CN103236639A - Self-injection structure for realizing isotropic medium output linearly polarized single-frequency laser - Google Patents
Self-injection structure for realizing isotropic medium output linearly polarized single-frequency laser Download PDFInfo
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Abstract
The invention provides a self-injection structure for realizing isotropic medium output linearly polarized single-frequency laser and relates to the self-injection structure of a laser, in particular to a Tm<3+>:YAG (yttrium aluminum garnet) laser which performs end-pumped single-frequency self-injection. 785nm light enters a crystal from an end surface; end pumping is performed; a single longitudinal mode is selected by combining an F-P etalon with a volume grating, wherein the volume grating serves as an output cavity lens; after the light enters a light splitter, the generated laser enters a 1/2 wave plate and a Glan prism to form linearly polarized light; and a small part of light is reflected by a full-reflecting lens through a partial through lens, so that the linearly polarized light is re-injected into the crystal to be continuously oscillated to form a structure of a self-injection linearly polarized single-frequency laser. Due to the design of the whole machine, linearly polarized output in an isotropic crystal is realized by a self-injection method, and the linearly polarized and stable single-frequency laser with high power is obtained. The method is complete and accurate, and is applied to injection frequency locking technology study of a single Tm-doped isotropic medium including Tm<3+>:YAG. The application field includes the fields of optoelectronic countermeasure, laser radar, laser medicine and the like.
Description
Technical field
The present invention relates to a kind of obtain linear polarization single-frequency laser output from injecting structure, especially relate to a kind of from injecting single-frequency Tm
3+: the structure of YAG laser is applicable to and injects the frequency locking Study on Technology that application comprises electrooptical countermeasures, laser radar, laser medicine etc.
Background technology
Mix 2 mu m waveband lasers of thulium laser generation because the particularity of its wavelength is widely used in fields such as electrooptical countermeasures, laser radar, laser medicine.At first, 2 mu m waveband lasers can be used as the pumping source that produces 3-5 μ m and 8-12 μ m infrared laser, can be used for the infrared directional jamming of laser, and this is for antagonism infrared Optoelectronic Countermeasure Technology of staring the infra-red missile of focus planardetector guidance of future generation.Directional jamming is that infrared interfering energy is focused in the narrow light beam, when infrared guided missile approaches, the light beam directive is attacked the infrared seeker of guided missile, adopt various interference programs and " fascination " to modulate to make to attack the missile homer work confusion can't lock onto target and miss the target.Secondly, because 2 mum wavelengths are little in the propagation in atmosphere loss, green vegetation and slowly drained soil etc. are big to its absorption, reflect little, and to eye-safe, thereby in laser acquisition, be very favourable with the differentiation of background on a surface target, therefore 2 mu m waveband lasers are outstanding light sources of laser radar, all are the research emphasis of present laser radar such as 2 mu m coherent Doppler anemometry radars, 2 μ m DIAL.Doppler anemometry laser radar can provide wind field data accurately for the global numerical weather forecast, and prevention and resisting nature disaster weather are carried out competitive sports smoothly, detects for the sky, airport provides accurate wind field; 2 μ m DIAL can realize CO in the local environment
2The real-time monitoring of the concentration of gas, aerosol, steam, ozone, temperature.At last, 2 μ m laser also have application very widely aspect laser medicine.The new type of continuous ripple is mixed thulium (Tm
3+) laser can export continuously, only produces very little mechanical damage as scalpel the time, and is also very little at biological tissue's damage field that incision causes, Tm
3+Laser only to front end less than the tissue effect in the 2mm scope; Surpass the tissue of this distance range or organ and will be subjected to the aqueous medium shielding and be protected, this will provide very big technical support to Minimally Invasive Surgery, wherein use 785nmLD pumping Tm
3+: YAG is exactly an efficient and simple method.
Inject the frequency locking technology and can obtain narrow pulsewidth, high power, high-octane fundamental transverse mode, single longitudinal mode laser output, this also be research coherent Doppler wind-observation radar the time an important technology.Injecting frequency locking has dual mode, and a kind of is the outer seed light of injecting, and another kind is from injecting seed light.Outer injection mode is by two laser constitutions, a seed laser and a power amplifier, but this mode has very high requirement to stability and the time synchronized of two lasers, be to utilize a laser constitution seeds chamber and power cavity from injection mode, therefore injection mode outside aspect stability and synchronism, being better than, this is an important innovations of the present invention and advantage, Chinese scholars mainly concentrates on outer injection mode to the research of seed injection technique, but carry out the Laser Study that seed laser injects from injection mode and also have a lot of blank using, therefore grasp more is conducive to inject the frequency locking Study on Technology from injection technique, and will be at this research field dominate.
For isotropic medium, the laser that produces after the pumping is circularly polarized light, draw power increases can produce the depolarization phenomenon, have a strong impact on output power of laser, re-inject in the resonant cavity by transferring circularly polarized light to linearly polarized light from injected system, having avoided producing this depolarization phenomenon, is an important innovations point of the present invention.
For frequency-selecting technology, F-P etalon technology and transmission-type body Bragg grating technology (T-VBG) are all quite ripe, utilize the F-P etalon light of different frequency to be had the characteristics of different transmitances, make the gain live width of the free spectral range that determined by the F-P etalon and laser medium suitable, the output of realization single longitudinal mode laser, and by being the output that reduces its commplementary wave length with T-VBG, make that injecting seed power in the outgoing mirror direction becomes big, be beneficial to the frequency locking of system, therefore use two F-P combination gratings can realize more high-power single-frequency laser output.
Summary of the invention
The objective of the invention is to design the output of a kind of generation 2 μ m linear polarization single-frequency lasers from injecting structure, when laser vibrates in resonant cavity, the 2 μ m laser that utilization produces self from injection technique are as seed laser, and change linearly polarized light into by polarizer, re-inject in the resonant cavity, utilize the mode competition of kind of submodule and natural norm, obtain monochromaticjty is better, spectral purity is higher high power, linear polarization, single-frequency laser output.
A kind of realize isotropic medium output line polarization single-frequency laser from injecting structure, utilize the continuous laser diode laser as pumping source, pumping Tm:YAG crystal, utilize two F-P etalons and a transmission-type body Bragg grating (T-VBG) as the frequency-selecting element, and use T-VBG as the output cavity mirror simultaneously, obtain single-frequency laser output; Adopt simultaneously from injected system, will export 2 μ m laser and refill the resonant cavity from the output cavity mirror, in injected system, constituted by spectroscope, 1/2 wave plate, Glan prism, total reflective mirror and partially reflecting mirror.
Described realization isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that adopting 785nm continuous laser diode as pumping source.
Described realization isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that adopting the Tm:YAG crystal, crystalline size is
3 * 7mm
3, doping content is 3.5%.
Described realization isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that adopting two P-F etalons as the frequency-selecting element, the thickness of one of them F-P etalon is 0.1mm, and adopts red quartz material; The thickness of another F-P etalon is 1mm, and adopts the YAG material.
Described realization isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that adopting transmission-type body Bragg grating (T-VBG), and as the output cavity mirror, this grating live width is less than 1nm, diffraction efficiency is greater than 99.5%, and seeing through centre wavelength is 2010nm.
Described realization isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that adopting 45 ° of spectroscopes, this spectroscope is coated with the 2010nm anti-reflection film, transmitance is 60%; The 785nm film (R＞99.5%) that is all-trans.
Described realization isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that from injected system its composition comprises that 1/2 wave plate, Glan prism, total reflective mirror and partially reflecting mirror constitute.
Described realization isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that adopting 1/2 wave plate.
Described realization isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that adopting Glan prism, it is of a size of 9 * 9 * 10mm
3, the prism angle of wedge is 40 °.
Described realization isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that adopting total reflective mirror, be coated with the 2010nm high-reflecting film.
Described realization isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that adopting 45 ° of partially reflecting mirrors, be coated with the anti-reflection film of 2010nm, transmitance is 80%.
At this in the injecting structure design process, the present invention at first adopts the F-P etalon technology frequency-selecting technology that combines with transmission-type body Bragg grating (T-VBG), compare with common frequency-selecting technology, owing to utilize T-VBG to replace the output cavity mirror, both can make the wavelength of laser generation avoid hydrone and CO
2The absworption peak of gas reduces the loss in the chamber, does not introduce new components and parts to resonant cavity again, improves the single-frequency power output so be beneficial to very much; Adopt simultaneously from injection technique, utilize 1/2 wave plate and Glan prism to make through the output light of partially reflecting mirror and the part laser that is back to resonant cavity through total reflective mirror and be linearly polarized light, and the part of returning resonant cavity will induce the laser of resonant cavity output to become linearly polarized light, avoided the depolarization phenomenon, and with do not carry out comparing when injecting, monochromaticjty is better, and spectral purity is higher.
Outstanding effect of the present invention will be in embodiment further instruction in addition.
Description of drawings
Fig. 1 for the present invention a kind of realize isotropic medium output line polarization single-frequency laser from injecting structure device schematic diagram.
Embodiment
Below in conjunction with accompanying drawing and instantiation the present invention is done and to illustrate in greater detail:
Laser device of the present invention comprises: centre wavelength is 785nm laser diode pumped source 1; The optical fiber 2 of coupling output 785nm laser; Coupled lens group 3; The Tm:YAG crystal 4; F-P etalon group 5; Transmission-type body Bragg grating (T-VBG) 6; 45 ° of spectroscopes 7; 1/2 wave plate 8; Glan prism 9; 45 ° of partially reflecting mirrors 10; Total reflective mirror 11.
It is as follows from injecting the single-frequency solid laser device device course of work that a kind of high power single of the present invention is mixed thulium: it is the 785nm laser diode that the LD pumping source adopts centre wavelength, and by optical fiber 2 couplings, the core diameter of optical fiber is 400 μ m, and numerical aperture is 0.22.Laser coupled set of lenses 3 collimates, and two condenser lenses are the plano-concave mirror, and two focal lengths of lens are 25mm, and bin is Ф 20mm, and thickness is 3mm, and coupling ratio is 1:1, incides Tm after Lens Coupling; YAG crystal 4 left side, left side are coated with 785nm high saturating, and to the high anti-film of 2010nm system, the spot center of 785nm pumping light is apart from left side 2mm, and Tm; YAG crystal 4 left side is as a chamber mirror of resonant cavity, laser is again by first F-P etalon, thickness is 0.1nm, for obtaining the output of 2010nm single longitudinal mode, by calculating F-P with 0.1mm with 6.25 ° of placements, and first F-P etalon of left number fixed, again through second F-P etalon, thickness is 1mm, and several second the F-P etalon to 1 in an adjusting left side ° this best angle for the output of acquisition 2010nm single longitudinal mode laser, again via transmission-type body grating (T-VBG) 6, and with transmission-type body grating (T-VBG) 6 as the output cavity mirror, make between crystal left side and grating and constitute resonant cavity, carry out laser generation, setting by transmissivity, make more 2010nm single-frequency laser export, wherein two F-P etalons are used in combination with transmission-type body grating (T-VBG) and can obtain more high-power laser output, the 2010nm laser of output and remaining 785nm pumping light are via 45 ° of spectroscopes 7, part transmission, another part is mapped to outside the chamber through 45 ° of mirror reversals, 45 ° of spectroscopes 7 adopt the level crossing structure, bin is Ф 20mm, thickness is 2mm, and be coated with 785nm high anti-, the film system that 2010nm is anti-reflection, by calculating gained, the transmitance of 7 pairs of 2010nm laser of 45 ° of spectroscopes is 80%.Because most of 785nm pumping light reflexes to outside the chamber, overwhelming majority 2010nm laser sees through, the 2010nm laser that sees through carries out the adjusting of pattern via 1/2 wave plate 8 again, obtains better pattern matching, is passing through Glan prism 9, the optical axis of Glan prism 9 is parallel with the plane of incidence, utilize in the Glan prism 9 o light different with the refractive index of e light, select 40 ° the prism angle of wedge by calculating, make the o light total reflection outside the chamber, e light is propagated in the chamber, obtains the 2010nm single-frequency laser of linear polarization.The 2010nm single-frequency laser of linear polarization is through 45 ° of partially reflecting mirrors 10 to the 2010nm reflection, a part reflexes on the total reflective mirror 11, again via total reflective mirror 11, and 45 ° of partially reflecting mirrors 10 return Glan prism 9, by 1/2 wave plate 8 and through 45 ° of spectroscopes 7, reenter in the resonant cavity that is constituted by Tm:YAG crystal 4 left side and transmission-type body grating (T-VBG) 6 again.Wherein 45 ° of partially reflecting mirrors 10 adopt the level crossing structure, bin is Ф 20mm, thickness is 2mm, the transmitance of 10 pairs of 2010nm laser of this 45 ° of partially reflecting mirrors is 90% by calculating as can be known, remaining 2010nm laser is by 45 ° of partially reflecting mirrors 10, be mapped on the total reflective mirror 11, wherein the 2010nm laser of 45 ° of partially reflecting mirror 10 reflections is minimum powers of realizing from injecting frequency locking in order to reach, make and induce enough formation linearly polarized lights, and see through 45 ° of spectroscopes 7 and re-inject in the resonant cavity, formed seed light from injected system, seed light is injected in the resonant cavity, carry out mode competition with the natural norm in the resonant cavity, induce to obtain more single-frequency, the 2010nm laser of linear polarization is because 2010nm linear polarization single-frequency laser increases in resonant cavity, increase mode competition, continue to induce to obtain more 2010nm linear polarization single-frequency laser output, continue this process, it is good to obtain monochromaticjty, the high power that spectral purity is higher, linear polarization, the output of single-frequency 2012nm laser.When not injecting seed laser, power output is 75mW, does not compare with injecting seed laser, and power obtains bigger raising, and obtains the linear polarization degree and be higher than 0.95, and beam quality is less than 1.2 single longitudinal mode output.
Not only can use the Tm:YAG crystal in this structure, isotropic mix all can use in the thulium laser this from injecting structure, export with the single-frequency laser that obtains high power, linear polarization, as the Tm:LuAG crystal, need the film system of and each eyeglass long according to the suitable change pumping optical wavelength of the character of crystal itself, chamber etc. simultaneously.
Owing to be a laser constitution seeds chamber and power cavity from injecting structure, so the pattern matching of natural norm and seed intermode the carrying out that will be more prone to than the structure of outer injection, when reaching enough injecting powers, can make that natural norm is better suppressed.And should can re-inject in the laser resonant cavity, thereby induce more linearly polarized light to produce from injecting structure by the linearly polarized laser output that wave plate combines with prism and obtains.Because what isotropic body produced is circularly polarized light, but because the draw power increase can cause the depolarization effect obvious, have a strong impact on the polarization stability of laser output, therefore adopt and from injecting structure linearly polarized light to be refilled, the generation of this phenomenon be will avoid, 2 μ m laser polarizations, single-frequency, stable output realized.This linearly polarized light is the outstanding feature of this patent from the structure that is injected into the chamber, better by the monochromaticjty of this 2 μ m laser from the injection mode acquisition in addition, spectral purity is higher.
Claims (12)
- One kind realize isotropic medium output line polarization single-frequency laser from injecting structure, namely utilize and singly mix thulium crystal pumping end face as the input cavity mirror, and adopt F-P etalon and body Bragg grating to carry out single longitudinal mode and select, wherein the body Bragg grating is as the output cavity mirror, in conjunction with 1/2 wave plate and Glan prism, making output laser is linearly polarized light, linearly polarized light reflects through total reflective mirror, thereby linearly polarized light is re-injected in the crystal, continue vibration, formed one from the structure of injecting single frequency laser.
- As claimed in claim 1 a kind of realize isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that being constituted by 1/2 wave plate, Glan prism, total reflective mirror and partially reflecting mirror from injected system.
- As claimed in claim 1 a kind of realize isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that adopting and singly mix thulium crystal pumping end face as the resonant cavity input mirror, crystal length scope 3-180mm, doping content scope 0.1%-8%.
- As claimed in claim 1 a kind of realize isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that adopting two P-F etalons as the frequency-selecting element, the thickness of one of them F-P etalon is 0.1mm, and adopts red quartz material; The thickness of another F-P etalon is 1mm, and adopts the YAG material.
- As claimed in claim 1 a kind of realize isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that adopting transmission-type body Bragg grating (T-VBG), and as the output cavity mirror, this grating live width is less than 1nm, diffraction efficiency is greater than 99.5%, and seeing through centre wavelength is 2010nm.
- As claimed in claim 1 a kind of realize isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that adopting two P-F etalons as the frequency-selecting element, the thickness of one of them F-P etalon is 0.1mm, and adopts red quartz material; The thickness of another F-P etalon is 1mm, and adopts the YAG material.
- As claimed in claim 1 a kind of realize isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that adopting 45 ° of spectroscopes, this spectroscope is coated with the 2010nm anti-reflection film, transmitance is 60%; The 785nm film (R＞99.5%) that is all-trans.
- As claimed in claim 2 a kind of realize isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that adopting Glan prism, it is of a size of 9 * 9 * 10mm 3, the prism angle of wedge is 40 °.
- As claimed in claim 2 a kind of realize isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that the total reflective mirror that adopts being coated with the 2010nm high-reflecting film.
- As claimed in claim 2 a kind of realize isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that 45 ° of partially reflecting mirrors adopting, be coated with the anti-reflection film of 2010nm, transmitance is 80%.
- 11. as claimed in claim 3 a kind of realize isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that the centre wavelength of the LD pumping source that adopts is the center absorbing wavelength of corresponding laser medium.
- 12. as claimed in claim 3 a kind of realize isotropic medium output line polarization single-frequency laser from injecting structure, it is characterized in that adopting Tm:YAG crystal pumping end face as the resonant cavity input mirror, crystalline size is3 * 7mm 3, doping content is 3.5%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109378689A (en) * | 2018-10-29 | 2019-02-22 | 北京理工大学 | A kind of method of the continuous single-frequency laser output of achievable super wideband and tunable |
| CN110932080A (en) * | 2019-05-09 | 2020-03-27 | 长春理工大学 | Single longitudinal mode laser |
| CN110954909A (en) * | 2018-09-27 | 2020-04-03 | 苏州溯光科技信息有限公司 | Linear frequency sweep coherent laser radar system |
| CN111458726A (en) * | 2020-04-19 | 2020-07-28 | 青岛镭测创芯科技有限公司 | Atmospheric aerosol analysis method based on coherent laser radar spectrum intensity data |
| CN114122879A (en) * | 2022-01-25 | 2022-03-01 | 中国工程物理研究院激光聚变研究中心 | Self-injection single longitudinal mode Q-switched laser |
-
2013
- 2013-04-25 CN CN 201310147029 patent/CN103236639A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110954909A (en) * | 2018-09-27 | 2020-04-03 | 苏州溯光科技信息有限公司 | Linear frequency sweep coherent laser radar system |
| CN109378689A (en) * | 2018-10-29 | 2019-02-22 | 北京理工大学 | A kind of method of the continuous single-frequency laser output of achievable super wideband and tunable |
| CN110932080A (en) * | 2019-05-09 | 2020-03-27 | 长春理工大学 | Single longitudinal mode laser |
| CN111458726A (en) * | 2020-04-19 | 2020-07-28 | 青岛镭测创芯科技有限公司 | Atmospheric aerosol analysis method based on coherent laser radar spectrum intensity data |
| CN111458726B (en) * | 2020-04-19 | 2023-03-07 | 青岛镭测创芯科技有限公司 | Atmospheric aerosol analysis method based on coherent laser radar spectrum intensity data |
| CN114122879A (en) * | 2022-01-25 | 2022-03-01 | 中国工程物理研究院激光聚变研究中心 | Self-injection single longitudinal mode Q-switched laser |
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Application publication date: 20130807 |