CN205429410U - Thulium laser instrument is mixed in high peak power pulse - Google Patents
Thulium laser instrument is mixed in high peak power pulse Download PDFInfo
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- CN205429410U CN205429410U CN201520881598.XU CN201520881598U CN205429410U CN 205429410 U CN205429410 U CN 205429410U CN 201520881598 U CN201520881598 U CN 201520881598U CN 205429410 U CN205429410 U CN 205429410U
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Abstract
The utility model provides a thulium laser instrument is mixed in high peak power pulse, include: mix thulium optic fibre seed laser for thulium pulse seed laser is mixed in output, a optical fiber amplifier will mix thulium pulse seed laser and carry out power and amplify in advance to mix thulium laser output to frequency selector after enlargeing power in advance, the frequency selector will be received mixing the repetition rate reduction of thulium laser or selecting suitable repetition rate after power enlargies in advance, the 2nd optical fiber amplifier for carry out the thulium laser of mixing after the frequency -selecting once more power and enlarge in advance in order to satisfy the demand of mixing thulium solid amplifier, mix thulium solid amplifier for the thulium laser of mixing after power enlargies in advance once more carries out power amplification, and the thulium laser of mixing after will enlargeing is exported. The thulium laser instrument is mixed in high peak power pulse enlarged structure that has adopted optic fibre and solid to combine together carry out power amplification to mixing thulium laser to effectively improve 2 microns wave band pulses and mix thulium laser instrument peak power and average power.
Description
Technical field
This utility model belongs to the generation field of high power mid-infrared laser, particularly relates to high peak power pulse and mixes thulium laser.
Background technology
Mix Thulium lasers due to 2 micron wavebands and be in human eye safe waveband, near-infrared atmospheric window, water and special gas absorption bands, the numerous areas such as science and techniques of defence, biomedicine, atmospheric remote sensing, laser radar, polymer process for un-metal material, environmental Kuznets Curves and nearly mid-infrared scientific research can be widely used in.Additionally, due to the silica matrix material of thulium doped fiber easily realizes high power pulse output, can be as the good LASER Light Source of the non-linear research of mid-infrared.Again due to the many potential application in middle-infrared band so that 2 microns of thulium doped fibers and solid state laser become the focus of Recent study.
Mixing thulium laser for all-fiber pulse, although its mean power has reached hundreds of watts, but the core diameter of commercialization rare-earth doped optical fibre mostly is tens micron dimensions, general core diameter is 25 μm or 20 μm.When carrying out power amplification with it, stimulated Raman scattering (StimulatedRamanScattering is easily produced under high peak power, SRS), Self-phase modulation (Self-phaseModulation, the nonlinear effect such as SPM), especially stimulated Raman scattering makes laser instrument frequency domain bigger non-linear broadening occur, greatly have impact on the quality of optical fiber laser so that output peak power is less than 100 kilowatts more.Simultaneously, 2 microns of thulium-doped fiber lasers are due to the strong INFRARED ABSORPTION of silica fibre, make wavelength be greater than about the loss index after 2.2 microns to increase, thus the red shift of wavelength that SRS causes makes laser loss increase, lasting thermal accumlation will damage the device of laser system, simultaneously because nonlinear frequency conversion so that the laser output power of signal wave strong point is difficult to improve further.Additionally, the high-peak power also having the form of employing chirped pulse amplification (Chirped-pulseamplification, CPA) to realize thulium doped optical fiber laser exports, but the introducing of high accuracy grating, add the difficulty of system, practicality and cost undoubtedly.
Mixing thulium laser for existing solid, though the peak value output of hundreds of megawatt can be realized, but all use CPA technology, complicated space structure, high-precision grating add the difficulty of system undoubtedly and also limit its practicality simultaneously.In addition, though using the peak power adjusting Q solid structure to achieve megawatt magnitude, but pulsewidth is nanosecond, repetition rate extremely low (< 100Hz), mean power is only watt level, also limit 2 mum laser in aspect demands to high-average power such as ultrafast laser processing, nonlinear frequency transformations.
Utility model content
Technical problem to be solved in the utility model be to provide a kind of simple and compact for structure and can realize high-average power and high-peak power output pulse mix thulium laser.
This utility model is achieved in that a kind of high peak power pulse mixes thulium laser, including:
Thulium doped fiber seed laser, mixes thulium pulse seed laser for output；
First fiber amplifier, will mix thulium pulse seed laser and carry out power pre-amplification, and the Thulium lasers of mixing after power pre-amplification will be exported frequency selector；
Frequency selector, the repetition rate mixing Thulium lasers after the described power pre-amplification that will receive reduces or selects suitable repetition rate；
Second fiber amplifier, for again carrying out power pre-amplification to meet the demand mixing thulium solid amplifier by the Thulium lasers of mixing after frequency-selecting；
Mixing thulium solid amplifier, for the Thulium lasers of mixing after power pre-amplification again carried out power amplification, and the Thulium lasers of mixing after amplifying exports.
Further, described first fiber amplifier is single mode thulium doped fiber amplifier, and described single mode thulium doped fiber amplifier is for being amplified to a watt level by the seed laser of milliwatt level.
Further, described second fiber amplifier is large mode area thulium doped fiber amplifier, and described large mode area thulium doped fiber amplifier uses large mode area thulium doped fiber as gain media.
Further, described high peak power pulse is mixed thulium laser and is also included at least one optical fiber coupling isolator, before described optical fiber coupling isolator is placed in the first fiber amplifier and/or before described frequency selector, for isolating described first fiber amplifier and/or the return light of described second fiber amplifier.
Further, described mix thulium solid amplifier include the first collimation bonder, second collimation bonder, mix Thulium lasers crystal and semiconductor pumping sources, described first collimation bonder again will carry out power pre-amplification after mix Thulium lasers be coupled into described in mix Thulium lasers crystal；
Described semiconductor pumping sources is mixed Thulium lasers crystal for pumping and is obtained pumping laser；
Described second collimation bonder mixes Thulium lasers crystal described in being coupled into by described pumping laser；
Described mix the Thulium lasers of mixing after Thulium lasers crystal utilizes described pumping laser again will to carry out power pre-amplification and carry out power amplification.
Further, mix thulium solid amplifier described in and also include the first dichroic mirror, the second dichroic mirror and coupling output system；
Described first dichroic mirror is placed in described first collimation bonder and described mixes between Thulium lasers crystal, for signal laser is carried out antireflection, is totally reflected pumping laser；
Described second dichroic mirror is placed in described second collimation bonder and described mixes between Thulium lasers crystal, is incident upon described coupling output system for being all-trans signal laser, pumping laser is carried out antireflection simultaneously；
Described coupling output system is placed in below described second dichroic mirror, and the signal laser after amplifying carries out Space Collimation output.
Further, described coupling output system includes fiber coupler, and the signal laser focusing after collimation is coupled into described fiber coupler and carries out optical fiber coupling output.
Further, described thulium doped fiber seed laser is for adjusting Q nanosecond seed laser or locked mode psec seed laser.
Further, described frequency selector is made up of acousto-optic modulator and signal function generator.
This utility model is compared with prior art, have the beneficial effects that: high peak power pulse of the present utility model mixes thulium laser compared with tradition thulium doped fiber amplifier, the high gain characteristics of first, second fiber amplifier when both having combined pre-amplification, the high non-linearity threshold value of thulium solid amplifier is mixed when combining again power amplification, make its non-linear threshold can improve 4 orders of magnitude, and then megawatt magnitude high peak power pulse can be realized mix the output of Thulium lasers.Use stable all-fiber seed laser simultaneously, in conjunction with all-fiber power pre-amplification, add the compactedness of system.Additionally, the repetition rate of seed laser is reduced by frequency selector, can make to export peak power higher, the repetition rate of laser can also be controlled simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation that this utility model high peak power pulse mixes thulium laser.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, this utility model is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain this utility model, is not used to limit this utility model.
High peak power pulse of the present utility model is mixed thulium laser and is used the structure of optical fiber and solid phase Hybrid amplifier that pulse is mixed Thulium lasers to carry out power amplification, use frequency selector to reduce the repetition rate mixing Thulium lasers simultaneously, thus be effectively improved 2 micron waveband pulses and mix peak power and the mean power of thulium laser.
As it is shown in figure 1, be this utility model one preferably embodiment, a kind of high peak power pulse mixes thulium laser, including thulium doped fiber seed laser the 10, first fiber amplifier 12, frequency selector the 13, second fiber amplifier 14 with mix thulium solid amplifier 15.Thulium doped fiber seed laser 10 for outputting high quality, stablize and compact mix thulium pulse seed laser.Owing to the output of seed laser is relatively low, need it is carried out power pre-amplification to meet the frequency selector 13 demand to power, first fiber amplifier 12 can carry out power pre-amplification by mixing thulium pulse seed laser, and the Thulium lasers of mixing after power pre-amplification is exported frequency selector 13.The repetition rate mixing Thulium lasers after the power pre-amplification that frequency selector 13 will receive reduces or selects suitable repetition rate, and frequency-selecting scope typically can carry out frequency-selecting from Hz to MHz so that under equal mean power, it is achieved higher peak power exports.Second fiber amplifier 14 is for again carrying out power pre-amplification to meet the demand mixing thulium solid amplifier 15 by the Thulium lasers of mixing after frequency-selecting.Outfan 141 optical fiber of the input and the second fiber amplifier 14 of mixing thulium solid amplifier 15 connects, for the Thulium lasers of mixing after power pre-amplification again is carried out power amplification, the non-linear threshold of raising system, being finally reached the effect of high-peak power output, mean power can also reach tens watts simultaneously.Compared with the core diameter of optical fiber in large mode area thulium doped fiber amplifier, mix Thulium lasers crystal and can be selected for Tm:YAG, Tm:YAP, Tm:YLF, Tm/Ho:YLF, Tm/Ho:YAG etc., compared with optical fiber, the beam diameter mixing Thulium lasers crystal is estimated to improve 1 order of magnitude, optical power density can reduce by 2 orders of magnitude, correspondingly so that non-linear threshold improves 2 orders of magnitude.In addition, shorter laser crystal is compared with longer Active Optical Fiber, and the effective length that laser pulse functions can reduce by 2 orders of magnitude, so that non-linear threshold improves further, finally peak power can be promoted to Megawatt level, avoid the application of complicated CPA technology simultaneously.
First fiber amplifier 12 is single mode thulium doped fiber amplifier, and single mode thulium doped fiber amplifier is for being amplified to a watt level by the seed laser of milliwatt level.Second fiber amplifier 14 is large mode area thulium doped fiber amplifier, large mode area thulium doped fiber amplifier uses large mode area thulium doped fiber as gain media, use the mode of cladding pumping, pump light transmits at inner cladding, flashlight transmits at fibre core, pump light repeatedly through fibre core, is absorbed by thulium ion in transmitting procedure, and then will be amplified with the laser of seed laser consistent wavelength.The fibre core of large mode area thulium doped fiber/cladding diameter size can select 25/250 μm or the optical fiber of 20/400 μm, and the power that can promote when selecting the optical fiber of 400 μm can be some higher.The use of large-mode-area fiber, primarily to promote the threshold value of nonlinear effect, suppresses the generation of bad nonlinear effect.
High peak power pulse is mixed thulium laser and is also included at least one optical fiber coupling isolator 11, before optical fiber coupling isolator 11 is placed in the first fiber amplifier 12 and/or before frequency selector 13, for isolating the first fiber amplifier 12 and/or return light of the second fiber amplifier 14, to prevent from previous stage system is caused damage.
Mix thulium solid amplifier 15 and include that the first collimation bonder 151, second collimates bonder 153, mixes Thulium lasers crystal 152, semiconductor pumping sources the 154, first dichroic mirror the 155, second dichroic mirror 156 and coupling output system 157.Thulium lasers of mixing after first collimation bonder 151 will carry out power pre-amplification again is coupled into and mixes Thulium lasers crystal 152.Semiconductor pumping sources 154 is mixed Thulium lasers crystal for pumping and is obtained pumping laser, to realize power amplification.Pumping laser is coupled into by the second collimation bonder 153 mixes Thulium lasers crystal 152.Mix Thulium lasers crystal 152 for utilizing pumping laser that the Thulium lasers of mixing after again carrying out power pre-amplification is carried out power amplification.First dichroic mirror 155 is placed in the first collimation bonder 151 and mixes between Thulium lasers crystal 152, for signal laser is carried out antireflection, is totally reflected pumping laser.Second dichroic mirror 156 is placed in the second collimation bonder 153 and mixes between Thulium lasers crystal 152, is incident upon coupling output system 157 for being all-trans the signal laser after amplifying, pumping laser is carried out antireflection simultaneously.In the present embodiment, the second dichroic mirror 156 is placed to the 45 degree of angles of lopsidedness mixing Thulium lasers crystal 152.
Coupling output system 157 is placed in below the second dichroic mirror 156, and the signal laser after amplifying carries out Space Collimation output.Coupling output system 157 includes fiber coupler, and the signal laser focusing after collimation is coupled into described fiber coupler and carries out optical fiber coupling output.Due to the emission spectra that thulium ion is wider, native system can realize the laser output between spectral region 1700nm 2100nm.
Thulium doped fiber seed laser 10 is used for the power amplification of rear class as seed source, can be to adjust Q nanosecond seed laser or locked mode psec seed laser.
High peak power pulse described in the utility model is mixed thulium laser and is used the seed laser of all-fiber, improve quality and the stability of seed laser, mixing all optical fibre structure before thulium solid amplifier makes overall structure compacter, add practicality, avoid the use of expensive grating pair, reduce cost.In addition, the mode that optical fiber and solid structure combine, while ensureing seed laser quality, the form that power-amplifier stage uses solid to amplify improves the non-linear threshold of system, avoid the generation of the nonlinear effect that the relatively low non-linear threshold of fiber amplifier causes, such that it is able to realize a megawatt magnitude high-peak power output and simple and compact for structure, with the amplification of other raising peak powers mentioned in the world, laser instrument of the present utility model need not the chirped pulse amplification of complexity.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all any amendment, equivalent and improvement etc. made within spirit of the present utility model and principle, within should be included in protection domain of the present utility model.
Claims (9)
1. a high peak power pulse mixes thulium laser, it is characterised in that including:
Thulium doped fiber seed laser, mixes thulium pulse seed laser for output；
First fiber amplifier, will mix thulium pulse seed laser and carry out power pre-amplification, and the Thulium lasers of mixing after power pre-amplification will be exported frequency selector；
Frequency selector, the repetition rate mixing Thulium lasers after the described power pre-amplification that will receive reduces or selects suitable repetition rate；
Second fiber amplifier, for again carrying out power pre-amplification to meet the demand mixing thulium solid amplifier by the Thulium lasers of mixing after frequency-selecting；
Mixing thulium solid amplifier, for the Thulium lasers of mixing after power pre-amplification again carried out power amplification, and the Thulium lasers of mixing after amplifying exports.
High peak power pulse the most according to claim 1 mixes thulium laser, it is characterised in that described first fiber amplifier is single mode thulium doped fiber amplifier, and described single mode thulium doped fiber amplifier is for being amplified to a watt level by the seed laser of milliwatt level.
High peak power pulse the most according to claim 1 and 2 mixes thulium laser, it is characterized in that, described second fiber amplifier is large mode area thulium doped fiber amplifier, and described large mode area thulium doped fiber amplifier uses large mode area thulium doped fiber as gain media.
High peak power pulse the most according to claim 1 mixes thulium laser, it is characterized in that, described high peak power pulse is mixed thulium laser and is also included at least one optical fiber coupling isolator, before described optical fiber coupling isolator is placed in the first fiber amplifier and/or before described frequency selector, for isolating described first fiber amplifier and/or the return light of described second fiber amplifier.
5. mix thulium laser according to the high peak power pulse described in claim 1 or 4, it is characterized in that, described mix thulium solid amplifier include the first collimation bonder, second collimation bonder, mix Thulium lasers crystal and semiconductor pumping sources, described first collimation bonder again will carry out power pre-amplification after mix Thulium lasers be coupled into described in mix Thulium lasers crystal；
Described semiconductor pumping sources is mixed Thulium lasers crystal for pumping and is obtained pumping laser；
Described second collimation bonder mixes Thulium lasers crystal described in being coupled into by described pumping laser；
Described mix the Thulium lasers of mixing after Thulium lasers crystal utilizes described pumping laser again will to carry out power pre-amplification and carry out power amplification.
High peak power pulse the most according to claim 5 mixes thulium laser, it is characterised in that described in mix thulium solid amplifier also include the first dichroic mirror, the second dichroic mirror and coupling output system；
Described first dichroic mirror is placed in described first collimation bonder and described mixes between Thulium lasers crystal, for signal laser is carried out antireflection, is totally reflected pumping laser；
Described second dichroic mirror is placed in described second collimation bonder and described mixes between Thulium lasers crystal, is incident upon described coupling output system for being all-trans signal laser, pumping laser is carried out antireflection simultaneously；
Described coupling output system is placed in below described second dichroic mirror, and the signal laser after amplifying carries out Space Collimation output.
High peak power pulse the most according to claim 6 mixes thulium laser, it is characterised in that described coupling output system includes fiber coupler, and the signal laser focusing after collimation is coupled into described fiber coupler and carries out optical fiber coupling output.
High peak power pulse the most according to claim 1 mixes thulium laser, it is characterised in that described thulium doped fiber seed laser is for adjusting Q nanosecond seed laser or locked mode psec seed laser.
High peak power pulse the most according to claim 1 mixes thulium laser, it is characterised in that described frequency selector is made up of acousto-optic modulator and signal function generator.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105337146A (en) * | 2015-11-06 | 2016-02-17 | 深圳大学 | High-peak power pulse thulium-doped laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337146A (en) * | 2015-11-06 | 2016-02-17 | 深圳大学 | High-peak power pulse thulium-doped laser |
| CN105337146B (en) * | 2015-11-06 | 2019-03-15 | 深圳大学 | A kind of high peak power pulse mixes thulium laser |
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