WO2011127664A1 - 一种激光产生装置和方法 - Google Patents

一种激光产生装置和方法 Download PDF

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Publication number
WO2011127664A1
WO2011127664A1 PCT/CN2010/071842 CN2010071842W WO2011127664A1 WO 2011127664 A1 WO2011127664 A1 WO 2011127664A1 CN 2010071842 W CN2010071842 W CN 2010071842W WO 2011127664 A1 WO2011127664 A1 WO 2011127664A1
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Prior art keywords
light
laser
fundamental
mirror
frequency
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PCT/CN2010/071842
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English (en)
French (fr)
Inventor
闫国枫
陈昱
Original Assignee
青岛海信电器股份有限公司
青岛海信信芯科技有限公司
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Application filed by 青岛海信电器股份有限公司, 青岛海信信芯科技有限公司 filed Critical 青岛海信电器股份有限公司
Priority to CN201080066241.6A priority Critical patent/CN102870295B/zh
Priority to PCT/CN2010/071842 priority patent/WO2011127664A1/zh
Publication of WO2011127664A1 publication Critical patent/WO2011127664A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
    • H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
    • H01S3/109—Frequency multiplication, e.g. harmonic generation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
    • H01S3/082—Construction or shape of optical resonators or components thereof comprising three or more reflectors defining a plurality of resonators, e.g. for mode selection or suppression

Definitions

  • This invention relates to laser technology, and more particularly to a laser processing apparatus, method and laser display light source. Background technique
  • the laser has the characteristics of good monochromaticity, strong directivity and high brightness.
  • the core of laser technology is lasers. There are many types of lasers, which can be classified according to different methods such as working substances and working wavelengths.
  • Laser display technology is one of the main application directions of lasers. It has the characteristics of large color gamut and low energy consumption, and is considered as the next generation mainstream display technology.
  • the output power of the frequency doubled laser is unstable, and even the power fluctuation is relatively large, mainly because the fundamental frequency light of different frequencies is multiplied, because The mutual saturation effect between modes causes the competition of the fundamental frequency light between different frequencies, which causes the gain intensity of the fundamental frequency light to change when the gain is obtained, so that the output power of the frequency doubled light fluctuates, that is, the so-called green light problem.
  • the length of the mirror cavity can be changed, for example, increasing the length of the mirror cavity to increase the longitudinal modulus, or shortening the length of the mirror cavity to reduce the longitudinal modulus, but the above-mentioned long mirror cavity method and short mirror
  • the cavity method excessively defines the mirror cavity length of the laser, which brings many limitations to the design of the laser.
  • the self-stabilizing system can also be used to control the output, but the method increases the production cost of the laser. Summary of the invention
  • a laser processing apparatus comprising:
  • a chamber the input end of the chamber receives pump light; a laser crystal and a wavelength conversion unit are disposed in the chamber, and the laser crystal is excited by the pump light to generate fundamental light, and the wavelength conversion unit The fundamental light is wavelength-converted to output a laser;
  • a first cavity mirror is disposed between the laser crystal and the wavelength conversion unit, and the first cavity mirror is configured to partially transmit the fundamental frequency light;
  • the input end of the chamber is highly transmissive to the pump light, highly reflective to the fundamental light, and/or highly reflective to the laser;
  • the output of the chamber is highly reflective to the fundamental light and/or highly transmissive to the laser.
  • a first cavity mirror in the laser processing device partially transmissive to the fundamental light
  • the input coupling mirror and the output coupling mirror are highly reflective to the fundamental frequency light, such that the mirror cavity between the input coupling mirror and the first cavity mirror and the output a mirror cavity between the coupling mirror and the first cavity mirror forms a standing wave field of the fundamental frequency light, and the wavelength interval of the fundamental frequency light is increased due to the interaction between the plurality of standing wave fields, after the gain
  • the relative light intensity of the fundamental light is the product of the relative light intensity of the fundamental light of the wavelength and the gain intensity of the laser working substance to the fundamental light, thereby further selecting the longitudinal mode of the fundamental light, greatly reducing the cavity
  • the number of longitudinal modes of the internal fundamental frequency light, and the fundamental frequency light of the single longitudinal mode can be obtained, thereby alleviating the green light problem and improving the power stability of the output frequency doubled light.
  • the first cavity mirror in the laser processing apparatus comprises:
  • the laser processing apparatus has the following beneficial effects:
  • the first cavity mirror can be selected with a partial light-transmissive film or a coated convex lens, a concave lens, a plane mirror, a cylindrical lens or an aspherical mirror.
  • the first cavity mirror type can be selected according to the required beam diameter of the fundamental light to meet different powers. With the requirements under the band.
  • the wavelength conversion unit is a combination of one or two or more sum frequency crystals, one or more double frequency crystals, or one or more sum frequency crystals and one or more frequency doubled crystals.
  • the laser processing device can obtain not only stable output frequency doubled light but also triple-frequency light with higher output power and higher frequency doubled laser by various combinations of frequency doubling crystal and sum frequency crystal, which is beneficial to expand the laser processing.
  • the use and function of the device increase the range of use of the laser processing device.
  • the wavelength conversion unit frequency doubling crystal comprises:
  • Potassium titanyl phosphate KTP crystal lithium borate LB0 crystal, barium metaborate BB0 crystal, barium borate BIB0 crystal, titanyl phosphate 4 such as RTP crystal, potassium arsenate KTA crystal, potassium dihydrogen phosphate KDP crystal, periodic pole Lithium niobate PPLN crystals and/or periodically poled potassium titanyl phosphate PPKTP crystals.
  • the wavelength conversion unit can use various frequency doubling crystals as described above, and the laser processing apparatus can flexibly select various frequency doubling crystals to obtain a frequency doubling laser of a desired frequency, including a frequency doubling laser, a triple doubling laser, and more times.
  • the frequency of the laser facilitates the generation and manufacture of the wavelength conversion unit, reducing the cost of the laser processing apparatus.
  • a laser processing apparatus is further provided, the laser processing apparatus further comprising:
  • the laser processing apparatus has the following beneficial effects:
  • the optical fiber beam diameter can be further changed by providing an optical lens between the intermediate mirror and the laser crystal, and an optical lens is disposed between the intermediate mirror and the frequency doubling crystal to further change the frequency doubled light.
  • the beam diameter improves the quality of the fundamental or multiplier light.
  • a laser processing apparatus is further provided, the laser processing apparatus further comprising:
  • the second cavity mirror partially transmits the fundamental light, and the second cavity mirror is at least one piece disposed between the first cavity mirror and the laser crystal.
  • a laser display light source comprising: a pump light emitter that outputs pump light, and further comprising any of the laser processing devices described above.
  • the longitudinal mode of the fundamental light is further realized, the number of longitudinal modes of the fundamental frequency light in the cavity is greatly reduced, and the fundamental frequency light of the single longitudinal mode can be obtained, thereby alleviating
  • the green light problem improves the power stability of the output multiplier light or multiple frequency light, and can obtain multiplier light and multiple frequency light of various diameters.
  • a laser processing method including: receiving pump light; exciting pump light to generate fundamental light;
  • the receiving end of the pump light is highly transmissive to the pump light, highly reflective to the fundamental light, and/or highly reflective to the laser light;
  • the output of the laser is highly reflective to the fundamental light and/or highly transmissive to the laser.
  • the fundamental frequency light is partially and partially reflected to form a standing wave field of a plurality of fundamental frequency lights, and the wavelength interval of the fundamental frequency light is increased due to the interaction between the plurality of standing wave fields, and the gain is increased.
  • the relative light intensity of the fundamental light is the product of the relative light intensity of the fundamental light of the wavelength and the gain intensity of the laser working substance to the fundamental light, thereby further selecting the longitudinal mode of the fundamental light, which greatly reduces the The number of longitudinal modes of the fundamental frequency light in the cavity can be obtained, and the fundamental light of the single longitudinal mode can be obtained, thereby alleviating the green light problem and improving the power stability of the output frequency doubled light.
  • a laser processing method wherein the partially transmitted fundamental light is passed through a film-coated or plated convex lens, an IHJ lens, a plane mirror, a cylindrical lens or an aspheric mirror.
  • the fundamental frequency light is partially transmitted.
  • the partial transmission of the fundamental light is partially transmitted by a film-coated or plated convex lens, an IHJ lens, a plane mirror, a cylindrical lens or an aspherical mirror, and the model of the first cavity mirror can be selected according to the required beam diameter of the fundamental light to satisfy the difference. Power and band requirements.
  • a laser processing method wherein the filtering the fundamental wavelength light wavelength conversion output laser comprises:
  • the baseband light is wavelength converted by providing one or two or more sum frequency crystals, one or more frequency doubling crystals, or a combination of one or more sum frequency crystals and one or more frequency doubling crystals.
  • FIG. 1 is a schematic structural view of a laser processing apparatus according to an embodiment of the present invention.
  • FIG. 2 is a relative intensity diagram of fundamental light in the standing wave field 1 according to an embodiment of the present invention
  • FIG. 3 is a relative intensity diagram of fundamental light in the standing wave field 2 in the embodiment of the present invention.
  • FIG. 5 is a relative light intensity diagram of a fundamental frequency light after gain in an embodiment of the present invention.
  • FIG. 6 is a schematic structural view of a laser processing apparatus according to another embodiment of the present invention.
  • Figure 7 is a diagram showing the relative intensity of fundamental light in the standing wave field 3 in another embodiment of the present invention.
  • FIG. 8 is a relative intensity diagram of fundamental light in a standing wave field 4 according to another embodiment of the present invention.
  • FIG. 9 is a graph showing a gain intensity curve of a fundamental frequency light according to another embodiment of the present invention.
  • Figure 11 is a schematic structural view of a laser processing apparatus according to still another embodiment of the present invention.
  • FIG. 12 is a schematic structural view of a laser processing apparatus according to still another embodiment of the present invention.
  • FIG. 13 is a relative intensity diagram of fundamental light in the standing wave field 8 according to still another embodiment of the present invention.
  • Figure 14 is a diagram showing the relative intensity of fundamental light in the standing wave field 9 in still another embodiment of the present invention.
  • 15 is a gain intensity curve of a fundamental frequency light according to still another embodiment of the present invention.
  • 16 is a relative intensity diagram of fundamental light after gain in still another embodiment of the present invention.
  • Figure 17 is a schematic structural view of a laser processing apparatus according to still another embodiment of the present invention.
  • FIG. 18 is a schematic structural view of a laser display light source according to an embodiment of the present invention.
  • FIG. 19 is a flow chart of a laser processing method according to an embodiment of the present invention. detailed description
  • FIG. 1 is a schematic structural view of a laser processing apparatus according to an embodiment of the present invention.
  • the laser processing apparatus of the embodiment of the present invention may include:
  • the wavelength conversion unit may be a frequency doubling crystal 105.
  • a first cavity mirror 104 is disposed between the laser crystal 103 and the wavelength conversion unit in the chamber for high reflection of the frequency-doubled light or multiple frequency light, and partial reflection of the fundamental frequency light to respectively input the coupling mirror
  • the mirror cavity 1 between the mirror cavity 102 and the first cavity mirror 104 and the mirror cavity 2 between the output coupling mirror 106 and the first cavity mirror 104 form a standing wave field of the fundamental light;
  • the input end of the chamber may be an input coupling mirror 102, and the output end of the chamber may be an output coupling mirror 1
  • a sealed housing is further provided for hermetically enclosing the chambers composed of the input coupling mirror 102, the laser crystal 103, the first cavity mirror 104, the frequency doubling crystal 105 and the output coupling mirror 106;
  • the pumping device 101 uses a laser diode that generates 808 nm of pump light as the pumping device, and the pumping light generated by the pumping device 101 typically also includes noise pumping light of other frequencies;
  • the pump light enters the laser crystal through the input coupling lens 102 of the chamber, and can be plated on the side adjacent to the input coupling mirror 102 and the pump device 101 to transmit light to the 808 nm pump light (H i gh Transmi ss Ion, HT) optical medium, and the other side of the input coupling mirror 102 is plated with a pair of 808 nm pump light anti-reflection (Ant i- Ref lect ion, AR) and fundamental light and multiplier light high reflection ( The optical medium of High Ref lectanc e , HR), the optical medium layer may be a layer of optical medium, or may comprise a plurality of sub-layer optical medium layers;
  • the laser crystal 103 is irradiated with 5mm doped 0. 8% Nd ion YV04 crystal after 808nm pump light, spontaneous radiation and stimulated radiation, output 1064 legs of fundamental light, the fundamental light passes through the input coupling mirror The reflection between the 102 and the output coupling mirror 106 is repeatedly oscillated by the laser crystal 103 to gain a gain of the fundamental light beam;
  • the frequency doubling crystal 105 ⁇ uses a 10mm KTP crystal, and the fundamental frequency light of 1064 is multiplied to 532 to make the frequency doubled light;
  • the side of the output coupling mirror 106 adjacent to the first cavity mirror 104 is plated with a layer of high-reflection HR and Double-frequency light and high-transmission HT optical medium, so that the fundamental frequency light is multiplied by the frequency doubling crystal, and the frequency-doubled light is transmitted in time to reduce the loss of the fundamental frequency and the frequency-doubled light;
  • the space between the first cavity mirror 104 and the input coupling mirror 102 is the mirror cavity 1.
  • the space between the first cavity mirror 104 and the output coupling mirror 106 is the mirror cavity 2, and the lengths of the mirror cavity 1 and the mirror cavity 2 are respectively L1.
  • v is the frequency of the fundamental frequency of the standing wave field
  • c is the speed of light in the vacuum
  • n is the refractive index of the gas in the mirror cavity
  • L is the length of the mirror cavity
  • Equation (2) is as follows:
  • each laser crystal For the gain intensity of the fundamental light of frequency v, ⁇ is the gain bandwidth, V.
  • each laser crystal For the center frequency of the fundamental light of the gain, each laser crystal has its own unique gain center frequency, which is the intermediate value of the gain curve and the frequency of the fundamental light with the highest gain intensity;
  • the fundamental light has a wavelength of 1064, and is plated on both sides of the first cavity mirror 104 with a partial wavelength transmission (Part Transmission, PT) for the fundamental light 1064 and a high frequency reflection for the wavelength 532.
  • Part Transmission, PT partial wavelength transmission
  • the optical medium, the transmittance of the first cavity mirror 104 to the wavelength portion of the fundamental frequency light 1064 can be set according to the actual situation, to meet the conditions for forming the standing wave field of the fundamental frequency light, for example, the transmittance can be set.
  • Between 5-50%, in the mirror cavity 1 and the mirror cavity 2 respectively form a standing wave field 1 and a standing wave field 2 comprising a plurality of frequencies of fundamental frequency light;
  • the input coupling mirror 101 and the output coupling mirror 106 are used as a plane mirror, and the first cavity mirror 104 is a convex lens with a focal length of 25 mm.
  • the first cavity mirror 104 can not only partially perform the fundamental light. Transmission, but also the beam diameter of the fundamental light that is oscillated by the laser crystal;
  • the first cavity mirror 104 can also change the beam diameter and the like of the fundamental light by using a convex lens or a concave lens, and the first cavity mirror can also be a plane mirror, a concave mirror or a convex mirror with a part of the light transmissive film or plating layer.
  • various aspherical mirrors as long as the first mirror of the above model has a function of partially transmitting the fundamental light, at least two standing wave fields can be realized.
  • the L1 is set to 64. 5mm
  • the L2 is set to 29mm.
  • FIG. 2 is a relative intensity diagram of the fundamental frequency light in the standing wave field 1 according to the embodiment of the present invention
  • FIG. 3 is in the embodiment of the present invention.
  • the relative intensity map of the fundamental frequency light in the standing wave field 2 the relative light intensity of the fundamental frequency light of the standing wave field 1 and the standing wave field 2 are shown in Fig. 2 and Fig. 3, respectively, the length of the mirror cavity and the standing wave field.
  • the relationship between the wavelengths of the fundamental light can be calculated by the prior art and will not be described here.
  • FIG. 4 is a diagram showing the relationship between the fundamental frequency light and its gain intensity in the embodiment of the present invention, and the fundamental wavelength light of the same wavelength in the standing wave field 1 and the standing wave field 2 will be in the laser crystal 102 according to the gain intensity as shown in FIG. The gain is obtained, and the gain intensity curve of the fundamental light is a Lorentz curve.
  • FIG. 5 is a relative intensity diagram of the fundamental light after the gain in the embodiment of the present invention. As shown in FIG. 5, the fundamental light having the same wavelength in the standing wave field 1 and the standing wave field 2 is amplified by the laser crystal 102, and the relative light intensity of the fundamental light after the gain is the relative light of the wavelength in the standing wave field 1.
  • FIG. 6 is a schematic structural diagram of a laser processing device according to another embodiment of the present invention, as shown in FIG.
  • FIG. 7 is a standing wave field according to another embodiment of the present invention.
  • 3 is a relative intensity map of the fundamental light
  • FIG. 8 is a relative intensity diagram of the fundamental light in the standing wave field 4 according to another embodiment of the present invention, as shown in FIG. 7 and FIG. 8, not satisfying the formula (1)
  • the fundamental light of other wavelengths will be consumed, thereby reducing the longitudinal modulus of the fundamental light.
  • FIG. 9 is a graph showing the gain intensity of the fundamental light in another embodiment of the present invention, the standing wave field 3 and the standing wave field.
  • the fundamental wavelength light with the same wavelength will be amplified by the laser crystal 103 oscillation gain according to the gain intensity curve shown in Fig. 9.
  • the laser crystal 103 is wavelength-dependent due to the high loss design of 1064.
  • the gain intensity of the fundamental light of 912 is the highest
  • FIG. 10 is a relative intensity diagram of the fundamental light after gain in another embodiment of the present invention.
  • the gain intensity of the fundamental light having a wavelength of 912 nm is the largest, and the wavelength of the single longitudinal mode is 912, so that the fundamental frequency light is multiplied by the frequency doubling crystal 105, thereby obtaining a laser beam having a wavelength of 456 nm.
  • the problem of green light is avoided, so that power-stable double-frequency light can be obtained;
  • the optical lens 107 can be replaced with a second cavity mirror 104.
  • FIG. 11 is a schematic structural view of a laser processing device according to still another embodiment of the present invention.
  • the wavelength conversion unit includes a first cavity mirror 104 and a second cavity mirror 1 G4, and the second cavity mirror 1 G4 partially transmits the fundamental frequency light to the fundamental frequency light as the first cavity mirror 104.
  • the high frequency reflection of the frequency-doubled light and the pump light since the first cavity mirror 104 partially transmits and partially reflects the fundamental light, the standing wave can be formed in the mirror cavity 7 formed by the second cavity mirror 104 and the first cavity mirror 104.
  • the fundamental frequency light forming the standing wave in the standing wave field 7 satisfies the formula (1)
  • the mirror cavity 5 is formed between the second cavity mirror 104 and the input coupling mirror.
  • the length is L6, and the L6 is still 69.
  • the lmm mirror cavity 6 has a standing wave field 6 formed by the fundamental frequency light satisfying the formula (1), and the base of the same frequency in the standing wave field 5, the standing wave field 6, and the standing wave field 7.
  • the frequency light will be amplified by the laser crystal according to the gain intensity curve as shown in FIG.
  • the second cavity mirror 104 and the first cavity. 104 The partial reflectance of the fundamental light is based on the stable standing wave field formed in the mirror cavity 5, the mirror cavity 6 and the mirror cavity 7, and the relative intensity maps of the fundamental frequency light in the standing wave field 5 and the standing wave field 7 are
  • the relative intensity map of the fundamental light in the standing wave field 3 is the same, and the relative intensity map of the fundamental light in the standing wave field 6 is the same as the relative intensity map of the fundamental light in the standing wave field 4, and is no longer Narration.
  • FIG. 12 A schematic diagram of the structure of a laser processing apparatus according to still another embodiment of the present invention. As shown in FIG.
  • the wavelength conversion unit includes a frequency doubling crystal 156 and a matching and frequency crystal 205 frequency doubling crystal 156 and a matching and frequency crystal 205, respectively.
  • a frequency doubling crystal 156 and a matching and frequency crystal 205 frequency doubling crystal 156 and a matching and frequency crystal 205 respectively.
  • the first mirror 10 04 plating a pair of 532 let 355 For the high-reflection and optical medium for partially transmitting the fundamental light, the space between the input coupling mirror 102 and the first cavity mirror 104 is the mirror cavity 8, and the length L8 of the mirror cavity 8 is 75 ⁇ , the output coupling mirror The space between the 1 06 and the first cavity mirror 104 is the mirror cavity 9, and the length L9 of the mirror cavity 9 is 39 mm.
  • the standing wave field 8 and the standing wave field 9 are respectively formed in the mirror cavity 8 and the mirror cavity 9, respectively.
  • a relative intensity map of the fundamental frequency light in the standing wave field 8 in another embodiment of the present invention, 14 is a relative intensity diagram of the fundamental frequency light in the standing wave field 9 in still another embodiment of the present invention, wherein the standing wave field 8 is as shown in FIG. 13, and the standing wave field 9 is as shown in FIG.
  • the gain intensity curve of the fundamental frequency light, the fundamental wave light of the same wavelength in the standing wave field 8 and the standing wave field 9 is gained by the laser crystal 103 according to the gain intensity curve shown in FIG.
  • the relative light intensity of the fundamental light is the product of the relative light intensity of the wavelength in the standing wave field 8, the relative light intensity in the standing wave field 9, and the gain intensity, so that the whole cavity is obtained as shown in FIG.
  • FIG. 16 is a relative intensity diagram of the fundamental light after gain according to still another embodiment of the present invention.
  • the fundamental light of the single longitudinal mode passes through the frequency doubling crystal 105 and the sum frequency crystal 105'. Excited by triple frequency, a triple-frequency laser with a wavelength of 355 nm is obtained. By changing the type or number of frequency-doubling crystals, multiple times of frequency can be obtained, including quadruple frequency, five-fold frequency, and multiples of multiples. Light.
  • the laser crystal 103 is integrally formed with the input coupling mirror 102, and the frequency doubling crystal 105 and the output coupling mirror are integrally formed.
  • FIG. 17 is a laser processing apparatus according to still another embodiment of the present invention. Schematic diagram of the structure, as shown in FIG.
  • first cavity mirror 104 partially transmits the fundamental frequency light
  • the input coupling mirror 102 and the output coupling mirror 106 base light high reflection, in the first cavity mirror 104 and the input
  • the mirror cavity 10 between the coupling mirrors 102 forms a standing wave field of the fundamental frequency light
  • the mirror cavity 11 between the first cavity mirror 104 and the output coupling mirror 106 forms a standing wave field of the fundamental frequency light
  • an optical medium with high reflection of the fundamental frequency light is plated on the input coupling mirror 102
  • the output coupling mirror 106 is plated with a double layer. Frequency-optic or multi-frequency high-transmitting optical medium to enable high-efficiency emission of the multiplied laser beam;
  • an optical medium highly reflective to the fundamental light and highly transmissive to the pump light may be directly plated on the side adjacent to the laser crystal 103 and the pumping device 101, on the side of the output of the frequency doubling crystal 105.
  • An optical medium that reflects light at a fundamental frequency and is highly transmissive to frequency-doubled light or multiple frequency light is plated, thereby reducing the loss of fundamental light and the production cost of the laser processing apparatus.
  • the wavelength conversion unit may be a combination of one or two or more sum frequency crystals, or a combination of one or more frequency doubling crystals, or one or more sum frequency crystals and one or more.
  • the combination of the frequency doubling crystals is selected according to the frequency and power of the required frequency doubled light.
  • the partial transmission of the first cavity mirror can be realized by the coating technology of the optical medium in the prior art, and details are not described herein again; the corresponding wavelength conversion unit can be selected according to the actually required frequency-doubling light.
  • the wavelength conversion unit may also select bismuth metaborate BB0 crystal, bismuth borate BI B0 crystal, strontium titanate 4 such as RT P crystal, titanium arsenate.
  • Periodically polarized crystals such as oxy-potassium KTA crystal, potassium dihydrogen phosphate KDP crystal, periodically-polarized lithium niobate PPLN crystal, and periodically-polarized potassium titanyl phosphate PPKTP crystal, by setting different crystal types and quantities to obtain corresponding times Frequency or multiple frequency light.
  • the fundamental light is reflected in the mirror cavity on both sides of the first cavity mirror by plating an optical medium partially transmitting the fundamental light on the first cavity mirror.
  • the fundamental light with the same wavelength in each standing wave field will be strongly enhanced by the laser crystal.
  • the oscillation gain of the degree curve generally obtains a single-frequency fundamental frequency light in the entire resonant cavity, and the fundamental frequency light of the single frequency is multiplied by the frequency doubling crystal to obtain power-stable double-frequency light, and the embodiment of the present invention improves the frequency multiplication.
  • the power stability of light or multiple frequency light does not require much modification to existing laser processing equipment.
  • the laser display light source in the embodiment of the present invention includes a pump light emitter 101 and a laser processing device, and the pump light emitter is used for an output pump.
  • the laser processing device adopts the structure shown in FIG. 1 , and the laser processing device can also adopt other structures in the above embodiments, and details are not described herein again.
  • the laser display light source in the embodiment of the present invention can be applied to a laser display terminal such as a laser display television
  • the laser display television includes a pump light emitter, a laser processing device, and a display screen, and the pump light emission in the laser display television
  • the pump outputs light, and the input coupling lens 102 of the chamber in the laser processing device receives the pump light, and the pump light is absorbed by the laser crystal 103, and spontaneous radiation and stimulated radiation are generated, and the fundamental light is output, and the fundamental light is output.
  • the laser crystal 103 repeatedly oscillates the gain through the reflection between the input coupling mirror 102 and the output coupling mirror 106, and gradually gains the light of the fundamental light.
  • the space between the first mirror 104 and the input coupling mirror 102 is The space between the mirror cavity 1, the first cavity mirror 104 and the output coupling mirror 106 is the mirror cavity 2, and the transmittance of the first cavity mirror 104 to the fundamental light portion can be set according to the actual situation to meet the formation of the fundamental frequency.
  • the condition of the standing wave field of the light is normal, and the standing wave field 1 and the standing wave field 2 including the fundamental frequency light of various frequencies are respectively formed in the mirror cavity 1 and the mirror cavity 2, as shown in FIG.
  • the standing wave field 1 and the wavelength in the standing wave field 2 is the same
  • the fundamental light is amplified by the laser crystal 102, and the relative intensity of the gained fundamental light is the product of the relative intensity of the wavelength in the standing wave field 1, the relative intensity in the standing wave field 2, and the gain intensity. Since the frequency interval of the fundamental frequency light in the entire resonant cavity is increased, the number of fundamental light beams having the same wavelengths in the standing wave field 1 and the standing wave field 2 is small, and, because of the fundamental light of the laser crystal for different wavelengths
  • the gain intensity is in accordance with the Lorentz curve. Therefore, usually only the fundamental light of the gain center can be high gain, and the fundamental light of other wavelengths will be consumed, so that the fundamental light of the single longitudinal mode is selected, in FIG.
  • the fundamental frequency light having a wavelength of 1064 legs is highly gained, and the fundamental light of the single longitudinal mode is multiplied by the frequency doubling crystal 105. Since only the fundamental light of the single longitudinal mode is multiplied, the problem of green light is avoided, and power-stable doubled light can be obtained.
  • the wavelength of the doubled light is 532 nm, and the power stable doubled laser is used for display. The video image with stable brightness and sharpness is displayed on the screen, and the display effect of the video image of the laser display terminal such as the laser display television is improved.
  • FIG. 19 is a flow chart of a laser processing method according to an embodiment of the present invention. As shown in Fig. 19, the flow of the laser processing method may include the following steps:
  • Step 1901 partially transmitting the fundamental light.
  • a cavity mirror 104 partially and partially reflects the pump light received at the receiving end of the chamber, and then proceeds to step 1902.
  • Step 1902 Convert the partially transmitted fundamental frequency light to a laser output.
  • the pump light After the first cavity mirror 104 partially and partially reflects the pump light received at the receiving end of the chamber, the pump light will form a base light including a plurality of frequencies of the fundamental frequency in the mirror cavity 1 and the mirror cavity 2, respectively.
  • Wave field 1 and standing wave field 2 the fundamental light of the same wavelength in standing wave field 1 and standing wave field 2 will gain in the laser crystal 102 according to the gain intensity as shown in Fig. 4, and the gain intensity curve of the fundamental frequency light
  • the gain intensity of the laser crystal for the fundamental light of different wavelengths conforms to the Lorentz curve, usually only the fundamental light of the gain center can be high gain, and the fundamental light of other wavelengths will be consumed. Therefore, the fundamental light of the single longitudinal mode is selected.
  • the fundamental light of the single longitudinal mode is selected.
  • the partially transmitted fundamental light is partially transmitted to the fundamental light by a film-coated or plated convex lens, a concave lens, a plane mirror, a cylindrical lens or an aspherical mirror as the first cavity.
  • a combination of one or two or more sum frequency crystals, or a combination of one or more frequency doubling crystals, or one or more sum frequency crystals and one or more frequency doubling crystals The combination is chosen according to the frequency and power of the required multiplier light.
  • the embodiments, the technical solutions, and the beneficial effects of the present invention are further described in detail.
  • the embodiments described above are only specific embodiments of the present invention and are not intended to be limiting.
  • the scope of the present invention should be construed as being included in the scope of the present invention. Any modifications, equivalents, improvements, and the like are intended to be included within the scope of the present invention.

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Description

一种激光产生装置和方法
技术领域
本发明涉及激光技术， 特别涉及一种激光处理装置、 方法和激光显示光 源。 背景技术
激光具有单色性好、 方向性强、 亮度高等特点。 激光技术的核心是激 光器， 激光器的种类很多， 可按工作物质、 工作波长等不同方法分类。
如今， 激光技术已开始在电视、 微型投影、 商用和娱乐系统中找到了应 用。 而激光倍频技术则使现有激光频率得到了大幅度的扩充， 不仅实现了可 见光波段的激光输出， 更是利用三倍频、 四倍频技术实现了紫外波段的激光 输出。 激光显示技术是激光器的一个主要应用方向， 其具有大色域、 低能耗 等特点， 被认为是下一代主流显示技术。
在如下的文献中： CN200710120665. 6 , CN 200520073932. 5 , 还可以发现 更多与上述技术方案相关的信息.
但是， 在现有技术中在， 激光器在输出倍频激光时， 出现倍频激光的输 出功率不稳定的现象， 甚至功率波动比较大， 主要是因为不同频率的基频光 在倍频时， 由于模式之间的互饱和效应引起不同频率之间的基频光的竟争， 导致基频光在增益时增益强度发生变化， 使倍频光的输出功率发生波动， 即 所谓的绿光问题。
现有技术中可以通过改变镜腔的长度来解决， 例如增大镜腔的长度以增 加纵模数， 或缩短镜腔的长度以减少纵模数， 但是， 上述的长镜腔法和短镜 腔法都过多地限定了激光器的镜腔长度， 给激光器的设计带来了很多限制； 现有技术中还可以釆用自稳定系统控制输出， 但该方法增加了激光器的生产 成本。 发明内容
本发明实施例的目的是提供一种激光处理装置、 激光显示光源和激光处 理方法， 用于实现输出功率稳定的倍频激光。
一方面， 在一个实施例中， 提供了一种激光处理装置， 激光处理装置包 括：
腔室， 所述腔室的输入端接收泵浦光； 所述腔室内设置激光晶体、 波长 转换单元， 所述激光晶体经泵浦光激发后生成基频光， 所述波长转换单元将 所述基频光进行波长转换后输出激光；
所述激光晶体和波长转换单元之间设置第一腔镜， 所述第一腔镜用于部 分透射基频光；
所述腔室的输入端对所述泵浦光高透射， 对所述基频光高反射， 和 /或对 所述激光高反射；
所述腔室的输出端对所述基频光高反射和 /或对所述激光高透射。
该激光处理装置具备如下有益效果：
激光处理装置中的第一腔镜， 对基频光部分透射， 输入耦合镜和输出耦 合镜对基频光高反射， 从而在输入耦合镜和第一腔镜之间的镜腔以及所述输 出耦合镜和所述第一腔镜之间的镜腔形成所述基频光的驻波场， 由于多个驻 波场之间的相互作用， 增大了基频光的波长间隔， 增益后的基频光的相对光 强为该波长的基频光的相对光强与激光工作物质对该基频光的增益强度的乘 积， 实现了进一步对基频光的选纵模， 大大减少了谐振腔内基频光纵模的数 量， 并可以得到单纵模的基频光， 从而緩解了绿光问题， 提高了输出倍频光 的功率稳定性。
进一步的， 在上述激光处理装置的基础上， 还提供了一种激光处理装置， 该激光处理装置中的第一腔镜包括：
加部分透光膜或镀层的凸透镜、 IHJ透镜、 平面镜、 柱透镜或非球面镜。 该激光处理装置具备如下有益效果：
第一腔镜可以选择加部分透光膜或镀层的凸透镜、 凹透镜、 平面镜、 柱透 镜或非球面镜， 可以根据所需要的基频光的光束直径来选择第一腔镜的型号， 以满足不同功率与波段下的要求。
进一步的， 在上述激光处理装置的基础上， 还提供了一种激光处理装置， 该激光处理装置中：
所述波长转换单元是 1个或 2个及以上的和频晶体、 1个及以上的倍频晶 体、 或 1个及以上的和频晶体与 1个及以上的倍频晶体的组合。
该激光处理装置具备如下有益效果：
激光处理装置通过倍频晶体与和频晶体的各种组合， 不仅可以获得输出 功率稳定的倍频光， 可以获得输出功率稳定的三倍频光以及更高倍频的激光， 有利于扩大该激光处理装置的用途和功能， 提高该激光处理装置的使用范围。
进一步的， 在上述激光处理装置的基础上， 还提供了一种激光处理装置， 该激光处理装置中， 所述波长转换单元倍频晶体包括：
磷酸氧钛钾 KTP晶体， 三硼酸锂 LB0晶体、 偏硼酸钡 BB0晶体、 硼酸铋 BIB0 晶体、 磷酸氧钛 4如 RTP晶体、 砷酸钛氧钾 KTA晶体、 磷酸二氢钾 KDP晶体、 周期 性极化铌酸锂 PPLN晶体和 /或周期极化磷酸氧钛钾 PPKTP晶体。
该激光处理装置具备如下有益效果：
波长转换单元可以使用上述各种倍频晶体， 该激光处理装置可以灵活选 择各种不同的倍频晶体， 以获取所需要频率的倍频激光， 包括倍频激光、 三 倍频激光以及更多倍频的激光， 有利于该波长转换单元的生成制造， 降低了 该激光处理装置的成本。
进一步的， 在上述激光处理装置的基础上， 还提供了一种激光处理装置， 该激光处理装置中还包括：
光学透镜， 设置在所述第一腔镜和所述激光晶体之间， 和 /或设置在所述 第一腔镜和所述波长转换单元之间， 用于增大或减小所述激光的光束直径。 该激光处理装置具备如下有益效果：
通过在中间腔镜和所述激光晶体之间设置光学透镜，可以进一步改变基频 光光束直径， 通过所述中间腔镜和所述倍频晶体之间设置光学透镜， 以进一 步改变倍频光的光束直径， 改善基频光或倍频光的质量。
进一步的， 在上述激光处理装置的基础上， 还提供了一种激光处理装置， 该激光处理装置中还包括：
第二腔镜， 部分透射基频光， 所述第二腔镜至少为一片， 设置在所述第 一腔镜与所述激光晶体之间。
该激光处理装置具备如下有益效果：
不仅可以进一步改变基频光的光束直径， 而且还能在中间腔镜之间形成 另一个驻波场， 进一步减少了噪音基频光， 从而提高选择单纵模基频光的效 率和提高基频光的光束质量。
另一方面， 在一个实施例中， 提供一种激光显示光源， 该激光显示光源包 括： 输出泵浦光的泵浦光发射器， 还包括上述的任意一种激光处理装置。
该激光显示光源具备如下有益效果：
通过釆用上述任意一项激光显示光源， 实现了进一步对基频光的选纵模， 大大减少了谐振腔内基频光纵模的数量， 可以得到单纵模的基频光， 从而緩 解了绿光问题， 提高了输出倍频光或多倍频光的功率稳定性， 并可以得到各 种直径的倍频光和多倍频光。
另一方面， 提供了一种激光处理方法， 包括： 接收泵浦光； 激发泵浦光 生成基频光； 其中， 所述方法还包括：
部分透射基频光；
将部分透射后的基频光波长转换输出激光；
所述泵浦光的接收端对所述泵浦光高透射， 对所述基频光高反射， 和 /或 对所述激光高反射；
所述激光的输出端对所述基频光高反射和 /或对所述激光高透射。 本发明实施例通过将基频光部分透射和部分反射，以形成多个基频光的驻 波场， 由于多个驻波场之间的相互作用， 增大了基频光的波长间隔， 增益后 的基频光的相对光强为该波长的基频光的相对光强与激光工作物质对该基频 光的增益强度的乘积， 实现了进一步对基频光的选纵模， 大大减少了谐振腔 内基频光纵模的数量， 并可以得到单纵模的基频光， 从而緩解了绿光问题， 提高了输出倍频光的功率稳定性。
进一步的， 在上述激光处理方法的基础上， 还提供了一种激光处理方法， 其中， 所述部分透射基频光通过加膜或镀层的凸透镜、 IHJ透镜、 平面镜、 柱 透镜或非球面镜对所述基频光部分透射。
该激光处理方法具备如下有益效果：
通过加膜或镀层的凸透镜、 IHJ透镜、 平面镜、 柱透镜或非球面镜对所述基 频光部分透射， 可以根据所需要的基频光的光束直径来选择第一腔镜的型号， 以满足不同功率与波段下的要求。
进一步的， 在上述激光处理方法的基础上， 还提供了一种激光处理方法， 所述将过滤后的基频光波长转换输出激光包括：
设置 1个或 2个及以上的和频晶体、 一个及以上的倍频晶体、 或一个及以 上的和频晶体与一个及以上的倍频晶体的组合对所述基频光进行波长转换。
通过倍频晶体与和频晶体的各种组合， 不仅可以获得输出功率稳定的倍 频光， 可以获得输出功率稳定的三倍频光以及更高倍频的激光， 有利于扩大 该激光处理装置的用途和功能， 提高该激光处理装置的使用范围。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作简单地介绍， 显而易见地， 下面 描述中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动性的前提下， 还可以根据这些附图获得其他的附图。 在 附图中：
图 1为本发明实施例中激光处理装置的结构示意图；
图 2为本发明实施例中驻波场 1中基频光的相对光强图；
图 3为本发明实施例中驻波场 2中基频光的相对光强图；
图 4为本发明实施例中基频光与其增益强度的关系图；
图 5为本发明实施例中增益后的基频光的相对光强图；
图 6为本发明另一个实施例中激光处理装置的结构示意图；
图 7为本发明另一个实施例中驻波场 3中基频光的相对光强图；
图 8为本发明另一个实施例中驻波场 4中基频光的相对光强图；
图 9为本发明另一个实施例中基频光的增益强度曲线图；
图 10为本发明另一个实施例中增益后的基频光的相对光强图；
图 11为本发明再一个实施例中激光处理装置的结构示意图；
图 12为本发明又一个实施例中激光处理装置的结构示意图；
图 1 3为本发明又一个实施例中驻波场 8中基频光的相对光强图；
图 14为本发明又一个实施例中驻波场 9中基频光的相对光强图；
图 15为本发明又一个实施例中基频光的增益强度曲线；
图 16为本发明又一个实施例中增益后的基频光的相对光强图；
图 17为本发明又一个实施例中激光处理装置的结构示意图；
图 18本发明实施例中激光显示光源的结构示意图；
图 19为本发明实施例激光处理方法的流程图。 具体实施方式
下面通过附图和实施例， 对本发明的技术方案做进一步地详细描述。 图 1为本发明实施例中激光处理装置的结构示意图。 如图 1所示， 本发明 实施例的激光处理装置可以包括：
腔室，腔室的输入端接收泵浦光，腔室设置激光晶体 103和波长转换单元, 激光晶体 103将泵浦光激发后生成基频光， 波长转换单元将所述基频光进行波 长转换后输出激光， 波长转换单元可以是倍频晶体 105。
在腔室内的激光晶体 103和波长转换单元之间设置第一腔镜 104 , 用于对 倍频光或多倍频光进行高反射，以及对基频光进行部分反射， 以分别在输入耦 合镜 102和第一腔镜 104之间的镜腔 1与输出耦合镜 106和第一腔镜 104之间的 镜腔 2形成所述基频光的驻波场；
腔室的输入端可以为输入耦合镜 102 , 腔室的输出端可以为输出耦合镜 1
06 ；
进一步的， 还包括密闭外壳， 用于将输入耦合镜 102、 激光晶体 103、 第 一腔镜 104、 倍频晶体 105和输出耦合镜 106组成的腔室密闭封装起来；
一个实施例中， 泵浦装置 101釆用产生 808nm的泵浦光的激光二极管作为 泵浦装置， 泵浦装置 101产生的泵浦光通常也会包括有其它频率的噪音泵浦 光；
泵浦光透过腔室的输入耦合透镜 102进入激光晶体， 可以在输入耦合镜 10 2与泵浦装置 101相邻的侧面镀一层能对 808nm的泵浦光高透射（H i gh Transmi s s ion, HT)的光学介质， 而在输入耦合镜 102的另一侧镀一层对 808nm的泵浦 光抗反射（Ant i- Ref lect ion, AR)与基频光和倍频光高反射（High Ref lectanc e , HR)的光学介质， 上述的光学介质层可以为一层光学介质， 也可以包括多 个子层的光学介质层；
激光晶体 103釆用 5mm掺杂 0. 8%Nd离子的 YV04晶体吸收 808nm的泵浦光之 后发生自发辐射与受激辐射， 输出波长为 1064腿的基频光， 该基频光经过输 入耦合镜 102和输出耦合镜 106之间的反射而被激光晶体 103反复振荡增益， 逐 渐增益为基频光的光束；
倍频晶体 105釆用 10mm的 KTP晶体， 将 1064讓的基频光倍频激发为 532讓的 倍频光；
输出耦合镜 106与第一腔镜 104相邻的侧面镀一层对基频光高反射 HR和对 倍频光高透射 HT的光学介质， 以使基频光全部经过倍频晶体发送倍频， 并使 倍频光及时透射出去， 减少基频光与倍频光的损耗；
第一腔镜 104与输入耦合镜 102之间的空间为镜腔 1 , 第一腔镜 104与输出 耦合镜 106之间的空间为镜腔 2, 镜腔 1和镜腔 2的长度分别为 L1和 L2, 根据公 式（1)来调整 L1和 L2, 以调节振荡的基频光的频率间隔， 公式（1)如下所示： v= *c/ (2nL) m=l, 2, 3...... (1)
其中， v为驻波场的基频光的频率， c为真空中的光速， n是镜腔内气体的 折射率， L为镜腔的长度， 不满足公式（1)的其它频率的基频光将逐渐在镜腔 1 和镜腔 2中被消耗掉。
在实际应用中， 激光晶体对基频光的增益强度和基频光的频率之间的关 系可以由公式（2)计算得到， 公式（2)如下所示：
Figure imgf000010_0001
为频率是 v的基频光的增益强度， Δν为增益带宽， V。为增益的基频 光的中心频率，每种激光晶体都有其特有的增益中心频率， 增益频率是增益曲 线的中间值， 也是增益强度最大的基频光的频率；
基频光的波长为 1064讓， 在第一腔镜 104的两个侧面镀一层对基频光 1064 腿的波长部分透射（Part Transmission, PT)以及对波长为 532讓的倍频光高 反射的光学介质， 第一腔镜 104对基频光 1064讓的波长部分透射的透射率可以 根据实际情况设置， 以满足形成基频光的驻波场的条件为准， 例如可以将透 过率设置在 5-50%之间， 以在镜腔 1和镜腔 2里分别形成包括多种频率的基频光 的驻波场 1和驻波场 2;
一个实施例中， 输入耦合镜 101和输出耦合镜 106釆用平面镜， 第一腔镜 1 04釆用凸透镜， 焦距为 25mm, 本实施例中， 第一腔镜 104不仅能对基频光进行 部分透射， 而且还能改变被激光晶体振荡增益的基频光的光束直径； 在实际 应用中， 第一腔镜 1 04还可以通过釆用凸透镜或凹透镜来改变基频光的光束直 径等参数， 第一腔镜还可以是加部分透光膜或镀层的平面镜、 凹面镜、 凸面 镜以及各种非球面镜， 只要上述型号的第一腔镜具备对基频光部分透射的功 能， 能实现至少两个驻波场即可。
一个实施例中， 设定 L1为 64. 5mm, 将 L2设定为 29mm, 图 2为本发明实施例 中驻波场 1中基频光的相对光强图， 图 3为本发明实施例中驻波场 2中基频光的 相对光强图， 驻波场 1和驻波场 2的基频光的相对光强分别如图 2和图 3所示， 镜腔的长度与驻波场中基频光的波长之间的关系可以通过现有技术计算得 到， 在此不再赘述。 图 4为本发明实施例中基频光与其增益强度的关系图， 驻 波场 1和驻波场 2中相同波长的基频光将按照如图 4所示的增益强度在激光晶 体 1 02中得到增益， 基频光的增益强度曲线为洛伦兹曲线， 图 5为本发明实施 例中增益后的基频光的相对光强图。 如图 5所示， 驻波场 1和驻波场 2中波长相 同的基频光被激光晶体 1 02增益， 增益后的基频光的相对光强为该波长在驻波 场 1的相对光强、 驻波场 2中的相对光强和增益强度三者的乘积， 由于整个谐 振腔内的基频光的频率间隔增大， 使驻波场 1和驻波场 2中的波长相等的基频 光数量已经很少， 而且， 由于激光晶体对不同波长的基频光的增益强度符合 洛伦兹曲线， 所以， 通常只有增益中心的基频光才能被高增益， 其它波长的 基频光将被消耗掉， 从而选择出单纵模的基频光， 在图 5中， 只有波长为 1 064 讓的基频光被高增益， 该单纵模的基频光经过倍频晶体 1 05的倍频， 由于只有 单纵模的基频光被倍频， 因此， 避免了绿光问题， 可以得到功率稳定的倍频 光， 该倍频光的波长为 5 32nm。
一个实施例中， 可以在第一腔镜 1 04与激光晶体 1 03之间还可以再设置一 块光学透镜 1 07 , 图 6为本发明另一个实施例中激光处理装置的结构示意图， 如图 6所示， 本实施中， 倍频晶体 1 05釆用 1 5匪的 LB0倍频晶体， 激光晶体 1 03 釆用 5匪掺杂 1 %的 Nd离子的 GdV04晶体， 输入耦合镜 1 02对 91 2nm的基频光高反 射， 光学透镜 1 07对 91 2讓的基频光高透射， 其作用是利用凸透镜的性质来改 变光线传播方向的性质来改变基频光的光束直径， 第一腔镜 104与输入耦合镜 102之间的空间为镜腔 3 , 第一腔镜 104与输出耦合镜 106之间的空间为镜腔 4 , 设定 L3为 148. 5mm、 L4为 69. lmm, 在镜腔 3和镜腔 4中形成驻波场 3和驻波场 4 , 图 7为本发明另一个实施例中驻波场 3中基频光的相对光强图， 图 8为本发明另 一个实施例中驻波场 4中基频光的相对光强图， 如图 7和图 8所示， 不满足公式 (1)的其它波长的基频光将被消耗掉， 从而减少了基频光的纵模数， 图 9为本 发明另一个实施例中基频光的增益强度曲线图， 驻波场 3和驻波场 4中波长相 等的基频光将按照如图 9所示的增益强度曲线被激光晶体 1 03振荡增益放大， 如图 9所示， 由于釆用了 1064讓的高损耗设计， 激光晶体 103对波长为 912讓的 基频光的增益强度最高， 图 1 0为本发明另一个实施例中增益后的基频光的相 对光强图， 如图 10所示， 波长为 912nm的基频光的增益强度最大， 该单纵模的 波长为 912讓的基频光经过倍频晶体 105的倍频， 从而获得波长为 456nm的激光 光束， 本实施例中， 由于只有波长为 912nm的单纵模基频光被倍频， 避免了绿 光问题， 从而可以得到功率稳定的倍频光；
一个实施例中， 可以将上述光学透镜 107替换成第二腔镜 104 , 图 1 1为本 发明再一个实施例中激光处理装置的结构示意图。 如图 1 1所示， 波长转换单 元包括第一腔镜 1 04和第二腔镜 1 G4 , 第二腔镜 1 G4对基频光如同第一腔镜 1 04 对基频光进行部分透射，对倍频光和泵浦光高反射， 由于第一腔镜 104对基频 光部分透射和部分反射， 因此， 可以在第二腔镜 104和第一腔镜 104形成的镜 腔 7形成驻波场 7 , 镜腔 7的长度为 L7 , L7=44. 55mm, 驻波场 7中形成驻波的基 频光满足公式（1) , 第二腔镜 104与输入耦合镜之间形成镜腔 5 , 长度为 L5 , L 5=93. 95mm, 镜腔 5中存在满足公式（1)的基频光形成的驻波场 5 , 第一腔镜 104 与输出耦合镜 106之间形成镜腔 6 , 长度为 L6 , L6仍为 69. lmm镜腔 6中存在满足 公式（1)的基频光形成的驻波场 6 , 驻波场 5、 驻波场 6和驻波场 7中相同频率的 基频光将被激光晶体按照如图 9所示的增益强度曲线进行增益， 从而得到如图 10所示的只有一个纵模的基频光， 本实施例中， 第二腔镜 104和第一腔镜 104 对基频光的部分反射率以在镜腔 5、 镜腔 6和镜腔 7中形成稳定的驻波场为准， 驻波场 5和驻波场 7中基频光的相对光强图与驻波场 3中的基频光的相对光强 图相同， 驻波场 6中的基频光的相对光强图与驻波场 4中基频光的相对光强图 相同， 在此不再赘述。
一个实施例中， 如图 12所示， 在倍频晶体 1 05与输出耦合镜 1 06之间设置 一块与倍频晶体 1 05配合使用和频晶体 1 05 , 以生成三倍频光， 图 12为本发明 又一个实施例中激光处理装置的结构示意图， 如图 12所示， 波长转换单元包 括倍频晶体 1 05和匹配和频晶体 1 05 倍频晶体 1 05和匹配和频晶体 1 05 分别 釆用 I类和 II类相位匹配的 10匪的 LB0晶体， 激光晶体釆用 12mm掺杂 0. 6%的 N d离子的 YV04晶体， 其中第一腔镜 1 04镀一层对 532讓和 355讓高反射以及对 106 4讓的基频光部分透射的光学介质， 输入耦合镜 102和第一腔镜 104之间的空间 为镜腔 8 , 镜腔 8的长度 L8为 75匪， 输出耦合镜 1 06和第一腔镜 104之间的空间 为镜腔 9 , 镜腔 9的长度 L9为 39mm, 在镜腔 8和镜腔 9中分别形成驻波场 8和驻波 场 9 , 图 1 3为本发明又一个实施例中驻波场 8中基频光的相对光强图， 图 14为 本发明又一个实施例中驻波场 9中基频光的相对光强图， 其中， 驻波场 8如图 1 3所示， 驻波场 9如图 14所示， 图 15为本发明又一个实施例中基频光的增益强 度曲线， 驻波场 8和驻波场 9中相同波长的基频光按照如图 15所示的增益强度 曲线被激光晶体 1 03增益， 增益后的基频光的相对光强为该波长在驻波场 8的 相对光强、 驻波场 9中的相对光强和增益强度三者的乘积， 从而在整个谐振腔 内得到如图 16所示的单纵模的基频光， 图 16为本发明又一个实施例中增益后 的基频光的相对光强图， 该单纵模的基频光经过倍频晶体 105与和频晶体 105 ' 后被三倍频激发， 得到波长为 355nm的三倍频激光， 改变倍频晶体的种类或数 量， 还可以得到多倍频光， 包括四倍频光、 五倍频光以及以上倍数的多倍频 光。
一个实施例中， 将激光晶体 103与输入耦合镜 102—体制作， 将倍频晶体 1 05与输出耦合镜 1 06—体制作， 图 17为本发明又一个实施例中激光处理装置的 结构示意图， 如图 17所示， 其中， 第一腔镜 104对基频光部分透射， 输入耦合 镜 1 02和输出耦合镜 1 06基频光高反射， 以在第一腔镜 1 04与输入耦合镜 102之 间的镜腔 1 0形成基频光的驻波场， 以及在第一腔镜 1 04与输出耦合镜 1 06之间 的镜腔 1 1形成基频光的驻波场， 为了减少激光处理装置对泵浦光和倍频光或 多倍频光的损耗， 通常在输入耦合镜 1 02镀一层对基频光高反射的光学介质， 在输出耦合镜 106镀一层对倍频光或多倍频光高透射的光学介质， 以使倍频后 的激光束高效率的发射出去；
进一步的， 可以直接在激光晶体 1 03与泵浦装置 1 01相邻的侧面镀一层对 基频光高反射并对泵浦光高透射的光学介质， 在倍频晶体 1 05的输出的侧面镀 一层对基频光高反射并对倍频光或多倍频光高透射的光学介质， 从而减少基 频光的损耗与激光处理装置的生产成本。
进一步的， 波长转换单元还可以为 1个或 2个及以上的和频晶体的组合， 或为 1个及以上的倍频晶体的组合， 或 1个及以上的和频晶体与 1个及以上的倍 频晶体的组合， 根据所需要的倍频光的频率和功率来选择组合。
上述各实施例中， 第一腔镜的部分透射可以通过现有技术中的光学介质 的镀膜技术来实现， 在此不再赘述； 可以根据实际需要生成的倍频光来选择 相应的波长转换单元， 除上述的磷酸氧钛钾 KTP晶体和三硼酸锂 LB0晶体之外 , 波长转换单元还可以选择偏硼酸钡 BB0晶体、 硼酸铋 B I B0晶体、 碑酸氧钛 4如 RT P晶体、 砷酸钛氧钾 KTA晶体、 磷酸二氢钾 KDP晶体、 周期性极化铌酸锂 PPLN晶 体和周期极化磷酸氧钛钾 PPKTP晶体等周期极化晶体， 通过设置不同的晶体类 型和数量来获取相应的倍频光或多倍频光。
综合上述实施例可知， 在本发明的实施例中， 通过在第一腔镜上镀一层 对基频光部分透射的光学介质， 使基频光在第一腔镜两侧的镜腔内上分别形 成包括多种波长的基频光的驻波场， 按照设计目标对激光处理装置各腔镜长 度与镜片曲率确定后， 根据公式（1)细微调整各镜腔的长度以得到包括所需要 波长的驻波场， 各个驻波场中波长均相等的基频光将被激光晶体按照增益强 度曲线振荡增益， 通常可以在整个谐振腔内得到单频的基频光， 该单频的基 频光经过倍频晶体倍频之后得到功率稳定的倍频光， 本发明实施例提高了倍 频光或多倍频光的功率稳定性， 而且并不需要对现有的激光处理装置做太多 的改动。
图 18为本发明实施例激光显示光源的结构示意图， 如图 18所示， 本发明 实施例中的激光显示光源包括泵浦光发射器 1 01和激光处理装置， 泵浦光发 射器用于输出泵浦光， 激光处理装置采用如图 1所示的结构， 激光处理装 置还可以采用上述实施例中其它的结构， 在此不再赘述。
进一步的， 本发明实施例中的激光显示光源可以应用于激光显示电视 等激光显示终端中， 激光显示电视包括泵浦光发射器、 激光处理装置和显示 屏，激光显示电视中的泵浦光发射器输出泵浦光，激光处理装置中腔室的输 入耦合透镜 1 02接收泵浦光， 泵浦光被激光晶体 1 03吸收后发生自发辐射与受 激辐射， 输出基频光， 该基频光经过输入耦合镜 1 02和输出耦合镜 1 06之间的 反射而被激光晶体 103反复振荡增益， 逐渐增益为基频光的光束， 第一腔镜 10 4与输入耦合镜 102之间的空间为镜腔 1 , 第一腔镜 1 04与输出耦合镜 106之间的 空间为镜腔 2 , 第一腔镜 1 04对基频光部分透射的透射率可以根据实际情况设 置， 以满足形成基频光的驻波场的条件为准， 以在镜腔 1和镜腔 2里分别形成 包括多种频率的基频光的驻波场 1和驻波场 2 , 如图 5所示， 驻波场 1和驻波场 2 中波长相同的基频光被激光晶体 102增益， 增益后的基频光的相对光强为该波 长在驻波场 1的相对光强、 驻波场 2中的相对光强和增益强度三者的乘积， 由 于整个谐振腔内的基频光的频率间隔增大， 使驻波场 1和驻波场 2中的波长相 等的基频光数量已经很少， 而且， 由于激光晶体对不同波长的基频光的增益 强度符合洛伦兹曲线， 所以， 通常只有增益中心的基频光才能被高增益， 其 它波长的基频光将被消耗掉， 从而选择出单纵模的基频光， 在图 5中， 只有波 长为 1064腿的基频光被高增益， 该单纵模的基频光经过倍频晶体 105的倍频， 由于只有单纵模的基频光被倍频， 因此， 避免了绿光问题， 可以得到功率稳 定的倍频光， 该倍频光的波长为 532nm, 该功率稳定的倍频激光用于在显示屏 上显示亮度、 清晰度稳定的视频图像， 提高了激光显示电视等激光显示终端 的视频图像的显示效果。
图 19为本发明实施例激光处理方法的流程图。 如图 19所示， 激光处理方 法的流程可以包括如下步骤：
步骤 1901、 部分透射基频光。
在本发明实施例中， 可以采用上述任意一种激光处理装置来实现该方 法， 在此以如图 1所示的激光处理装置为例来介绍本发明实施例的技术方案， 腔室中的第一腔镜 1 04对腔室的接收端接收的泵浦光进行部分透射和部分反 射， 然后进入步骤 1902。
步骤 1902、 将部分透射后的基频光波长转换输出激光。
第一腔镜 1 04对腔室的接收端接收的泵浦光进行部分透射和部分反射后， 泵浦光将在镜腔 1和镜腔 2里分别形成包括多种频率的基频光的驻波场 1和驻 波场 2 , 驻波场 1和驻波场 2中相同波长的基频光将按照如图 4所示的增益强度 在激光晶体 102中得到增益， 基频光的增益强度曲线为洛伦兹曲线， 由于激光 晶体对不同波长的基频光的增益强度符合洛伦兹曲线， 所以， 通常只有增益 中心的基频光才能被高增益， 其它波长的基频光将被消耗掉， 从而选择出单 纵模的基频光， 在图 5中， 只有单纵模的基频光经过作为波长转换单元的倍频 晶体 105的倍频， 由于只有单纵模的基频光被倍频， 因此， 避免了绿光问题， 可以得到功率稳定的激光。
一个实施例中， 所述部分透射基频光通过加膜或镀层的凸透镜、 凹透镜、 平面镜、 柱透镜或非球面镜作为第一腔镜对基频光部分透射。
进一步的， 设置为 1个或 2个及以上的和频晶体的组合， 或为 1个及以上的 倍频晶体的组合， 或 1个及以上的和频晶体与 1个及以上的倍频晶体的组合， 根据所需要的倍频光的频率和功率来选择组合。 以上所述的具体实施方式， 对本发明的目的、 技术方案和有益效果进行 了进一步详细说明， 所应理解的是， 以上所述的实施例仅为本发明的具体实 施方式而已， 并不用于限定本发明的保护范围， 凡在本发明的精神和原则之 内， 所做的任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之 内。

Claims

权 利 要 求 书
1、 一种激光处理装置， 其特征在于， 包括：
腔室， 所述腔室的输入端接收泵浦光； 所述腔室内设置激光晶体、 波长 转换单元， 所述激光晶体将泵浦光激发后生成基频光， 所述波长转换单元将 所述基频光进行波长转换后输出激光；
所述激光晶体和波长转换单元之间设置第一腔镜， 所述第一腔镜用于部 分透射基频光；
所述腔室的输入端对所述泵浦光高透射， 对所述基频光高反射， 和 /或对 所述激光高反射；
所述腔室的输出端对所述基频光高反射和 /或对所述激光高透射。
2、 根据权利要求 1所述的激光处理装置， 其特征在于， 所述第一腔镜包 括： 加部分透光膜或镀层的凸透镜、 IHJ透镜、 平面镜、 柱透镜或非球面镜。
3、 根据权利要求 1或 2所述的激光处理装置， 其特征在于， 所述波长转换 单元是 1个或 2个及以上的和频晶体、 1个及以上的倍频晶体、 或 1个及以上的 和频晶体与 1个及以上的倍频晶体的组合。
4、 根据权利要求 3所述的激光处理装置， 其特征在于：
所述波长转换单元包括：
磷酸氧钛钾 KTP晶体， 三硼酸锂 LB0晶体、 偏硼酸钡 BB0晶体、 硼酸铋 BIB0 晶体、 磷酸氧钛 4如 RTP晶体、 砷酸钛氧钾 KTA晶体、 磷酸二氢钾 KDP晶体、 周期 性极化铌酸锂 PPLN晶体和 /或周期极化磷酸氧钛钾 PPKTP晶体。
5、 根据权利要求 1所述的激光处理装置， 其特征在于： 所述的激光处理 装置还包括：
光学透镜， 设置在所述第一腔镜和所述激光晶体之间， 和 /或设置在所述 第一腔镜和所述波长转换单元之间， 用于增大或减小所述激光的光束直径。
6、 根据权利要求 1所述的激光处理装置， 其特征在于： 还包括： 第二腔镜， 部分透射基频光， 所述第二腔镜至少为一片， 设置在所述第 一腔镜与所述激光晶体之间。
7、 一种激光显示光源， 包括输出泵浦光的泵浦光发射器， 还包括如权利 要求 1至 6任一所述的激光处理装置。
8、 一种激光处理方法， 包括： 接收泵浦光； 激发泵浦光生成基频光； 其特征在于， 所述方法还包括：
部分透射基频光；
将部分透射后的基频光波长转换输出激光；
所述泵浦光的接收端对所述泵浦光高透射， 对所述基频光高反射， 和 /或 对所述激光高反射；
所述激光的输出端对所述基频光高反射和 /或对所述激光高透射。
9、 根据权利要求 8所述的激光处理方法， 其特征在于， 所述部分透射基 频光通过加膜或镀层的凸透镜、 IHJ透镜、 平面镜、 柱透镜或非球面镜对所述 基频光部分透射。
1 0、 根据权利要求 8或 9所述的激光处理方法， 其特征在于， 所述将过滤 后的基频光波长转换输出激光包括：
设置 1个或 2个及以上的和频晶体、 一个及以上的倍频晶体、 或一个及以 上的和频晶体与一个及以上的倍频晶体的组合对所述基频光进行波长转换。
PCT/CN2010/071842 2010-04-16 2010-04-16 一种激光产生装置和方法 WO2011127664A1 (zh)

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