned two-dimensionally on the diffusion plates 903a to 903c are guided to the two-dimensional spatial light modulators 905a to 905c after passing through the field lenses 904a to 904c.
- the image data is divided into R, G, and B, and each signal is input to the two-dimensional spatial light modulators 905a to 905c and multiplexed by the dichroic prism 906.
- a color image is formed.
- the combined image is projected onto the screen 908 by the projection lens 907.
- the diffusion plates 903a to 903c are arranged in front of the two-dimensional spatial modulation elements 905a to 905c as speckle noise removing units, and the speckle noise is reduced by swinging the diffusion plates 903a to 903c. be able to. You can use a lenticular lens as the speckle noise removal section!
- a structure in which 2 to 8 semiconductor laser outputs can be obtained with one fiber output by a force bundle fiber using one semiconductor laser for each color. It may be.
- the wavelength spectrum width is very broad, a few nm, and the generation of speckle noise can be suppressed by this wide spectrum.
- the two-dimensional spatial modulation elements 905a to 905c it is possible to use a reflective spatial modulation element (DMD mirror) in which ultra-small mirrors are integrated.
- DMD mirror Two-dimensional spatial modulation elements using a liquid crystal panel
- galvano Two-dimensional spatial modulation elements using mirrors and mechanical microswitches MEMS
- Reflective spatial modulation elements, MEMS, galvanometer mirrors, and the effect of polarization components on the light modulation characteristics are small!
- the optical fiber that propagates harmonics is a polarization-maintaining fiber such as a PANDA fiber. No need Force When using a two-dimensional spatial modulation element using a liquid crystal panel, it is desirable to use a polarization-maintaining fiber because the modulation characteristics and polarization characteristics are greatly related.
- the infrared light component which is a fundamental wave
- the infrared light component is higher than the emitted light. Since it is removed by the wave propagation optical fiber, it is possible to suppress the deterioration of the liquid crystal panel due to the infrared light component.
- the harmonic propagation optical fiber included in the wavelength conversion module of the laser light source device may be wound around a portion where the heat dissipation of the laser display device is high. I like it.
- FIG. 10A is a schematic configuration diagram of a laser display device configuration body 1004 including a laser display device 1001 and a speaker 1002, and FIG. 10B is a schematic cross-sectional view of the 10-10 ′ portion thereof.
- 1001 is a laser display device
- 1005 is a green laser light source
- 1002 is a speaker
- 1003 is a speaker cylinder
- 1004 is a laser display device component.
- Reference numeral 203 denotes a harmonic propagation fiber derived from the green laser light source device 1005.
- the harmonic propagation fiber 203 When the harmonic propagation fiber 203 has a curved portion with a small radius of curvature, the energy of the residual fundamental wave is easily radiated at the curved portion. Therefore, heat dissipation can be enhanced by winding the harmonic propagation fiber 203 around a predetermined cylindrical portion in the laser display device structure 1004.
- the harmonic propagation optical fiber 203 from which the green laser light source device 1005 is also derived is wound around the speaker cylinder 1003 and then introduced into the laser display device 1001 as shown in FIG. 10A. The situation is shown.
- the harmonic propagation optical fiber 203 By attaching the harmonic propagation optical fiber 203 to the speaker cylinder 1003, it is possible to efficiently dissipate heat using the sound pressure generated by the speaker.
- the generated heat is also efficiently dissipated by placing the harmonic propagation optical fiber 203 inside the casing of the laser display device 1004.
- FIG. 11 shows the color reproduction range and the S-RGB standard color reproduction range when 530 nm laser light is selected as the green light of such a laser display device. It can be seen that the color reproduction range shift when 530 nm laser light is selected as green light is wider than the S-RGB standard color reproduction range that can be reproduced with a conventional image display device.
- the laser display device of the present embodiment can reproduce a high-definition image by using the laser light source device as the light source.
- the green laser light source device used in the laser display device of the present embodiment is preferably a fiber laser light source (Yb-doped fiber laser) supplemented with Yb.
- a fiber laser light source Yb-doped fiber laser
- green light having a wide wavelength range of 520 to 550 nm can be generated. Therefore, when a Yb-doped fiber laser is used, the color reproduction range can be further expanded.
- the laser light source device may employ a form (rear projection display) that projects from behind the screen.
- the laser light source device including the wavelength conversion module described in the first embodiment to the fourth embodiment can also be used as a light source for backlight of a liquid crystal display device. If the laser light source device is used as a light source for backlight, a liquid crystal display device with high efficiency and high brightness can be realized. Further, when such a laser light source device is used as a light source for backlight, it contributes to maintaining a high response speed by diverging the energy of the residual fundamental wave from the optical fiber and keeping the liquid crystal display unit warm.
- the liquid crystal panel has an infrared light component. It is possible to suppress deterioration due to.
- FIG. 12A shows a schematic configuration diagram of a liquid crystal display device 1108 using the laser light source device as a backlight light source.
- the liquid crystal display device 1108 includes a set of multi-stage wavelength conversion modules that perform the same operation on the left and right, but the multi-stage provided on the left side of the liquid crystal display device 1108 to simplify the description. Only the operation of this wavelength conversion module will be described using the enlarged schematic diagram of Fig. 12B.
- the coupled wavelength conversion module provided on the right also operates in the same way.
- 1101 is a liquid crystal display unit
- 1105a and 1110a are first-stage wavelength conversion modules
- 1105b and 1110b are second-stage wavelength conversion modules.
- a liquid crystal driving terminal 1107 for controlling a display image by applying a voltage is provided.
- a light guide plate (not shown) is provided on the back surface of the liquid crystal display unit 1101.
- the first-stage wavelength conversion modules 1105a and 1110a, the second-stage wavelength conversion module Eunole 1105b and 11 lObi, and the rim 1102 are collected.
- an infrared absorbing material such as black alumite is preferably used in the vicinity of the rim 1102 where the wavelength conversion module is disposed. This is to prevent deterioration of the liquid crystal material due to the incidence of infrared light on the liquid crystal panel.
- the first-stage wavelength conversion module 1105a shown in FIG. 12B includes a first wavelength conversion element 1120, a first fundamental wave propagation optical fiber 1106, a second fundamental wave propagation optical fiber 1104, and a first The higher harmonic propagation optical fiber 1115 is optically coupled.
- the second-stage wavelength conversion module 1105b includes the second wavelength conversion element 1130 and the first fundamental wave propagation.
- An optical fiber 1124, a second fundamental wave propagating optical fiber 1114, and a second harmonic wave propagating optical fiber 1116 are optically coupled.
- the second fundamental wave propagation optical fiber 1104 of the first-stage wavelength conversion module 1105a and the first fundamental wave propagation optical fiber 1124 of the second-stage wavelength conversion module 1105b are optically coupled.
- the fundamental wave emitted from the laser light source L 1 is introduced from the fundamental wave introduction unit 1106 and propagates through the first fundamental wave propagation optical fiber 1106. Then, the light enters the wavelength conversion element 1120 of the first-stage wavelength conversion module 1105a.
- the incident fundamental wave is partly converted to the second harmonic and emitted from the first harmonic propagation optical fiber 1115, and the residual fundamental wave is emitted from the first wavelength conversion element 1120,
- the light propagates through the second fundamental wave propagation optical fiber 1104 and the first fundamental wave propagation optical fiber 1124 and enters the wavelength conversion element 1130 of the second-stage wavelength conversion module 1105b.
- a part of the fundamental wave incident on the second wavelength conversion element 1130 is converted into the second harmonic and is emitted from the second harmonic propagation optical fiber 1116.
- the residual fundamental wave exits from the second wavelength conversion element 1130, propagates through the third fundamental wave propagation optical fiber 1114, and reaches the termination unit 1103.
- the first harmonic propagation optical fiber 1115 and the second harmonic propagation optical fiber 1116 are the green light that is also emitted from the second harmonic
- the second harmonic is an optical system having a combination force of an aspheric lens and a Fresnel lens. It is shaped into a sheet beam by Rl and R2 and input to the light guide plate to irradiate the liquid crystal panel uniformly.
- the residual fundamental wave emitted from the second wavelength conversion element 1130 propagates through the second fundamental wave propagation optical fiber 1114 coupled with the second wavelength conversion element 1130, and the second fundamental wave It reaches a terminal end 1103 coupled to the end of the wave propagation optical fiber 1114.
- the second fundamental wave propagating optical fiber 1114 is formed in a wavy shape such that the height of each mountain gradually decreases as it approaches the terminal end 1103.
- the energy of the residual fundamental wave that cannot be fully dispersed by the second fundamental wave propagation optical fiber 1114 may be processed by the terminal portion 1103 formed by the material cover having excellent heat dissipation. .
- FIG. 12A two wavelength conversion modules are connected as the light source for the knock light.
- the number of coupled wavelength conversion modules and the number of pairs can be appropriately selected according to the area of the liquid crystal display device and the like.
- a laser light source device using the laser light source device (green light: wavelength around 530 nm) is used as the processing laser light source 1301, and laser drawing suitable for copper calorie such as a printed circuit board. It is a processing device.
- the configuration of the processing laser light source 1301 is the same as that of the laser light source device including the wavelength conversion module described in the first to fourth embodiments, and thus detailed description thereof is omitted.
- the green light emitted from the processing laser light source 1301 is collimated by the assembled lens 1302. After that, the beam diameter is adjusted through the slit 1303, and the optical axis is turned back by the mirror 1304 or the like, and then guided to the galvanometer mirrors 1306 a and 1306 b through the lens 1305.
- the galvanometer mirrors 1306a and 1306b move the optical axis of the laser beam in the carriage direction (x direction or y direction), and then perpendicular to the caloric workpiece 1308 attached to the xy stage 1309 by the f ⁇ lens 1307.
- the beam is incident on the substrate, and the desired processing is performed.
- the wavelength range of the laser beam used for processing is desirably a wavelength range of up to 600 nm that can be used for fusion of resin as much as 400 nm that can be used for mastering optical disks.
- Harmonic light emitted from the harmonic propagation optical fiber 203 is collected immediately before the workpiece.
- the beam shaping optical system such as the combination lens 1302 and the slit 1303 and the galvanometer mirror 13 06a, 1306b, f- ⁇ lens 1307 are not required. Therefore, the device can be greatly reduced in size and cost can be reduced. Power! ] Since the f- ⁇ lens 1307 has temperature characteristics, it is necessary to keep the temperature of the room to be used constant, and to manage the characteristic profile of the lens. This makes it unnecessary to manage such light, which improves reliability and convenience. [0115] Conventionally, a laser light source using an LBO (lithium trivolate HLiB 2 O;) crystal has been used as a laser light source used in such a laser carriage apparatus. But LBO crystal
- the wavelength conversion module as described in the first to fourth embodiments converts the wavelength of the fundamental wave from which the fiber laser force is also emitted.
- the wavelength conversion module, laser light source device, two-dimensional image display device, backlight light source, liquid crystal display device, and laser processing device exemplified in each of the above embodiments are merely examples, and other aspects. It goes without saying that it is possible to take
- one aspect of the present invention is the first fundamental wave propagation optical fiber for propagating the fundamental wave emitted from the laser light source, the first fundamental wave propagation optical fiber, and the optical fiber.
- the first wavelength converting element force includes a first harmonic propagation optical fiber for propagating the emitted harmonics, and the core diameter of the first harmonic propagation optical fiber is the first basic It is a wavelength conversion module characterized by being smaller than the core diameter of a wave propagation optical fiber.
- the energy loss of the residual fundamental wave in the harmonic propagation optical fiber is increased, and the energy of the residual fundamental wave is consumed.
- the energy of the residual fundamental wave is consumed in the harmonic propagation optical fiber, thereby reducing the energy of the residual fundamental wave without using a large heat dissipation means, even when obtaining high-engineering harmonics. Can be made.
- a core diameter of the first harmonic propagation optical fiber is not more than 0.9 times a core diameter of the first fundamental wave propagation optical fiber. If the core diameter of the first harmonic propagation optical fiber is not more than 0.9 times the core diameter of the first fundamental propagation optical fiber, the propagation loss of the residual fundamental wave will be significantly higher. The residual fundamental wave can be sufficiently lost in the first harmonic propagation optical fiber.
- the wavelength conversion module includes a harmonic and a residual fundamental wave emitted from the first wavelength conversion element between the first wavelength conversion element and the first harmonic propagation optical fiber. It is preferable to further include a beam splitter for separating. By using such a beam splitter, it is possible to separate the residual fundamental wave and the harmonics generated by wavelength conversion. Furthermore, by converting the wavelength of the separated residual fundamental wave, it is possible to obtain further harmonics and harmonics.
- the wavelength conversion module preferably further includes a second fundamental wave propagation optical fiber for propagating the residual fundamental wave separated by the beam splitter.
- the second fundamental wave propagation optical fiber By using the second fundamental wave propagation optical fiber, the residual fundamental wave can be easily propagated to other wavelength conversion modules.
- the wavelength conversion module further emits a second wavelength conversion element for converting the wavelength of the residual fundamental wave separated by the beam splitter into a harmonic, and the second wavelength conversion element.
- a second harmonic propagation optical fiber for propagating the harmonic is provided.
- the first harmonic propagation optical fiber has a predetermined radius of curvature. It is preferred to have a curved part with By using harmonic propagation light having a curved portion in this way, it is possible to further increase the residual fundamental wave loss in the optical fiber.
- a radius of curvature of the curved portion is 60 mm or less.
- the radius of curvature is less than 60mm, the loss of the residual fundamental wave in the optical fiber becomes much higher.
- At least one of the first fundamental wave propagation optical fiber and the first harmonic wave propagation optical fiber is preferably a polarization maintaining fiber.
- a polarization-maintaining fiber By using a polarization-maintaining fiber, only linearly polarized light along a specific crystal axis of the wavelength conversion element can be obtained.
- the first wavelength conversion element includes potassium potassium phosphate, lithium niobate having a congruent composition, lithium niobate having a stoichiometric composition, congruent fusion
- the lithium tantalate having a composition and the lithium tantalate having a stoichiometric composition are preferably at least one selected from the group forces of the specific force.
- the non-linear optical constant is large, and the point power is excellent in wavelength conversion efficiency.
- the molar concentration of magnesium oxide is 5.3 to 6.3 mol. ⁇ ⁇
- the first wavelength conversion element is a nonlinear optical single crystal in which a polarization structure is periodically inverted to obtain high conversion efficiency by quasi phase matching (QPM). Better ,.
- the wavelength conversion module has a wide wavelength range of harmonics from which it can be obtained that the laser light source is a Yb-doped fiber laser.
- the wavelength of the harmonic is broadly in the range of 520 to 550 nm, and the point power for obtaining green light in the range is also preferable.
- the temperature at the time of wavelength conversion of the first wavelength conversion element is 20 to 60 ° C so that power consumption can be reduced.
- a plurality of the wavelength conversion modules in the previous period are optically coupled in multiple stages.
- This is a wavelength conversion module characterized by coupling the first fundamental wave propagation optical fiber at the stage.
- the wavelength conversion module at the predetermined stage and the wavelength conversion module at the next stage are connected as described above, and the residual fundamental wave at the predetermined stage is used as the fundamental wave at the next stage.
- higher output harmonics can be obtained without wasting residual fundamental waves.
- one aspect of the present invention includes the wavelength conversion module, and the wavelength conversion module outputs laser light having an average output of 2 W or more and a wavelength of 200 to 800 nm.
- a laser light source device can be reduced in size because it does not require heat radiation means such as a large beam damper for processing the residual fundamental wave. Therefore, it can be applied to small consumer equipment such as a two-dimensional image display device.
- one aspect of the present invention is a two-dimensional image display comprising the laser light source device and displaying an image using laser light having an average output of 2 W or more emitted from the laser light source device.
- Such a two-dimensional image display device has a wide color reproduction range.
- the two-dimensional image display device has a two-dimensional spatial modulation element formed of a liquid crystal panel
- the deterioration of the liquid crystal material contained in the liquid crystal panel is suppressed by using the laser light source device. Can do.
- one aspect of the present invention includes the laser light source device, and illuminates a liquid crystal display unit using light emitted from the laser light source device and having an average output of 2 W or more emitted from the laser light source device.
- a backlight light source characterized by Wavelength conversion module power of such a backlight light source The liquid crystal display can be kept warm by diverging the energy of the residual fundamental wave generated from the optical fiber, contributing to maintaining a high response speed. To do.
- one aspect of the present invention is a liquid crystal display device including the backlight light source. In such a liquid crystal display device, deterioration of the liquid crystal material contained in the liquid crystal panel can be suppressed.
- one aspect of the present invention is a laser cartridge characterized by comprising the laser light source device and processing an object using laser light having an average output of 2 W or more emitted from the laser light source device. Device.
- Such a laser carriage apparatus is a laser drawing carriage apparatus suitable for copper power such as a printed circuit board.
- the wavelength conversion module of the present invention removes the residual fundamental wave after wavelength conversion using the optical loss possessed as a characteristic of the optical fiber. Therefore, the energy of the residual fundamental wave can be dispersed and released. As a result, large beam dampers and heat radiation fins are not required.
- optical fibers are used for input and output, it is easy to connect to the fiber laser device by fusing the fibers together and ensuring high reliability because there is no misalignment. .
- the apparatus is simplified, the number of wavelength conversion modules can be increased without complicated adjustment, and the number of parts can be reduced, so that the manufacturing cost can be reduced.
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Lasers (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007539960A JP4837671B2 (ja) | 2005-10-12 | 2006-10-11 | 波長変換モジュール、レーザ光源装置、2次元画像表示装置、バックライト光源、液晶ディスプレイ装置及びレーザ加工装置 |
US12/090,064 US7692848B2 (en) | 2005-10-12 | 2006-10-11 | Wavelength conversion module, laser light source device, two-dimensional image display device, backlight light source, liquid crystal display device and laser processing device |
CN2006800380108A CN101288024B (zh) | 2005-10-12 | 2006-10-11 | 波长变换模块、激光源装置、二维图像显示装置、背光光源、液晶显示装置以及激光加工装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-297459 | 2005-10-12 | ||
JP2005297459 | 2005-10-12 |
Publications (1)
Publication Number | Publication Date |
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WO2007043560A1 true WO2007043560A1 (ja) | 2007-04-19 |
Family
ID=37942792
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2006/320266 WO2007043560A1 (ja) | 2005-10-12 | 2006-10-11 | 波長変換モジュール、レーザ光源装置、2次元画像表示装置、バックライト光源、液晶ディスプレイ装置及びレーザ加工装置 |
Country Status (4)
Country | Link |
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US (1) | US7692848B2 (ja) |
JP (1) | JP4837671B2 (ja) |
CN (1) | CN101288024B (ja) |
WO (1) | WO2007043560A1 (ja) |
Cited By (3)
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WO2011132385A1 (ja) * | 2010-04-20 | 2011-10-27 | パナソニック株式会社 | レーザ光源及びレーザ加工機 |
WO2021214897A1 (ja) * | 2020-04-22 | 2021-10-28 | 日本電信電話株式会社 | 波長変換装置 |
WO2022018845A1 (ja) * | 2020-07-22 | 2022-01-27 | 日本電信電話株式会社 | 波長変換装置 |
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US8038305B2 (en) * | 2007-02-07 | 2011-10-18 | Seiko Epson Corporation | Light source unit, illumination device, image display apparatus, and monitor apparatus |
US8144391B2 (en) * | 2007-09-03 | 2012-03-27 | Panasonic Corporation | Wavelength converter, image display and machining apparatus |
US8050302B2 (en) * | 2007-12-07 | 2011-11-01 | Panasonic Corporation | Wavelength conversion laser light source, laser light source device and two-dimensional image display device adopting the same, and method of setting temperature of wavelength conversion element |
US8179934B2 (en) * | 2008-05-12 | 2012-05-15 | Ipg Photonics Corporation | Frequency conversion laser head |
US20090303572A1 (en) * | 2008-06-06 | 2009-12-10 | Texas Instruments Incorporated | Speckle reduction in imaging applications and an optical system thereof |
JP5106309B2 (ja) * | 2008-08-07 | 2012-12-26 | 三菱電機株式会社 | 投写型表示装置 |
JP5753718B2 (ja) * | 2011-03-31 | 2015-07-22 | 株式会社フジクラ | 光デリバリ部品、及び、それを用いたレーザ装置 |
US20120300024A1 (en) * | 2011-05-25 | 2012-11-29 | Microsoft Corporation | Imaging system |
JP5964621B2 (ja) * | 2012-03-16 | 2016-08-03 | 株式会社ディスコ | レーザー加工装置 |
JP7105639B2 (ja) | 2018-07-05 | 2022-07-25 | 浜松ホトニクス株式会社 | レーザ加工装置 |
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Also Published As
Publication number | Publication date |
---|---|
US20090279017A1 (en) | 2009-11-12 |
JP4837671B2 (ja) | 2011-12-14 |
JPWO2007043560A1 (ja) | 2009-04-16 |
US7692848B2 (en) | 2010-04-06 |
CN101288024B (zh) | 2012-08-22 |
CN101288024A (zh) | 2008-10-15 |
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