CN102195229A - Novel orthogonal-polarization dual-wavelength laser - Google Patents
Novel orthogonal-polarization dual-wavelength laser Download PDFInfo
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Abstract
The invention discloses a novel orthogonal-polarization dual-wavelength laser which belongs to a novel laser and is a dual-wavelength continuous pulse laser or a dual-wavelength repetition-rate pulse laser realizing mutual orthogonality of a horizontal polarized wavelength 1 and a vertical polarized wavelength 2 in polarization directions by adopting an anisotropic neodymium-doped laser crystal with a multichannel transition property. The laser device comprises the anisotropic neodymium-doped laser crystal, such as Nd:YAlO3, Nd:YVO4, Nd:YLF or Nd:GdVO4 and other crystals, a pumping system and an optical resonant cavity, wherein the pumping system is used for pumping the laser crystal to enable active ions (Nd<3+> ions) in the laser crystal to form distribution for population inversion; the optical resonant cavity is used for the resonation of dual-wavelength radiation of the horizontal polarized wavelength 1 and the vertical polarized wavelength 2 of the active ions in transmission emission; and finally, orthogonal-polarization dual-wavelength laser of the horizontal polarized wavelength 1 and the vertical polarized wavelength 2 are simultaneously outputted in the same light path both by the same output coupling mirror. The orthogonal-polarization dual-wavelength laser provides a novel laser source and a novel technical approach to acquisition of high-power, high-coherence or difference-frequency (THz radiation waves) laser, can broaden the application of dual-wavelength laser, and has a broad application prospect and use values in the fields of non-linearity frequency conversion, fiber-optic communication and the like.
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
The solid dual-wavelength laser can be widely used in fields such as non-linear frequency conversion, laser radar, satellite ranging, environmental monitoring, photodynamics medical treatment and spectroscopy research, particularly aspect the non-linear frequency conversion, utilize the solid dual-wavelength laser to carry out in recent years and frequently or difference frequency become and obtained to have the important technology approach of special purpose laser with new wavelength, as utilize 1 micron and 1.3 microns dual-wavelength lasers by and frequency to generate yellow light and orange light; If adopt the close dual-wavelength laser of wavelength also can obtain relevant THz radiated wave by the 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 of being reported mainly contains two types with regard to polarization characteristic, and a kind of is the no inclined to one side dual-wavelength laser that utilizes isotropic laser crystal to obtain, as the 1357nm and the 1444nm dual-wavelength laser of Nd:YAG crystal emission; Another kind is the single polarization direction dual-wavelength laser that utilizes anisotropic laser crystal to obtain, as Nd:YAlO
3The 1079nm and the 1341nm dual-wavelength laser of crystal emission.The above-mentioned no inclined to one side or solid dual-wavelength laser of single polarization direction has its limitation and deficiency in application.As there is not an inclined to one side dual-wavelength laser, when inciding nonlinear crystal and carry out frequency inverted, no matter be to adopt I class (e+e=o or o+o=e) or II class (o+e=o or e+o=e) phase matched, have only the laser polarization component that satisfies phase matched to participate in and (or difference frequency) effect frequently, cause frequency conversion efficiency lower.Especially some nonlinear crystal, as the most representative nonlinear crystal KTP in middle low power aspect, when carrying out frequency inverted, can only adopt II class (o+e=o or e+o=e) phase matched, the frequency conversion efficiency of the solid dual-wavelength laser of no inclined to one side or single polarization direction awaits further raising especially.In addition, the dual-wavelength laser of single polarization direction is carried out and frequently the time, produce and frequently light the time, also can produce frequency doubled light separately, directly influenced and the efficient frequently and the spectral purity of frequency conversion light.We utilize the 1319nm that the Nd:YAG crystal launches simultaneously and the 1338nm dual-wavelength laser carries out and when frequently testing in the recent period, no matter whether partially 1319nm and 1338nm dual-wavelength laser rise, 664nm and frequency light and 659.5nm and 669nm frequency doubled light have all been observed, three's ratio is 23: 16: 11 (H.Y.Zhu, G.Zhang, C.H.Huang, Y.Wei, L.X.Huang, A.H.Li andZ.Q.Chen. " 1318.8nm/1338.2nm simultaneous dual-wavelength Q-switchedNd:YAG laser ", 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 the non-linear frequency transfer process.For this reason,, can adopt II class coupling during frequency inverted if the polarization direction of the dual-wavelength laser of our imagination output is mutually orthogonal, each polarized component all can fully participate in and frequency (or difference frequency) process in, will effectively improve frequency conversion efficiency; Especially with frequency the time, avoid the generation of frequency doubled light separately, can improve spectral purity greatly.
In addition, dual-wavelength laser is widely used aspect optical fiber communication.In recent years, communications industry development is rapid, and information superhighway is just set up in the world with surprising rapidity.Fibre Optical Communication Technology develops towards speed height, capacity direction big, that scalability is good.In order to increase capacity and the speed that network is handled up, effectively solution route adopts wavelength division multiplexing (Wavelength Division Multiplex, WDM) technology exactly.Use this technology and can in same optical fiber, transmit two or more different wave length light signals simultaneously.The cross-polarization dual-wavelength laser provides a kind of new signal carrier LASER Light Source in the optical fibre wavelength-division multiplex technology.Since with light path launch simultaneously and the polarization direction mutually orthogonal, the 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 at receiving terminal also decoding separation easily, the cost that this helps reducing optical fiber communication undoubtedly has potential application prospect.
As far as we know, do not see the research report of relevant cross-polarization dual-wavelength laser output at present both at home and abroad as yet, have only the research that realizes the large frequency-difference cross-polarization double-frequency laser in the same wavelength by the frequency splitting technology.Large frequency-difference cross-polarization two-frequency laser has important application in fields such as absolute distance interferometry and laser communications.Yet this double-frequency laser comes down to two division frequency moulds of same laser radiation wavelength, and the line width limit that gained, the frequency difference of the cross-polarization double-frequency laser that this method obtains can only reach the limit of solid state laser gain live width at most.The cross-polarization dual-wavelength laser that adopts different energy levels or oidiospore energy level transition to produce is not subjected to the restriction of solid state laser singlet line gain live width, can produce bigger frequency difference, expands its application.
The abundant transition energy level structure of anisotropic solid laser material provides possibility for studying and obtaining cross-polarization dual wavelength Solid State Laser.The radiation that transition between their different energy levels or the sub-energy level can produce multiple different polarization different wave length is the perfect medium of research cross-polarization dual-wavelength laser.With Nd:YAlO
3Crystal is an example, Nd
3+Two energy level transitions that ion is commonly used
4F
3/2-
4I
11/2With
4F
3/2-
4I
13/2Because 1064nm and 1339nm radiation that the Stark energy level splitting can produce 1080nm and the 1341nm radiation and a polarization of c polarization.Utilize the transition between different energy levels and the sub-energy level thereof, can carry out the cross-polarization dual-wavelength laser research of multiple combination, as: the combination of 1064nm and 1341nm, 1080nm and 1339nm cross-polarization dual-wavelength laser, the combination of 1064nm and 1080nm, 1339nm and 1341nm cross-polarization dual-wavelength laser.
If do not add any deflection device that selects, the dual-wavelength laser of the laser crystal of anisotropic output is a linearly polarized laser, and by beam split and Polarization Control, realizes that the cross-polarization dual-wavelength laser is fully possible with light path output simultaneously.
Summary of the invention
The objective of the invention is to utilize present widely used anisotropic solid laser material can launch the characteristic of multiple different polarization different wave length radiation, by design of rational chamber type and Polarization Control, develop a kind of novel cross-polarization dual laser, the mutually orthogonal dual-wavelength laser in 2 two kinds of polarization directions of wavelength of the wavelength one of realization horizontal polarization and vertical polarization is exported with light path simultaneously on a laser.
To achieve these goals, the present invention adopts following technical scheme:
1. novel cross-polarization dual laser, it is characterized in that: this laser comprises anisotropic neodymium-doped laser crystal; Be used for the described laser crystal of pumping so that the active ions (Nd of described laser crystal
3+Ion) forms the pumping system that population inversion distributes; The wavelength two dual wavelength radiation of the wavelength one of active ions transition emission level polarization and vertical polarization are the optical resonator of resonance therein; And the cooling system of laser aid.
2. as 1 a described novel cross-polarization dual laser, it is characterized in that: described optical resonator comprises straight line resonant cavity and fold resonator, the straight line resonant cavity is made up of first speculum (1) and output coupling mirror (4), and fold resonator is made up of second speculum (6) and output coupling mirror (4); First speculum (1) plating to wavelength one be all-trans, to wavelength two high saturating deielectric-coating; Second speculum (6) plating to wavelength two be all-trans, to wavelength one high saturating deielectric-coating; Light-dividing device (2) inserts between straight line resonant cavity interior first speculum (1) and laser crystal (3), and is anti-reflection to wavelength one, and wavelength two is all-trans; The deielectric-coating that output coupling mirror (4) plating sees through wavelength one and wavelength two parts; Polarizer (5) inserts between the light-dividing device (2) and second speculum (6) in the fold resonator, and the laser of vertical polarization is seen through; Wavelength one laser of horizontal polarization vibrates in the straight line resonant cavity; The wavelength dual-laser of vertical polarization vibrates in fold resonator through light-dividing device (2) beam split and through polarizer (5); The wavelength one of horizontal polarization and the wavelength of vertical polarization two cross-polarization dual-wavelength lasers are exported with light path by output coupling mirror (4) simultaneously.
3. as 1 a described novel cross-polarization dual laser, it is characterized in that: described anisotropic neodymium-doped laser crystal is Nd:YAlO
3, Nd:YVO
4, Nd:YLF or Nd:GdVO
4In crystal.
4. as 1 a described novel cross-polarization dual laser, it is characterized in that: the pumping source of described pumping system comprise can continuously change input power or energy continuously, pulse or repetition rate pulsed drive source and as the krypton lamp or the xenon lamp of pumping lamp.
5. as 1 a described novel cross-polarization dual laser, it is characterized in that: the pumping source of described pumping system is laser diode and drive source thereof.
6. as 1 a described novel cross-polarization dual laser, it is characterized in that: comprise and transfer Q and locked mode element, produce the accent Q and the mode-locked laser of ns and ps level.
The pump light of laser crystal (3) absorptive pumping system (7) is in excitation state, and wavelength one laser that produces horizontal polarization vibrates between first speculum (1) and output coupling mirror (4); The wavelength dual-laser that produces vertical polarization vibrates between second speculum (6) and output coupling mirror (4) through light-dividing device (2) beam split and through polarizer (5), and wavelength one and wavelength two dual-wavelength lasers that final polarization direction is mutually orthogonal are exported with light path by output coupling mirror (4) simultaneously.Be equipped with the drive source of different mode, can be simultaneously with light path output continuously, the wavelength one and the wavelength two cross-polarization dual-wavelength lasers of pulse or repetition rate pulse, meet the different needs.
As the cross-polarization dual-wavelength laser of need generation ns or ps level, only need in the chamber, to insert and transfer Q or locked mode element.Heat for different pumping system pumping laser crystal produce then adopts corresponding cooling to extract.
, chamber mirror long by the chamber of adjusting straight line resonant cavity and fold resonator can obtain balanced cross-polarization dual-wavelength laser output to the coupling efficiency of different wave length.
Adopt this design, the mutually orthogonal dual-wavelength laser of laser output polarization direction.Compare different single wavelength laser of two laser output line polarizations, the cross-polarization dual laser has only adopted a laser bar and a cover pumping and a cooling system, has reduced volume, provides cost savings.Simultaneously, the cross-polarization dual-wavelength laser is as 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, can expand the application of dual-wavelength laser, be with a wide range of applications and use value in fields such as non-linear frequency conversion, optical fiber communications.
Description of drawings
Accompanying drawing 1 is the structural representation of cross-polarization dual-wavelength laser apparatus: 1, the first speculum; 2, light-dividing device; 3, laser crystal; 4, output coupling mirror; 5, polarizer; 6, the second speculums; 7, pumping system.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing, among the figure:
1 is first speculum, plating to wavelength one be all-trans, to the high saturating deielectric-coating of wavelength two.
2 is light-dividing device, anti-reflection to wavelength one, and wavelength two is all-trans.
3 is laser crystal, as Nd:YVO
4, Nd:YAlO
3, Nd:GdVO
4, a kind of in the anisotropic neodymium-doped laser crystal such as Nd:YLF, the anti-reflection film of the polishing of laser crystal two ends and plating wavelength one and wavelength two.
4 is output coupling mirror, the deielectric-coating that plating sees through wavelength one and wavelength two parts.
5 is polarizer, and the laser of vertical polarization is seen through
6 is second speculum, plating to wavelength two be all-trans, to the high saturating deielectric-coating of wavelength one.
7 is pumping system, comprise pump light source and driving power thereof, can be can continuously change input power or energy continuously, pulse or repetition rate pulsed drive source and as krypton lamp or xenon lamp or a plurality of laser diode (LD) profile pump and the drive source thereof of pumping lamp.
Below with the Nd:YAlO of b axle cutting
3Laser bar produces 1341nm and 1064nm cross-polarization dual-wavelength laser is that (polarization direction of 1341nm spectral line is parallel to Nd:YAlO to example explanation the specific embodiment of the present invention
3The c axle of crystal, definition 1341nm spectral line is the wavelength one of horizontal polarization in this example; The polarization direction of 1064nm spectral line is parallel to Nd:YAlO
3The a axle of crystal, definition 1064nm spectral line is the wavelength two of vertical polarization in this example).
First speculum (1) plating to 1341nm be all-trans, to the high saturating deielectric-coating of 1064nm.Light-dividing device (2) is anti-reflection to 1341nm, and 1064nm is all-trans.Laser crystal (3) adopts the Nd:YAlO of b axle cutting
3Laser bar, two ends polishing and plating are to the anti-reflection film of 1341nm and 1064nm.The deielectric-coating that output coupling mirror (4) plating partly sees through 1341nm and 1064nm.Polarizer (5) inserts between the light-dividing device (2) and second speculum (6) in the fold resonator, and the 1064nm of vertical polarization is seen through.Second speculum (6) plating to 1064nm be all-trans, to the high saturating deielectric-coating of 1341nm.Pumping system (7) adopts krypton lamp or xenon flash lamp pumping or a plurality of 808nm laser diode (LD) profile pump.Nd:YAlO
3The pump light of laser bar absorptive pumping system (7) is in excitation state, and the 1341nm laser that produces horizontal polarization vibrates between first speculum (1) and output coupling mirror (4); The 1064nm laser that produces vertical polarization vibrates between second speculum (6) and output coupling mirror (4) through light-dividing device (2) beam split and through polarizer (5), and final 1341nm and 1064nm cross-polarization dual-wavelength laser are exported with light path by output coupling mirror (4) simultaneously.Be equipped with the drive source of different mode, can export the 1341nm and the 1064nm cross-polarization dual-wavelength laser of different mode simultaneously with light path.As the cross-polarization dual-wavelength laser of need generation ns or ps level, only need in the chamber, to insert the accent Q or the locked mode element of 1341nm and 1064nm wavelength.
Claims (6)
1. novel cross-polarization dual laser, it is characterized in that: this laser comprises anisotropic neodymium-doped laser crystal; Be used for the described laser crystal of pumping so that the active ions of described laser crystal form the pumping system that population inversion distributes; The wavelength two dual wavelength radiation of the wavelength one of active ions transition emission level polarization and vertical polarization are the optical resonator of resonance therein; And the cooling system of laser aid.
2. novel cross-polarization dual laser as claimed in claim 1, it is characterized in that: described optical resonator comprises straight line resonant cavity and fold resonator, the straight line resonant cavity is made up of first speculum (1) and output coupling mirror (4), and fold resonator is made up of second speculum (6) and output coupling mirror (4); First speculum (1) plating to wavelength one be all-trans, to wavelength two high saturating deielectric-coating; Second speculum (6) plating to wavelength two be all-trans, to wavelength one high saturating deielectric-coating; Light-dividing device (2) inserts between straight line resonant cavity interior first speculum (1) and laser crystal (3), and is anti-reflection to wavelength one, and wavelength two is all-trans; The deielectric-coating that output coupling mirror (4) plating sees through wavelength one and wavelength two parts; Polarizer (5) inserts between the light-dividing device (2) and second speculum (6) in the fold resonator, and the laser of vertical polarization is seen through; Wavelength one laser of horizontal polarization vibrates in the straight line resonant cavity; The wavelength dual-laser of vertical polarization vibrates in fold resonator through light-dividing device (2) beam split and through polarizer (5); The wavelength one of horizontal polarization and the wavelength of vertical polarization two cross-polarization dual-wavelength lasers are exported with light path by output coupling mirror (4) simultaneously.
3. novel cross-polarization dual laser as claimed in claim 1, its feature are at hand: described anisotropic neodymium-doped laser crystal is Nd:YAlO
3, Nd:YVO
4, Nd:YLF or Nd:GdVO
4In crystal.
4. novel cross-polarization dual laser as claimed in claim 1 is characterized in that: the pumping source of described pumping system comprise can continuously change input power or energy continuously, pulse or repetition rate pulsed drive source and as the krypton lamp or the xenon lamp of pumping lamp.
5. novel 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.
6. novel cross-polarization dual laser as claimed in claim 1 is characterized in that: comprise and transfer Q and locked mode element, produce the accent Q and the mode-locked laser of ns and ps level.
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| CN201010116330.9A CN102195229B (en) | 2010-03-02 | 2010-03-02 | Novel orthogonal-polarization dual-wavelength laser |
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|---|---|---|---|
| CN201010116330.9A CN102195229B (en) | 2010-03-02 | 2010-03-02 | Novel orthogonal-polarization dual-wavelength laser |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194788A (en) * | 2013-04-17 | 2013-07-10 | 清华大学 | Preparation, characterization and application methods of anisotropic medium crystal in THz (Terahertz) frequency band |
| CN106684683A (en) * | 2016-12-15 | 2017-05-17 | 西北大学 | Continuous/pulse superposition type single-beam solid laser |
| WO2018035813A1 (en) * | 2016-08-25 | 2018-03-01 | 深圳大学 | Dual-frequency optical source |
| CN109149351B (en) * | 2018-10-16 | 2020-02-21 | 中国科学院福建物质结构研究所 | Q-switched laser |
| CN111180987A (en) * | 2020-01-09 | 2020-05-19 | 天津大学 | Orthogonal polarization dual-wavelength laser with adjustable power proportion |
| CN111418118A (en) * | 2017-11-29 | 2020-07-14 | 海拉有限双合股份公司 | Laser source unit and method for generating laser light for a vehicle |
| WO2020155249A1 (en) * | 2019-01-31 | 2020-08-06 | 深圳大学 | Dual-frequency light source |
| CN112421363A (en) * | 2020-11-17 | 2021-02-26 | 长春理工大学 | Based on Nd, MgO, LiNbO3Cross-polarization dual-wavelength free regulation switching laser of crystal |
| WO2022166102A1 (en) * | 2021-02-02 | 2022-08-11 | 长春理工大学 | Servo matching control mid-infrared differential dual-wavelength laser based on multi-period nd:mgo:ppln |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009022291A2 (en) * | 2007-08-16 | 2009-02-19 | Philips Intellectual Property & Standards Gmbh | Switchable dual wavelength solid state laser |
| 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 |
-
2010
- 2010-03-02 CN CN201010116330.9A patent/CN102195229B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009022291A2 (en) * | 2007-08-16 | 2009-02-19 | Philips Intellectual Property & Standards Gmbh | Switchable dual wavelength solid state laser |
| 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 |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194788B (en) * | 2013-04-17 | 2016-03-23 | 清华大学 | The preparation of Terahertz frequency range anisotropic medium crystal, sign and application method |
| CN103194788A (en) * | 2013-04-17 | 2013-07-10 | 清华大学 | Preparation, characterization and application methods of anisotropic medium crystal in THz (Terahertz) frequency band |
| WO2018035813A1 (en) * | 2016-08-25 | 2018-03-01 | 深圳大学 | Dual-frequency optical source |
| CN106684683A (en) * | 2016-12-15 | 2017-05-17 | 西北大学 | Continuous/pulse superposition type single-beam solid laser |
| CN106684683B (en) * | 2016-12-15 | 2018-12-21 | 西北大学 | Continuous and superimposed pulses formula single beam solid state laser |
| CN111418118B (en) * | 2017-11-29 | 2023-09-05 | 海拉有限双合股份公司 | Laser source unit and method for generating laser for vehicle |
| CN111418118A (en) * | 2017-11-29 | 2020-07-14 | 海拉有限双合股份公司 | Laser source unit and method for generating laser light for a vehicle |
| CN109149351B (en) * | 2018-10-16 | 2020-02-21 | 中国科学院福建物质结构研究所 | Q-switched laser |
| WO2020155249A1 (en) * | 2019-01-31 | 2020-08-06 | 深圳大学 | Dual-frequency light source |
| CN111180987A (en) * | 2020-01-09 | 2020-05-19 | 天津大学 | Orthogonal polarization dual-wavelength laser with adjustable power proportion |
| CN111180987B (en) * | 2020-01-09 | 2021-11-12 | 天津大学 | Orthogonal polarization dual-wavelength laser with adjustable power proportion |
| CN112421363B (en) * | 2020-11-17 | 2021-09-24 | 长春理工大学 | Based on Nd, MgO, LiNbO3Cross-polarization dual-wavelength free regulation switching laser of crystal |
| CN112421363A (en) * | 2020-11-17 | 2021-02-26 | 长春理工大学 | Based on Nd, MgO, LiNbO3Cross-polarization dual-wavelength free regulation switching laser of crystal |
| WO2022166102A1 (en) * | 2021-02-02 | 2022-08-11 | 长春理工大学 | Servo matching control mid-infrared differential dual-wavelength laser based on multi-period nd:mgo:ppln |
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