CN102136670A - Double-end end-pumped solid laser based on polarization coupling - Google Patents
Double-end end-pumped solid laser based on polarization coupling Download PDFInfo
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Abstract
The invention provides a double-end end-pumped solid laser based on polarization coupling, comprising a pumping source (1), a collimating lens (2), a polarization splitting prism (3), a one-half wave plate (4), a reflector (5), a focusing lens, a laser gain medium (7) and a laser resonant cavity. The pumping source (1) is a filter coupling output laser diode and outputs non-polarized laser; and the laser gain medium (7) is an anisotropic uniaxial crystal. The non-polarized laser output by the fiber coupling output laser diode is decomposed into two beams of polarized laser through a polarized beam splitter prism, respectively coupled into the gain medium from both end surfaces of the gain medium through an optical system so that the polarization direction of the pumping laser entering the gain medium is parallel to a certain optical axis in the laser gain medium, and double-end polarized laser end-pumping is realized. The invention can overcome the problems of thermal load distribution unevenness, and the like caused by non-polarized one-end end-pumping so as to improve the output power, the beam quality and the operation stability of the laser.
Description
Technical field
The present invention relates to all solid state laser, specifically is a kind of both-end end-face pump solid laser based on polarization coupled.
Background technology
With the laser is the laser technology of core, and more and more important effect is played in the progress and development of advanced manufacturing industry and related industry, science and technology, medical skill and science and techniques of defence.Along with the raising of laser diode production and encapsulation technology, laser diode-pumped solid state laser obtains fast development.It is all solid state that such device not only makes solid state laser really realize, and have advantages such as high efficiency, long-life, compact conformation, frequency stabilization.Laser diode-pumped solid state laser can end-pumped laser and side-pumped laser by the pumping coupled modes.The advantage of side-pumped laser is that the axial pump light along gain media evenly distributes, therefore gain media axially on heat load evenly distribute, poor but its shortcoming is the pattern coverage of pumping laser and oscillating laser, the laser threshold height, efficient is low.Compare with side-pumped laser, end-pumped laser can be by carrying out the shaping and the focusing of laserresonator design and pumping, make implementation pattern coupling between pump light and the oscillating laser, laser can directly be realized the running of single transverse mode, and such laser has that the laser pumping threshold power is low, conversion efficiency is high and advantage such as compact conformation.Along with the technical development in fields such as industry and science and technology, to the more and more higher demand of beam quality proposition of laser output laser.When improving laser output power, how to improve the beam quality of output laser and laser-conversion efficiency and be everybody question of common concern in the laser development process.
In laser diode end-face pump solid laser, though can be by making the directly single transverse mode running of realization of implementation pattern coupling between pump light and the oscillating laser, improving conversion efficiency, but, can cause gain medium to have serious thermal effect because pump energy is concentrated.When the axial propagation of pump light along gain media, in the pumping end surface of gain media, the pumping light intensity is the highest, and the thermal effect of gain media is the most serious; Along with the absorption of gain media to pump light, in the non-pumping end surface of gain media, the thermal effect of gain media relatively a little less than.Therefore, in the laser diode end-face pump solid laser structure, cause heat load evenly not distribute, and pump light also can cause serious effect of end surface in that the pumping end surface intensity of gain media is the highest along the axial pump light skewness of gain media.In the process of development superpower laser, need increase pump power for improving output power of laser, the heat distortion meeting of the gain media that above-mentioned situation causes is more serious, thereby influences the beam quality of laser output laser.On the other hand, in laser diode pump solid state laser device, be to improve the light light conversion efficiency of laser, the centre wavelength of the absworption peak of the centre wavelength of pumping laser and gain media is complementary.For anisotropic gain medium, the normal conditions gain media is parallel to the polarization direction and is inconsistent perpendicular to the pump light absorption coefficient of a certain optical axis (as the c axle), as Nd:YVO
4Gain media, at the absworption peak place of centre wavelength 808nm and 880nm, the pump light absorption coefficient that the polarization direction is parallel to the c axle is more than 4 times of vertical c axle; Even gain media is parallel to the polarization direction and inconsistent perpendicular to the absorbent core wavelength of the pump light of c axle, as the Nd:YLF gain media, the absorbent core wavelength that the polarization direction is parallel to the pump light of c axle is 792nm, and the polarization direction is 797nm perpendicular to the absorbent core wavelength of the pump light of c axle.Therefore, in the solid state laser of laser diode-pumped anisotropy gain medium, for improving the light light conversion efficiency of laser, not only need to make the centre wavelength of the absworption peak of the centre wavelength of pumping laser and gain media to be complementary, also need to make the optical axis of the polarization direction of pumping laser and pairing gain media consistent.
Along with the progress of laser diode design and production technology, up to now, the peak power output of optical fiber coupling output laser diode has reached 500W.At present, in the development of high-power laser diode end-face pump solid laser, generally adopt the pumping source of optical fiber coupling output laser diode, to improve the beam quality and the light light conversion efficiency of output laser as laser.But the output laser of optical fiber coupling output laser diode is non-polarized light, cause the anisotropy gain medium by the coupling of collimation Focused Optical system end face after, can have following problem and cause reducing the beam quality and the conversion efficiency of laser output laser.First, the anisotropy gain medium is parallel to the polarization direction and is inconsistent perpendicular to the pump light absorption coefficient of a certain optical axis, generally differ several times as mentioned above, pump light is absorbed very soon along being parallel to a certain optical axis direction, and need long relatively absorption length along vertical a certain optical axis direction, therefore gain medium is parallel to and perpendicular to the heat load of a certain optical axis direction, temperature gradient is inconsistent, the effect of end surface that causes gain media, thermal lensing effect is inconsistent on both direction, and then influences the run stability of laser, the polarization direction and the light distribution of output laser; Cause the distortion of gain media generation heat, and then reduce the beam quality of output laser, the danger that the increase gain media breaks.Second, the output laser of optical fiber coupling output laser diode is non-polarized light, its polarization state can change with the variation of the pressure and temp on the placement orientation of coupled fiber, dish garden diameter, distortion angle, the optical fiber etc., cause the anisotropy gain medium to polarization parallel in changing with absorbing also perpendicular to the pump light of a certain optical axis, thereby influence the operating condition of laser.The 3rd, axial pump light skewness along gain media causes heat load evenly not distribute, especially increase pump power for improving laser output power, heat load distribution effect of end surface inhomogeneous and pumping end surface is more serious in the gain media, can influence the power and the beam quality of laser output laser.
Summary of the invention
The purpose of this invention is to provide a kind of both-end end-face pump solid laser, solve problems such as heat load distribution that unpolarized single-ended end pumping causes is inhomogeneous, improve power output, beam quality and the run stability of laser based on polarization coupled.
Both-end end-face pump solid laser based on polarization coupled provided by the invention comprises as pumping source 1, collimating lens 2, polarization splitting prism 3,1/2nd wave plates 4, speculum 5, first condenser lens 61, second condenser lens 62, gain medium 7 and laserresonator; Described pumping source 1 is the laser diode of optical fiber coupling output, and the laser of its output is non-polarized light; Described gain medium 7 is anisotropic uniaxial crystal, and it is parallel to for the polarization direction and is inconsistent even the absorbent core wavelength is inconsistent perpendicular to the pump light absorption coefficient of a certain optical axis (as the c axle); According to above-mentioned design, behind non-polarized Raman laser scioptics 2 collimations of pumping source 1 output, be decomposed into the orthogonal two bundle pumping lasers in polarization direction through polarization splitting prism 3, the polarization direction a branch of pumping laser parallel with a certain optical axis of gain medium (as the c axle) be through first condenser lens 61, is coupled into gain medium from an end face of gain medium 7; Polarization direction vertical with it another bundle pumping laser revolves the polarization direction through 1/2nd wave plates 4 and turn 90 degrees, again through 5 reflections of at least two speculums, then through second condenser lens 62, be coupled into gain medium from another end face of gain medium 7.
Described laserresonator is made of the first input coupling mirror 81, the second input coupling mirror 82, chamber mirror 9 and output coupling mirror 10.The first input coupling mirror 81, the second input coupling mirror 82, chamber mirror 9 and output coupling mirror 10 can be plane mirror, convex reflecting mirror or concave mirror, the chamber mirror can not have or its number is 1 or a plurality of (expression with 91 time, when a plurality of with 91,92,93...... etc. represents), concrete condition determines according to concrete laser design.Structure and chamber by the design laserresonator are long, make oscillating laser and pumping laser implementation pattern coupling at gain medium, make laser directly realize single transverse mode running.The structure of laserresonator can be linear standing wave resonance chamber, to obtain single transverse mode lasers output; The structure of laserresonator can be a ring resonator also, and places the optical-unidirectional device that is made of 1/2nd wave plates 11, Faraday rotator 12 in resonant cavity, makes the running of laser unidirectional traveling wave, to obtain single-frequency laser output.
Described both-end end-face pump solid laser based on polarization coupled can comprise frequency-doubling crystal 13.Described frequency-doubling crystal is KTP, LBO, BBO, LiNbO
3Or PPKTP etc.Insert the wavelength that frequency-doubling crystal can change laser in the chamber, effectively widen the wave-length coverage of laser.Under the concrete condition, can choose suitable crystal as frequency-doubling crystal according to the parameters such as wavelength, phase matched mode and power output of laser.
Described both-end end-face pump solid laser based on polarization coupled can comprise element and the frequency tuning element 14 of choosing single longitudinal mode, makes laser realize single-frequency operation and realization frequency tuning.The described element of choosing single longitudinal mode is etalon, optical-unidirectional device, birefringent filter or quarter-wave plate etc.Described frequency tuning element 14 is electrooptic crystal, birefringent filter or piezoelectric ceramic etc.
Described both-end end-face pump solid laser based on polarization coupled can comprise Q switched element 15.Described Q switched element 15 is mechanical Q-switch, electro-optical Q-switch, acoustooptic Q-switching or passive Q-switch etc.
The both-end end-face pump solid laser based on polarization coupled of the present invention's design is compared with the similar laser of having reported and is had the following advantages and effect:
1, among the present invention, the non-polarized Raman laser of optical fiber coupling output laser diode output is decomposed into the orthogonal two bundle pumping lasers in polarization direction through polarization splitting prism, again through 1/2nd wave plates will be wherein the polarization direction of beam of laser revolve and turn 90 degrees, make the polarization direction of the pumping laser that enters gain media parallel with a certain optical axis in the gain medium, realize the polarised light pumping, overcome and be parallel in the gain medium that unpolarized pumping causes and perpendicular to the heat load of a certain optical axis direction, inconsistent and a series of problems that cause of temperature gradient overcome the orientation of optical fiber coupling output laser diode output coupled fiber simultaneously, distortion, pressure etc. are to the influence of laser operation state.
2, among the present invention, the non-polarized Raman laser of optical fiber coupling output laser diode output is decomposed into two bundle polarization lasers through polarization beam splitter prism, be coupled into gain media by optical system respectively from two end faces of gain media, forming uniform pump light in gain media distributes, overcome problems such as the effect of end surface of the axial heat load uneven distribution along gain media that the coupling of single-ended end pumping occurs, pumping end surface is more serious, thereby the power output, beam quality and the running that improve laser are stable.
In a word, the both-end end-face pump solid laser based on polarization coupled of the present invention's design, can realize good beam quality, the superpower laser that light-light conversion efficiency is high, wide application prospect be arranged in fields such as scientific research, national defense construction, biologic medical, information industries.
Description of drawings
Fig. 1 is an embodiment of the present invention one: based on the both-end end pumping four mirror annular chamber single frequency laser light path schematic diagrames of polarization coupled
Fig. 2 is an embodiment of the present invention two: based on the folding standing-wave cavity laser light path schematic diagram of both-end end pumping three mirrors of polarization coupled
Fig. 3 is an embodiment of the present invention three: based on the both-end end pumping six mirror annular chamber inner cavity frequency-doubling single frequency laser light path schematic diagrames of polarization coupled
Embodiment
Below in conjunction with accompanying drawing the present invention is made and to further specify.
Execution mode one: a kind of both-end end pumping four mirror annular chamber single frequency lasers based on polarization coupled shown in Figure 1 comprise optical fiber coupling output laser diode 1, collimating lens 2, polarization splitting prism 3,1/2nd wave plates 4, speculum 5, first condenser lens 61, second condenser lens 62, gain medium 7 and laserresonator as pumping source.Pumping source 1 is an optical fiber coupling output laser diode, and the laser of being exported by optical fiber is non-polarized light, power output 60W, and the centre wavelength of output laser is 880nm; Gain medium 7 is the Nd:YVO of 0.3at% for the cutting of a axle, doping content
4Laser crystal, Nd:YVO
4Two logical light faces of crystal plate 1.064 μ m and the two antireflective films of 880nm, and this crystal is parallel to the pump light of c axle to the polarization direction absorption coefficient is 4cm
-1, be 1cm to the polarization direction perpendicular to the absorption coefficient of the pump light of c axle
-1Behind non-polarized Raman laser scioptics 2 collimations of optical fiber coupling output laser diode 1 output, be decomposed into the orthogonal two bundle pumping lasers in polarization direction through polarization splitting prism 3; Polarization direction and Nd:YVO
4A branch of pumping laser line focus lens 61 that the crystal c axle is parallel are from Nd:YVO
4The left side of crystal is coupled into Nd:YVO
4Crystal; Polarization direction vertical with it another bundle pumping laser revolves the polarization direction through 1/2nd wave plates 4 earlier and turn 90 degrees, again through 5 reflections of three speculums, then through second condenser lens 62, from Nd:YVO
4The right side of crystal is coupled into Nd:YVO
4Crystal.Two logical light faces of collimating lens, condenser lens all plate the 880nm antireflective film, speculum 5 plating 880nm high-reflecting films.Laserresonator is the ring resonator that is made of the first input coupling mirror 81, the second input coupling mirror 82, chamber mirror 9 and output coupling mirror 10.The first input coupling mirror 81, the second input coupling mirror 82 are plane mirrors, and it is towards Nd:YVO
4The surface plating of crystal is to high saturating, the 1.064 μ m fundamental frequency light high-reflecting films of 880nm pump light, and plate the 880nm antireflective film on its another surface; Chamber mirror 9 is plano-concave mirrors, and its concave surface plating is to 1.064 μ m fundamental frequency light high-reflecting films; Output coupling mirror 10 is plano-concave mirrors, and the plating of its concave surface is 80% partial reflection film to 1.064 μ m fundamental frequency light reflectivities, and plate 1.064 μ m fundamental frequency light antireflective films on the plane.Structure and chamber by the design laserresonator are long, make at Nd:YVO
4Oscillating laser in the crystal and pumping laser implementation pattern coupling, laser directly realize single transverse mode running.In resonant cavity, place by 1/2nd wave plates 11, Faraday rotator 12 formation optical-unidirectional devices, make the running of laser unidirectional traveling wave, obtain continuous single-frequency 1.064 μ m laser output.This laser of above-mentioned design and development can reach following technical indicator: single-frequency 1.064 μ m laser output powers are 18W continuously, and light-phototranstormation efficiency is 35%, beam quality M
2Less than 1.05, laser can running steady in a long-term more than 4 hours, power stability is less than ± 0.5%.
Execution mode two: the folding standing-wave cavity single-transverse mode laser of a kind of both-end end pumping three mirrors based on polarization coupled shown in Figure 2 comprises optical fiber coupling output laser diode 1, collimating lens 2, polarization splitting prism 3,1/2nd wave plates 4, speculum 5, first condenser lens 61, second condenser lens 62, gain medium 7 and laserresonator as pumping source.Pumping source 1 is an optical fiber coupling output laser diode, and the laser of being exported by optical fiber is non-polarized light, and the centre wavelength of output laser is 797nm; Gain medium 7 is the Nd:YLF laser crystal of 0.5at% for a axle cutting, doping content, and the absorbent core wavelength that the polarization direction is parallel to the pump light of c axle is 792nm, and the polarization direction is 797nm perpendicular to the absorbent core wavelength of the pump light of c axle; Two logical light faces of Nd:YLF crystal plate 1.053 μ m and the two antireflective films of 797nm.Behind non-polarized Raman laser scioptics 2 collimations of optical fiber coupling output laser diode 1 output, be decomposed into the orthogonal two bundle pumping lasers in polarization direction through polarization splitting prism 3; A branch of pumping laser line focus lens 61 that the polarization direction is vertical with Nd:YLF crystal c axle are coupled into the Nd:YLF crystal from Nd:YLF crystal right side; Polarization direction parallel with it another bundle pumping laser revolves the polarization direction through 1/2nd wave plates 4 earlier and turn 90 degrees, and again through 5 reflections of three speculums, then through second condenser lens 62, is coupled into the Nd:YLF crystal from the left side of Nd:YLF crystal.Two logical light faces of collimating lens and condenser lens all plate the 797nm antireflective film, speculum 5 plating 797nm high-reflecting films.Laserresonator is the folding standing wave resonance chamber of three mirrors that is made of the first input coupling mirror 81, the second input coupling mirror 82 and output coupling mirror 10.It is convex reflecting mirrors that the first input coupling mirror 81, second is imported coupling mirror 82, its convex surface plating, 1.053 μ m fundamental frequency light high-reflecting films high thoroughly to the 797nm pump light towards the Nd:YLF crystal, and the 797nm antireflective film is plated on its another surface; Output coupling mirror 10 is level crossings, and the plating of one plane is 90% partial reflection film to 1.053 μ m fundamental frequency light reflectivities, and another plane plating is to 1.053 μ m fundamental frequency light antireflective films.Structure and chamber by the design laserresonator are long, make oscillating laser and pumping laser implementation pattern coupling in the Nd:YLF crystal, and laser is directly realized single transverse mode running, obtains continuous single transverse mode 1.053 μ m laser output.By in resonant cavity, placing Q switched element 15, can realize high-repetition-rate, Average Power Pulse 1.053 μ m laser operations.
Execution mode three: a kind of both-end end pumping six mirror annular chamber one-frequency or frequency-multiplying laser devices based on polarization coupled shown in Figure 3 comprise optical fiber coupling output laser diode 1, collimating lens 2, polarization splitting prism 3,1/2nd wave plates 4, speculum 5, first condenser lens 61, second condenser lens 62, gain medium 7 and laserresonator as pumping source.Pumping source 1 is an optical fiber coupling output laser diode, and the laser of being exported by optical fiber is non-polarized light, power output 60W, and the centre wavelength of output laser is 880nm; Gain medium 7 is the Nd:YVO of 0.3at% for the cutting of a axle, doping content
4Laser crystal, Nd:YVO
4Two logical light faces of crystal plate 1.064 μ m and the two antireflective films of 880nm, and this crystal is parallel to the pump light of c axle to the polarization direction absorption coefficient is 4cm
-1, be 1cm to the polarization direction perpendicular to the absorption coefficient of the pump light of c axle
-1Behind non-polarized Raman laser scioptics 2 collimations of optical fiber coupling output laser diode 1 output, be decomposed into the orthogonal two bundle pumping lasers in polarization direction through polarization splitting prism 3; Polarization direction and Nd:YVO
4A branch of pumping laser line focus lens 61 that the crystal c axle is parallel are from Nd:YVO
4The left side of crystal is coupled into Nd:YVO
4Crystal; Polarization direction vertical with it another bundle pumping laser revolves the polarization direction through 1/2nd wave plates 4 earlier and turn 90 degrees, again through 5 reflections of three speculums, then through second condenser lens 62, from Nd:YVO
4The right side of crystal is coupled into Nd:YVO
4Crystal.Two logical light faces of collimating lens, condenser lens all plate the 880nm antireflective film, speculum 5 plating 880nm high-reflecting films.Laserresonator is that the ring resonator first input coupling mirror 81, the second input coupling mirror 82 that are made of the first input coupling mirror 81, the second input coupling mirror 82, chamber mirror 91, chamber mirror 92, chamber mirror 93 and output coupling mirror 10 are plane mirrors, and it is towards Nd:YVO
4The surface plating of crystal is to high saturating, the 1.064 μ m fundamental frequency light high-reflecting films of 880nm pump light, and the 880nm antireflective film is plated on its another surface; Chamber mirror 91 is plano-concave mirrors, and its concave surface plating is to 1.064 μ m fundamental frequency light high-reflecting films; Chamber mirror 92 and chamber mirror 93 are level crossings, and an one plane plating is to 1.064 μ m fundamental frequency light high-reflecting films; Output coupling mirror 10 is plano-concave mirrors, and its concave surface plating is to 1.064 μ m fundamental frequency light high-reflecting films, 532nm frequency doubled light anti-reflection film, and plate 532nm frequency doubled light antireflective film on the plane.Structure and chamber by the design laserresonator are long, make at Nd:YVO
4Oscillating laser in the crystal and pumping laser implementation pattern coupling, laser directly realize single transverse mode running.In resonant cavity, place by 1/2nd wave plates 11, Faraday rotator 12 formation optical-unidirectional devices, make the running of laser unidirectional traveling wave.Place frequency-doubling crystal 13 between chamber mirror 91 and output coupling mirror 10, this crystal is selected the non-critical phase matched lbo crystal of I class for use, obtains continuous one-frequency or frequency-multiplying 532nm green laser output.By placement frequency tuned cell 14 in resonant cavity, the frequency tuning certain limit of the single-frequency laser that laser can be exported.The laser of above-mentioned design and development can reach following technical indicator: one-frequency or frequency-multiplying 532nm green laser power output is 12W continuously, light-phototranstormation efficiency is 23%, beam quality M2 is less than 1.05, and laser can running steady in a long-term more than 4 hours, power stability is less than ± 0.5%.
Core of the present invention is that the non-polarized Raman laser that optical fiber coupling output laser diode is exported is decomposed into two bundle polarization lasers through polarization beam splitter prism, be coupled into gain media by optical system respectively from two end faces of gain media, and make the polarization direction of the pumping laser that enters gain media parallel with a certain optical axis in the gain medium, realize the pumping of both-end end face polarised light.The design can overcome and is parallel in the gain medium that unpolarized pumping causes and and a series of problems that cause inconsistent perpendicular to heat load, the temperature gradient of a certain optical axis direction, and the polarised light pumping can form uniform pump light distribution in gain media, overcome problems such as the effect of end surface of the axial heat load uneven distribution along gain media that the coupling of single-ended end pumping occurs, pumping end surface is more serious, thereby the power output, beam quality and the running that improve laser are stable.
Claims (9)
1. the both-end end-face pump solid laser based on polarization coupled comprises as pumping source (1), collimating lens (2), polarization splitting prism (3), 1/2nd wave plates (4), speculum (5), first condenser lens (61), second condenser lens (62), gain medium (7) and laserresonator; Described pumping source (1) is the laser diode of optical fiber coupling output, and the laser of its output is non-polarized light; Described gain medium (7) is anisotropic uniaxial crystal; After the non-polarized Raman laser of pumping source (1) output collimates by collimating lens (2), be decomposed into the orthogonal two bundle pumping lasers in polarization direction through polarization splitting prism (3), the polarization direction a branch of pumping laser parallel with a certain optical axis of gain medium be through first condenser lens (61), is coupled into gain medium from an end face of gain medium (7); Another vertical with it bundle pumping laser of polarization direction revolves the polarization direction through 1/2nd wave plates (4) and turn 90 degrees, again through at least two speculums (5) reflections, then through second condenser lens (62), be coupled into gain medium from another end face of gain medium (7).
2. the both-end end-face pump solid laser based on polarization coupled according to claim 1 is characterized in that described laserresonator is made of the first input coupling mirror 81, the second input coupling mirror 82 and output coupling mirror 10.
3. the both-end end-face pump solid laser based on polarization coupled according to claim 1 is characterized in that described laserresonator is made of the first input coupling mirror 81, the second input coupling mirror 82, chamber mirror 9 and output coupling mirror 10.
4. the both-end end-face pump solid laser based on polarization coupled according to claim 1 is characterized in that described laserresonator is made of the first input coupling mirror 81, the second input coupling mirror 82, chamber mirror 91, chamber mirror 92, chamber mirror 93 and output coupling mirror 10.
5. according to claim 2 or 3 or 4 described both-end end-face pump solid lasers, it is characterized in that the first input coupling mirror 81, the second input coupling mirror 82, chamber mirror and output coupling mirror 10 are plane mirror, convex reflecting mirror or concave mirror based on polarization coupled.
6. according to claim 1 or 2 or 3 or 4 described both-end end-face pump solid lasers, it is characterized in that comprising frequency-doubling crystal (13) based on polarization coupled.
7. according to claim 1 or 2 or 3 or 4 described both-end end-face pump solid lasers, it is characterized in that comprising the element of choosing single longitudinal mode based on polarization coupled.
8. according to claim 1 or 2 or 3 or 4 described both-end end-face pump solid lasers, it is characterized in that comprising frequency tuning element (14) based on polarization coupled.
9. according to claim 1 or 2 or 3 or 4 described both-end end-face pump solid lasers, it is characterized in that comprising Q switched element (15) based on polarization coupled.
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| CN102064459A (en) * | 2010-11-26 | 2011-05-18 | 中国电子科技集团公司第十一研究所 | Pump device with crystals having linear polarization absorption characteristic |
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