CN103762490A - Laser resonant cavity method for improving optical beam quality through thermal lenses - Google Patents
Laser resonant cavity method for improving optical beam quality through thermal lenses Download PDFInfo
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- CN103762490A CN103762490A CN201410018816.7A CN201410018816A CN103762490A CN 103762490 A CN103762490 A CN 103762490A CN 201410018816 A CN201410018816 A CN 201410018816A CN 103762490 A CN103762490 A CN 103762490A
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Abstract
The invention relates to a laser resonant cavity method for improving the optical beam quality through thermal lenses. A resonant cavity composed of a plane total-reflection mirror and a concave mirror with the transmissivity being 20 percent is adopted in the method. The plane total-reflection mirror carries out total reflection on the light with the wavelength being 1064 nm, and multiple stages of Nd:YAG crystal bars are arranged in the resonant cavity. The method is characterized in that after the pump light output by a pumping source irradiates the Nd:YAG crystal bars through the adjustment on the doping concentration of Nd:YAG in the crystal bars or the control on the output power of the pumping source, the thermal lenses with the similar optical parameters are formed in the multiple stages of Nd:YAG crystal bars, the pump light output by the pumping source is converged on the edges of crystals or outside the crystals to form a waist, the positions of waist spots formed by the thermal lenses are symmetrical, the front thermal lens and the back thermal lens shares a focal plane, the thermal lens of the last crystal and the concave mirror shares a focal plane, the pumping area and the laser low-order modular area can overlap, a non-doped glass bar is placed between two doped crystals for adjusting the distance between the thermal lenses, and therefore the control effect of the pump light can be guaranteed.
Description
Technical field
The invention belongs to laser technology field, relate to a kind of diode pumping solid laser resonator device, particularly a kind of method of utilizing thermal lens to improve the laserresonator of beam quality.
Technical background
In solid state laser, make pump light and oscillation light low-order mode coupling, require pump light radius little, but in reality, there is certain angle of divergence in pump light, with the propagation of light beam, in laser crystal, spot radius can increase very soon, if do not controlled, a large amount of pump energies will consume the region beyond low-order mode, not only seriously reduces efficiency of laser, also can affect due to increasing of high-rder mode composition the beam quality of laser, for this reason, we are used to thermal lens in crystal, design applicable thermal lens control hot spot.
Crystal is in the absorptive pumping light time, the energy difference of the absorption of crystal of variable concentrations, we are controlled crystal doping concentration, allow it form the suitable thermal lens of focal length, allow pump light and oscillation light low-order mode mate, the benefit of doing is like this: pump light region and laser low-order mode area coincidence, suppress the generation of high-rder mode in laser crystal, improve the efficiency of laser, improve the beam quality of laser simultaneously.
Summary of the invention
The object of this invention is to provide a kind of laserresonator that utilizes thermal lens to improve beam quality, realize pumped region and laser low-order mode region overlapping coupling, under certain power, by quantitative calculating and measuring to variable concentrations crystal thermal focal length, and through acousto-optic Q modulation, export high-power, high-quality laser.
The object of the present invention is achieved like this, a kind of method of utilizing thermal lens to improve the laserresonator of beam quality, comprise: the resonant cavity that the concave mirror of plane total reflective mirror and transmissivity 20% forms, plane total reflective mirror is to the total reflection of 1064nm wavelength light, in resonant cavity, there is multistage Nd:YAG crystal bar, it is characterized in that: by regulating Nd:YAG to mix concentration or the output power to pumping source in crystal bar, the pump light of pumping source output is radiated at after Nd:YAG crystal bar, the inner close thermal lens of optical parametric that forms of every one-level Nd:YAG crystal bar, the pump light of pumping source output pools waist outward in crystal edge or crystal, and the waist spot position symmetry that all thermal lenss form, the confocal plane of thermal lens wherein, the confocal plane of the thermal lens of last crystal and concave mirror, realize pumped region and laser low-order mode region overlapping, between two doped crystals, put into plain glass bar, be used for regulating the distance between thermal lens, to guarantee the control effect to pump light.
Described optical parametric is the focal length of thermal lens.
Described output power is by linear regulation control.
Acousto-optic Q-switch between described Nd:YAG crystal bar and the concave mirror of transmissivity 20%.
It is by perpendicular end surface pumping that the pump light of described pumping source output is radiated at Nd:YAG crystal bar.
It is side end face pumping that the pump light of described pumping source output is radiated at Nd:YAG crystal bar.
Feature of the present invention is, under the certain condition of pump power, the Crystallization thermal focal length difference of variable concentrations, we select suitable thermal focal length and crystal positions, make the confocal plane of thermal lens in every two sections of crystal, outgoing mirror is concave mirror, and with the confocal plane of final stage crystal, this has just realized pumped region and laser low-order mode region overlapping, has improved beam quality and the efficiency of laser.
Below in conjunction with embodiment, the present invention will be further described
Accompanying drawing explanation
Fig. 1 is the embodiment of the present invention 1 structural representation;
Fig. 2 is the embodiment of the present invention 2 structural representations;
Fig. 3 is the embodiment of the present invention 3 structural representations.
In figure: 1. pumping source; 2. plane total reflective mirror; 3. variable concentrations Nd:YAG crystal bar; 4. thermal lens; 5. the glass bar not mixing; 6. acoustooptic Q-switching; 7. the concave mirror of transmissivity 20%.
Embodiment
Embodiment 1
In above formula, f
nfor the thermal focal length of laser medium, k
cfor laser medium thermal conductivity, ω
pfor Gaussian beam radius,
for temperature variant refractive index variable quantity, η is crystal thermal conversion factor, p
0pumping light power, σ
21for the stimulated emission cross section of crystal, n
ifor the doping content of crystal, l
ifor laser crystal length.
As shown in Figure 1, a kind of method for designing of utilizing thermal lens to improve the laserresonator of beam quality, comprise: the resonant cavity that the concave mirror 7 of plane total reflective mirror 2 and transmissivity 20% forms, plane total reflective mirror 2 is to the total reflection of 1064nm wavelength light, in resonant cavity, there is multistage Nd:YAG crystal bar 3 to combine by bonding mode, in plane total reflective mirror 2 outsides, there is pumping source 1, pumping source 1 output optical axis overlaps, from formula (1), knowing every grade of doping content and laser crystal length that crystal is suitable, and in the situation of pump light power output and spot radius, we can obtain the thermal focal length that crystal is suitable by the method for numerical computations, by regulating the doping content of Nd:YAG in crystal bar, the pump light that pumping source 1 is exported is radiated at after Nd:YAG crystal bar, the inner formation of every one-level Nd:YAG crystal bar optical parametric is close, or the suitable thermal lens 4 of focal length, the Nd:YAG crystal of variable concentrations, the pump light difference absorbing, the thermal focal length forming is also different, we can adjust the focal length relation between every grade of crystal by the doping content that regulates crystal, or every grade of crystal length is carried out to suitable adjustment, meet the requirement of every grade of required focal length of crystal, after making pump light that pumping source 1 exports by thermal lens, in crystal edge, pool waist, and the waist spot position symmetry that makes all thermal lenss form, the wherein confocal plane of thermal lens between two, the confocal plane of the thermal lens of last crystal and concave mirror, realize pumped region and laser low-order mode region overlapping.
Acousto-optic Q-switch 6 between the concave mirror of Nd:YAG crystal bar and transmissivity 20%.
As shown in Figure 2, a kind of method for designing of utilizing thermal lens to improve the laserresonator of beam quality, comprise: the resonant cavity that the concave mirror 7 of plane total reflective mirror 2 and transmissivity 20% forms, plane total reflective mirror 2 is to the total reflection of 1064nm wavelength light, in resonant cavity, there is multistage Nd:YAG crystal bar 3, in plane total reflective mirror 2 outsides, there is pumping source 1, pumping source 1 output optical axis overlaps, from formula (1), knowing every grade of doping content and laser crystal length that crystal is suitable, and in the situation of pump light power output and spot radius, we can obtain the thermal focal length that crystal is suitable by the method for numerical computations, by regulating the doping content of Nd:YAG in crystal bar, the pump light that pumping source 1 is exported is radiated at after Nd:YAG crystal bar, the inner formation of every one-level Nd:YAG crystal bar optical parametric is close, or the suitable thermal lens 4 of focal length, the Nd:YAG crystal of variable concentrations, the pump light difference absorbing, the thermal focal length forming is also different, we can adjust the focal length relation between every grade of crystal by the doping content that regulates crystal, or the distance between every grade of crystal is carried out to suitable adjustment, meet the requirement of every grade of required focal length of crystal, between two doped crystals, put into plain glass bar 5, be used for regulating the distance between thermal lens, to guarantee the control effect to pump light, make the pump light that pumping source 1 is exported pool waist outward in crystal edge or crystal, and the waist spot position symmetry that all thermal lenss form, the wherein confocal plane of thermal lens between two, the confocal plane of the thermal lens of last crystal and concave mirror, realize pumped region and laser low-order mode region overlapping.
Acousto-optic Q-switch 6 between the concave mirror of Nd:YAG crystal bar and transmissivity 20%.
A kind of method for designing of utilizing thermal lens to improve the laserresonator of beam quality, comprise: the resonant cavity that the concave mirror 7 of plane total reflective mirror 2 and transmissivity 20% forms, plane total reflective mirror 2 is to the total reflection of 1064nm wavelength light, in resonant cavity, there is multistage Nd:YAG crystal bar 3, in each Nd:YAG crystal bar 3 one side, there is pumping source 1, from formula (1), knowing every grade of doping content and laser crystal length that crystal is suitable, and in the situation of pump light power output and spot radius, we can obtain the thermal focal length that crystal is suitable by the method for numerical computations, by regulating Nd:YAG mixing concentration or controlling pumping light power output in crystal bar, the pump light that pumping source 1 is exported is radiated at after Nd:YAG crystal bar, the inner formation of every one-level Nd:YAG crystal bar optical parametric is close, or the suitable thermal lens 4 of focal length, the Nd:YAG crystal of variable concentrations, the pump light difference absorbing, the thermal focal length forming is also different, we can adjust the focal length relation between every grade of crystal by the doping content that regulates crystal, or the distance between every grade of crystal is carried out to suitable adjustment, meet the requirement of every grade of required focal length of crystal, make oscillation light pool waist outward in crystal edge or crystal, and the waist spot position symmetry that all thermal lenss form, the wherein confocal plane of thermal lens between two, the confocal plane of the thermal lens of last crystal and concave mirror.
The parts that the present embodiment does not describe in detail and structure belong to well-known components and common structure or the conventional means of the industry, here not narration one by one.
Claims (6)
1. a method of utilizing thermal lens to improve the laserresonator of beam quality, comprise: the resonant cavity that the concave mirror (7) of plane total reflective mirror (2) and transmissivity 20% forms, plane total reflective mirror (2) is to the total reflection of 1064nm wavelength light, in resonant cavity, there is multistage Nd:YAG crystal bar (3), it is characterized in that: by regulating Nd:YAG to mix concentration or the output power to pumping source (1) in crystal bar, the pump light of pumping source (1) output is radiated at after Nd:YAG crystal bar, the inner close thermal lens (4) of optical parametric that forms of every one-level Nd:YAG crystal bar, the pump light of pumping source (1) output pools waist outward to crystal edge or crystal, and the waist spot position symmetry that all thermal lenss form, the confocal plane of thermal lens wherein, the confocal plane of the thermal lens of last crystal and concave mirror, realize pumped region and laser low-order mode region overlapping, between two doped crystals, put into plain glass bar (5), be used for regulating the distance between thermal lens, to guarantee the control effect to pump light.
2. a kind of method of utilizing thermal lens to improve the laserresonator of beam quality according to claim 1, is characterized in that: described optical parametric is the focal length of thermal lens (4).
3. a kind of method of utilizing thermal lens to improve the laserresonator of beam quality according to claim 1, is characterized in that: described output power is by linear regulation control.
4. a kind of method of utilizing thermal lens to improve the laserresonator of beam quality according to claim 1, is characterized in that: acousto-optic Q-switch (6) between described Nd:YAG crystal bar and the concave mirror of transmissivity 20%.
5. a kind of method of utilizing thermal lens to improve the laserresonator of beam quality according to claim 1, is characterized in that: it is by perpendicular end surface pumping that the pump light of described pumping source (1) output is radiated at Nd:YAG crystal bar.
6. a kind of method of utilizing thermal lens to improve the laserresonator of beam quality according to claim 1, is characterized in that: it is side end face pumping that the pump light of described pumping source (1) output is radiated at Nd:YAG crystal bar.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112436374A (en) * | 2020-10-29 | 2021-03-02 | 恒银金融科技股份有限公司 | Design method of Q-switched laser based on Nd/Cr-YAG bonded crystal |
| WO2023284776A1 (en) * | 2021-07-13 | 2023-01-19 | 黄衍介 | Laser pumping apparatus including geometric light concentrator and heat insulator, and laser pumping system |
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| US6282223B1 (en) * | 1999-08-11 | 2001-08-28 | Lumenis Inc. | Asymmetrical laser-resonator having solid-state gain-medium symmetrically filled by resonator-mode |
| US20030202554A1 (en) * | 2000-03-27 | 2003-10-30 | Takayuki Yanagisawa | Laser resonator |
| CN101179175A (en) * | 2007-11-30 | 2008-05-14 | 西安电子科技大学 | Laser diode pumped solid state laser with high peak power |
| CN102185237A (en) * | 2011-03-22 | 2011-09-14 | 中国电子科技集团公司第十一研究所 | High-power and 1,319 nm single-wavelength continuous laser device |
| CN101247019B (en) * | 2008-03-19 | 2011-12-28 | 福州高意通讯有限公司 | Semiconductor pump laser |
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2014
- 2014-01-16 CN CN201410018816.7A patent/CN103762490B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6282223B1 (en) * | 1999-08-11 | 2001-08-28 | Lumenis Inc. | Asymmetrical laser-resonator having solid-state gain-medium symmetrically filled by resonator-mode |
| US20030202554A1 (en) * | 2000-03-27 | 2003-10-30 | Takayuki Yanagisawa | Laser resonator |
| CN101179175A (en) * | 2007-11-30 | 2008-05-14 | 西安电子科技大学 | Laser diode pumped solid state laser with high peak power |
| CN101247019B (en) * | 2008-03-19 | 2011-12-28 | 福州高意通讯有限公司 | Semiconductor pump laser |
| CN102185237A (en) * | 2011-03-22 | 2011-09-14 | 中国电子科技集团公司第十一研究所 | High-power and 1,319 nm single-wavelength continuous laser device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112436374A (en) * | 2020-10-29 | 2021-03-02 | 恒银金融科技股份有限公司 | Design method of Q-switched laser based on Nd/Cr-YAG bonded crystal |
| WO2023284776A1 (en) * | 2021-07-13 | 2023-01-19 | 黄衍介 | Laser pumping apparatus including geometric light concentrator and heat insulator, and laser pumping system |
| US11929593B2 (en) | 2021-07-13 | 2024-03-12 | National Tsing Hua University | Laser pumping device and system including geometric light concentrator and thermal insulator |
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