CN102468600B - A kind of novel cross-polarization dual laser - Google Patents
A kind of novel cross-polarization dual laser Download PDFInfo
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- CN102468600B CN102468600B CN201110242659.4A CN201110242659A CN102468600B CN 102468600 B CN102468600 B CN 102468600B CN 201110242659 A CN201110242659 A CN 201110242659A CN 102468600 B CN102468600 B CN 102468600B
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Abstract
The invention provides a kind of novel cross-polarization dual laser, can realize the wavelength one of the close horizontal polarization of wavelength and the wavelength two cross-polarization dual-wavelength laser of vertical polarization by same output coupling mirror simultaneously same light path export, belong to field of optoelectronic devices.This laser comprises anisotropic neodymium-doped laser crystal; For laser crystal described in pumping to make the active ions (Nd in described laser crystal
3+ion) formed population inversion distribution pumping system; And the optical resonator of wavelength two dual wavelength radiation of the wavelength one of active ions transition emission level polarization and vertical polarization resonance wherein.Cross-polarization dual laser provides a kind of novel LASER Light Source, for obtain high power, high relevant and frequently or difference frequency (THz radiated wave) laser new technological approaches is provided, the application of dual-wavelength laser can be expanded, be with a wide range of applications and use value in the field such as nonlinear frequency conversion, optical fiber communication.
Description
Technical field
The present invention relates to a kind of novel solid dual laser that can export the mutually orthogonal dual-wavelength laser of two kinds of polarization states, belong to field of optoelectronic devices.
Background technology
Solid dual-wavelength laser can be widely used in the fields such as nonlinear frequency conversion, laser radar, satellite ranging, environmental monitoring, photodynamics medical treatment and spectrum selective materials, particularly in nonlinear frequency conversion, utilize solid dual-wavelength laser to carry out in recent years and frequently or difference frequency become the important technology approach obtaining and there is special purpose laser with new wavelength, as utilize 1 micron and 1.3 microns of dual-wavelength lasers by and frequency to generate yellow light and orange light; The dual-wavelength laser close according to wavelength also can obtain relevant THz radiated wave by difference frequency technology.Therefore, the research of solid dual-wavelength laser is subject to people's attention day by day, has become comparatively popular research topic both at home and abroad.
Up to now, the solid dual-wavelength laser reported, with regard to polarization characteristic, mainly contains two types, a kind of be utilize isotropic laser crystal to obtain without inclined dual-wavelength laser, as Nd:YAG crystal launch 1357nm and 1444nm dual-wavelength laser; Another kind is the single polarization direction dual-wavelength laser utilizing anisotropic laser crystal to obtain, as Nd:YAlO
3(Nd:YAP) 1079nm and the 1341nm dual-wavelength laser of crystal transmitting.The above-mentioned solid dual-wavelength laser without inclined or single polarization direction, has its limitation and deficiency in the application.As without inclined dual-wavelength laser, when inciding nonlinear optical crystal and carrying out frequency inverted, no matter be employing I class (e+e=o or o+o=e) or II class (o+e=o or e+o=e) phase matched, only have the laser polarization component meeting phase matched to participate in and (or difference frequency) effect frequently, cause frequency conversion efficiency lower.Especially some nonlinear optical crystal, nonlinear optical crystal KTP as representational in middle low power aspect most, when carrying out frequency inverted, can only adopt II class (o+e=o or e+o=e) phase matched, the frequency conversion efficiency without the solid dual-wavelength laser of inclined or single polarization direction awaits further raising especially.In addition, carry out with time frequently to the dual-wavelength laser of single polarization direction, produce and while frequency light, also can produce respective frequency doubled light, directly affects the spectral purity with efficiency frequently and frequency conversion light.When 1319nm and the 1338nm dual-wavelength laser that we utilize Nd:YAG crystal to launch simultaneously in the recent period carries out and frequently tests, no matter whether inclined 1319nm and 1338nm dual-wavelength laser rise, all observed 664nm and frequency light and 659.5nm and 669nm frequency doubled light, the ratio of three is 23:16:11(H.Y.Zhu, G.Zhang, C.H.Huang, Y.Wei, L.X.Huang, A.H.LiandZ.Q.Chen. " 1318.8nm/1338.2nmsimultaneousdual-wavelengthQ-switchedNd: YAGlaser ", Appl.Phys.B, 90 (2008) 451-454).Therefore, how improving the spectral purity of frequency conversion efficiency and frequency conversion light, is solid dual-wavelength laser problem demanding prompt solution in nonlinear frequency conversion process.For this reason, if the polarization direction of the dual-wavelength laser of our imagination output is mutually orthogonal, II class can be adopted during frequency inverted to mate, each polarized component all fully can participate in and in frequency (or difference frequency) process, effectively will improve frequency conversion efficiency; Especially when with frequency, avoid the generation of respective frequency doubled light, greatly can improve spectral purity.
In addition, dual-wavelength laser is widely used in optical fiber communication.In recent years, rapidly, information superhighway is just set up in the world with surprising rapidity in communications industry development.The future development that Fibre Optical Communication Technology is high towards speed, capacity is large, scalability is good.In order to increase capacity and the speed of network throughput, effective solution route adopts wavelength division multiplexing (WavelengthDivisionMultiplex, WDM) technology exactly.Apply this technology and can transmit two or more different wave length light signal in same optical fiber simultaneously.Cross-polarization dual-wavelength laser provides a kind of new signal carrier LASER Light Source in optical fibre wavelength-division multiplex technology.Because same light path is launched and polarization direction is mutually orthogonal simultaneously, cross-polarization dual-wavelength laser is applied to optical fiber communication, then different optical carriers is not only in the easy compound access of transmitting terminal, and also easily to decode separation at receiving terminal, this is conducive to the cost reducing optical fiber communication undoubtedly, has potential application prospect.
As far as we know, there is not yet the research report about cross-polarization dual-wavelength laser exports at present both at home and abroad, only have the research being realized the large frequency-difference cross-polarization double-frequency laser in Same Wavelength by frequency splitting technology.Large frequency-difference cross-polarization two-frequency laser has important application in fields such as absolute distance interferometry and laser communications.But this double-frequency laser is in fact two division frequency moulds of same laser radiation wavelength, by gain line tolerance system, the frequency difference of the cross-polarization double-frequency laser that this method obtains can only reach at most the limit of solid state laser gain live width.The cross-polarization dual-wavelength laser adopting different energy level or oidiospore energy level transition to produce, not by the restriction of solid state laser singlet line gain live width, can produce larger frequency difference, expands its application.
Compare isotropic solid laser material, the natural anisotropy transition energy level structure of anisotropic solid laser material is provided convenience for studying and obtaining cross-polarization dual wavelength Solid State Laser.The cross-polarization characteristic that the different wave length utilizing the transition between the different energy levels of anisotropic laser crystals and sub-energy level thereof to produce different polarization has, the cross-polarization dual-wavelength laser that can realize multiple combination exports.For the Nd:YAP crystal of b axle cutting, Nd
3+two energy level transitions that ion is conventional
4f
3/2-
4i
11/2with
4f
3/2-
4i
13/2due to Stark energy level division, 1080nm and the 1341nm radiation of c polarization and 1064nm and the 1339nm radiation of a polarization can be produced.Utilize this 4 transition spectral lines, the cross-polarization dual-wavelength laser research of 4 kinds of combinations can be carried out, be respectively 1064nm and 1341nm, 1080nm and 1339nm, 1064nm and 1080nm, 1339nm and 1341nm cross-polarization dual-wavelength laser.
Anyly select deflection device if do not added, the dual-wavelength laser that anisotropic laser crystal exports is linearly polarized laser, and by light splitting and Polarization Control, realizes cross-polarization dual-wavelength laser same light path exports simultaneously being completely possible.
Summary of the invention
The object of the invention is to utilize now widely used anisotropic solid laser material can launch the characteristic of multiple different polarization different wave length radiation, by rational cavity effects and Polarization Control, develop a kind of novel cross-polarization dual laser, a laser realizes the mutually orthogonal dual-wavelength laser in wavelength 2 two kinds of polarization directions of the wavelength one of horizontal polarization and vertical polarization simultaneously same light path export.
To achieve these goals, the present invention adopts following technical scheme:
1. a novel cross-polarization dual laser, is characterized in that: this laser comprises anisotropic neodymium-doped laser crystal; For laser crystal described in pumping to make the active ions (Nd in described laser crystal
3+ion) formed population inversion distribution pumping system; The optical resonator of the wavelength one of active ions transition emission level polarization and wavelength two dual wavelength radiation of vertical polarization resonance wherein; And the cooling system of laser aid.
2. the novel cross-polarization dual laser as described in item 1, it is characterized in that: described optical resonator comprises resonant cavity one resonant cavity two, resonant cavity one is made up of spectroscope (3) and output coupling mirror (5), and resonant cavity two is made up of speculum (1) and output coupling mirror (5); Output coupling mirror (5) plates the deielectric-coating to wavelength one and the equal component permeate of wavelength two; Spectroscope (3) plating is all-trans to wavelength one, to the high saturating deielectric-coating of wavelength two; Speculum (1) plates the deielectric-coating be all-trans to wavelength two; Polarizer (2) inserts between speculum (1) and spectroscope (3), to the laser light of vertical polarization; Wavelength one laser of horizontal polarization vibrates in resonant cavity one; The wavelength dual-laser of vertical polarization vibrates in resonant cavity two through spectroscope (3) and polarizer (2); The wavelength one of horizontal polarization and the wavelength two cross-polarization dual-wavelength laser of vertical polarization are by output coupling mirror (5) same light path output simultaneously.
3. the novel cross-polarization dual laser as described in item 1, is characterized in that: described anisotropic neodymium-doped laser crystal is Nd:YAlO
3, Nd:YLiF
4(Nd:YLF), Nd:YVO
4or Nd:GdVO
4in crystal.
4. the novel cross-polarization dual laser as described in item 1, is characterized in that: the pumping source of described pumping system comprises continuous, the pulse or repetition rate pulsed drive source that can continuously change input power or energy and as the krypton lamp of pumping lamp or xenon lamp.
5. the novel cross-polarization dual laser as described in item 1, is characterized in that: the pumping source of described pumping system is laser diode and drive source thereof.
6. the novel cross-polarization dual laser as described in item 1, is characterized in that: comprise and adjust Q and locked mode element, produces tune Q and the mode-locked laser of ns and ps level.
7. the novel cross-polarization dual laser as described in item 1, is characterized in that: comprise the nonlinear optical crystal in chamber or outside chamber, light path placed, and produces and frequency laser or difference frequency laser.
The pump light of laser crystal (4) absorptive pumping system (6), is in excitation state, and wavelength one laser producing horizontal polarization vibrates between spectroscope (3) and output coupling mirror (5); The wavelength dual-laser producing vertical polarization vibrates between speculum (1) and output coupling mirror (5) through spectroscope (3) and polarizer (2), and the wavelength one that final polarization direction is mutually orthogonal and wavelength two dual-wavelength laser are by output coupling mirror (5) same light path output simultaneously.Be equipped with the drive source of different mode, can simultaneously same light path export continuously, the wavelength one of pulse or repetition rate pulse and wavelength two cross-polarization dual-wavelength laser, meet the different needs.
As the cross-polarization dual-wavelength laser of ns or ps level need be produced, only need insert in chamber and adjust Q or locked mode element.If light path is placed in chamber or outside chamber nonlinear optical crystal (as KTP, LBO etc.), cross-polarization dual-wavelength laser can carry out nonlinear frequency conversion, produces and frequency laser or difference frequency laser.
For the heat that different pumping system pumped laser crvstal produces, then adopt corresponding cooling system to extract.
, chamber mirror long by the chamber of adjustment resonant cavity one resonant cavity two, to the coupling efficiency of different wave length, can obtain balanced cross-polarization dual-wavelength laser and export.
Adopt this design, a laser exports the mutually orthogonal dual-wavelength laser in polarization direction.Compare the different Single wavelength laser of two laser output line polarizations, cross-polarization dual laser use only a laser bar and a set of pumping and cooling system, reduces volume, provides cost savings.Simultaneously, cross-polarization dual-wavelength laser is as a kind of novel LASER Light Source, making up traditional double wavelength laser due to polarization characteristic limits to the deficiency caused, for obtain high power, high relevant and frequently or difference frequency (THz radiated wave) laser new technological approaches is provided, the application of dual-wavelength laser can be expanded, be with a wide range of applications and use value in the field such as nonlinear frequency conversion, optical fiber communication.
Accompanying drawing explanation
Accompanying drawing 1, the structural representation for a kind of novel cross-polarization dual laser device: 1, speculum; 2, polarizer; 3, spectroscope; 4, laser crystal; 5, output coupling mirror; 6, pumping system.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described, in figure:
1 is speculum, plates the deielectric-coating be all-trans to wavelength two.
2 is polarizer, to the laser light of vertical polarization.
3 is spectroscope, plates and is all-trans to wavelength one, to the high saturating deielectric-coating of wavelength two.
4 is laser crystal, as Nd:YAP, Nd:YLF, Nd:YVO
4, Nd:GdVO
4etc. the one in anisotropic neodymium-doped laser crystal, the polishing of laser crystal two ends and plating wavelength one and the anti-reflection deielectric-coating of wavelength two.
5 is output coupling mirror, plates the deielectric-coating to wavelength one and the equal component permeate of wavelength two.
6 is pumping system, comprising pump light source and driving power thereof, can be can continuously change continuous, the pulse of input power or energy or repetition rate pulsed drive source and as the krypton lamp of pumping lamp or xenon lamp or multiple laser diode (LD) profile pump and drive source thereof.
Illustrate that (polarization direction of 1341nm spectral line is parallel to the c-axis of Nd:YAP crystal to the specific embodiment of the present invention, defines the wavelength one that 1341nm spectral line is horizontal polarization in this instance for the 1064nm cross-polarization dual-wavelength laser of 1341nm and a polarization of the Nd:YAP laser bar generation c polarization of b axle cutting below; The polarization direction of 1064nm spectral line is parallel to a axle of Nd:YAP crystal, defines the wavelength two that 1064nm spectral line is vertical polarization in this instance).
Speculum (1) plates the deielectric-coating be all-trans to 1064nm.Polarizer (2) inserts between speculum (1) and spectroscope (3), to the 1064nm laser light of vertical polarization.Spectroscope (3) plating is all-trans to 1341nm, to the anti-reflection deielectric-coating of 1064nm.Laser crystal (4) adopts the Nd:YAP laser bar of b axle cutting, two ends polishing and the anti-reflection film of plating to 1341nm and 1064nm, allows a direction of principal axis of laser bar consistent through the direction of laser with polarizer (2) during placement.The deielectric-coating of output coupling mirror (5) plating to the equal component permeate of 1341nm and 1064nm.Pumping system (6) adopts krypton lamp or xenon flash lamp pumping or multiple 808nm laser diode (LD) profile pump.The pump light of Nd:YAP laser bar absorptive pumping system (6), is in excitation state, and the 1341nm laser producing horizontal polarization vibrates between spectroscope (3) and output coupling mirror (5); Producing the 1064nm laser of vertical polarization through spectroscope (3) vibrate between speculum (1) and output coupling mirror (5) through polarizer (2), and final 1341nm and 1064nm cross-polarization dual-wavelength laser is by same light path output while of output coupling mirror (5).Be equipped with the drive source of different mode, 1341nm and the 1064nm cross-polarization dual-wavelength laser of different mode can be exported by same light path simultaneously.As the cross-polarization dual-wavelength laser of ns or ps level need be produced, in each resonant cavity, only need insert tune Q or the locked mode element of 1341nm and 1064nm wavelength respectively.If light path is placed in chamber or outside chamber nonlinear optical crystal (as KTP, LBO etc.), 1341nm and 1064nm cross-polarization dual-wavelength laser can carry out nonlinear frequency conversion, as produced 593nm laser with frequency.
Claims (5)
1. a cross-polarization dual laser, this laser comprises anisotropic neodymium-doped laser crystal; For laser crystal described in pumping to make the active ions in described laser crystal, Nd
3+ion, forms the pumping system of population inversion distribution; The optical resonator of the wavelength one of active ions transition emission level polarization and wavelength two dual wavelength radiation of vertical polarization resonance wherein; And the cooling system of laser aid, it is characterized in that: described optical resonator comprises resonant cavity one resonant cavity two, resonant cavity one is made up of spectroscope (3) and output coupling mirror (5), and resonant cavity two is made up of speculum (1) and output coupling mirror (5); Output coupling mirror (5) plates the deielectric-coating to wavelength one and the equal component permeate of wavelength two; Spectroscope (3) plating is all-trans to wavelength one, to the high saturating deielectric-coating of wavelength two; Speculum (1) plates the deielectric-coating be all-trans to wavelength two; Polarizer (2) inserts between speculum (1) and spectroscope (3), to the laser light of vertical polarization; Wavelength one laser of horizontal polarization vibrates in resonant cavity one; The wavelength dual-laser of vertical polarization vibrates in resonant cavity two through spectroscope (3) and polarizer (2); The wavelength one of horizontal polarization and the wavelength two cross-polarization dual-wavelength laser of vertical polarization are by output coupling mirror (5) same light path output simultaneously.
2. cross-polarization dual laser as claimed in claim 1, is characterized in that: described anisotropic neodymium-doped laser crystal is Nd:YAlO
3, Nd:YLiF
4, Nd:YVO
4or Nd:GdVO
4.
3. cross-polarization dual laser as claimed in claim 1, is characterized in that: the pumping source of described pumping system comprises continuous, the pulsed drive source that can continuously change input power or energy and as the krypton lamp of pumping lamp or xenon lamp.
4. cross-polarization dual laser as claimed in claim 1, is characterized in that: the pumping source of described pumping system is laser diode and drive source thereof.
5. cross-polarization dual laser as claimed in claim 1, is characterized in that: comprise the nonlinear optical crystal or outside chamber, light path placed in the chamber in, generation and frequency laser or difference frequency laser.
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CN103872572B (en) * | 2014-03-13 | 2019-03-08 | 中国科学院福建物质结构研究所 | A kind of self Q switch, cross-polarization double-wavelength pulse laser |
US10968704B2 (en) * | 2018-02-22 | 2021-04-06 | Saudi Arabian Oil Company | In-situ laser generator cooling system for downhole application and stimulations |
CN108631145A (en) * | 2018-05-08 | 2018-10-09 | 齐鲁工业大学 | A kind of discrete controllable dual wavelengh synchronized mode-locked laser of laser intensity |
CN114336253A (en) * | 2022-03-15 | 2022-04-12 | 广东粤港澳大湾区硬科技创新研究院 | Multi-wavelength medical cosmetic laser |
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CN101499604A (en) * | 2008-01-31 | 2009-08-05 | 中国科学院福建物质结构研究所 | Dual wavelength frequency double laser |
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CN106374329A (en) * | 2016-12-01 | 2017-02-01 | 江苏师范大学 | Cross-polarization dual-wavelength synchronous resonation mode-locked laser |
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