CN103490278A - Method of distribution of absorption of laser crystal radial-direction non-uniform doping control pump light - Google Patents
Method of distribution of absorption of laser crystal radial-direction non-uniform doping control pump light Download PDFInfo
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- CN103490278A CN103490278A CN201310448723.3A CN201310448723A CN103490278A CN 103490278 A CN103490278 A CN 103490278A CN 201310448723 A CN201310448723 A CN 201310448723A CN 103490278 A CN103490278 A CN 103490278A
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Abstract
The invention relates to a method of distribution of absorption of laser crystal radial-direction non-uniform doping control pump light. The method is characterized in that after the pump light output by an optical fiber coupling laser diode optical fiber output end is gathered by a coupling system, the light field of the pump light is distributed in a Gaussian mode or flat Gaussian mode; a pump light anti-reflection film and an oscillating high-reflection film are plated on the pump end face of a radial-direction non-uniform doping crystal, an output mirror is a plane mirror, and the output mirror and the oscillating light high-reflection film on the pump end face of the crystal form a flat resonant cavity; in the working process, a thermal lens formed in the crystal can be simply equivalent to a thin lens on the pump end face of the radial-direction non-uniform doping crystal, and the resonant cavity becomes a stable cavity through the gather effect of the thermal lens; under the condition that a pump light distribution area and an oscillating light distribution area are determined, the spatial overlapping of the pump light distribution area and the oscillating light distribution area are achieved through the radial-direction non-uniform doping optimization design of the laser crystal. According to the method, ideal space coupling efficiency and ideal beam quality can be achieved.
Description
Technical field
The present invention relates to laser diode pump solid state laser device, particularly the laser crystal of the laser diode pump solid state laser device method that radially non-uniform doping control pumping light absorption distributes.
Background technology
Diode pumping solid laser has the advantages such as volume is little, lightweight, all solid state, has obtained paying close attention to widely.In recent years, the power output of diode pumping solid laser significantly promotes along with the increase of pumping source power.The use in high power pumping source, the most direct problem caused is exactly the crystal thermal effect problem.By the design focusing system, suitably increase the focal beam spot of pump light, can reduce pumping light power density, thereby weaken crystal thermal effect, but this is to realize by the capacity usage ratio of sacrifice basic mode, simultaneously, large pump light focal spot, mean large gain regions, a plurality of higher order modes may obtain vibration simultaneously and amplify, thereby beam quality sharply worsens, if take the method for inner chamber limit mould to suppress the higher order mode vibration, laser conversion efficiency will descend so.Visible, during high power pumping, thermal effect is serious, beam quality worsens, the degradation problems may occur simultaneously under conversion efficiency, and the performance of laser is produced to totally unfavorable impact.
In order to obtain high conversion efficiency, will improve spectrum coupling efficiency, the Space Coupling efficiency of laser, and efficiency of transmission of pump light, absorption efficiency etc.By controlling the working temperature of diode laser matrix, can realize pump light and the Spectral matching that radially the Uniform Doped absorption of crystal is composed, obtain maximum spectrum coupling efficiency.For the Space Coupling efficiency, the method extensively adopted is by the optimal design of coupled system and optical resonator, make the pump light in Uniform Doped crystal radially spatially highly overlap with oscillation light, many scholars have mentioned the overlap integral theory in research paper, for this kind of method provides theoretical, support.By to coupled system and resonant cavity completely reflecting mirror plated surface anti-reflection film, can reduce the reflection loss of pump light through the optical system interface, obtain higher pump light efficiency of transmission.For rear-earth-doped laser medium, select suitable size and doping content, can obtain desirable absorption efficiency.
In order to obtain high light beam quality, except utilizing unsteady cavity and space limit mould measure, preferred plan is exactly pump light to be converged to greatest extent to the basic mode vibration zone of laserresonator, realizes the space overlap of pump light and basic mode vibration light beam.Now, the spatial dimension of the light activated population transition of the pumping overwhelming majority in the basic mode oscillation light, although the vibration of this scope and some high-order transverse mode zone exists and partly overlaps, but the low threshold property due to basic mode, make it in the competition with other high-order transverse mode, have advantage, the energy overwhelming majority of upper energy level particle induced transition is converted to the basic mode Light Energy, thereby can obtain M
2approach 1 fundamental transverse mode light beam output.For the small-power pumping source, this kind of scheme is effective.For the high power pumping source, light field density increases sharply, and after pump light converges, strong thermal effect will become principal contradiction, affect the normal operation of laser, the catastrophic effect that even cause rete to come off, end face bursts.
Summary of the invention
The object of the invention is to provide a kind of laser crystal method that radially non-uniform doping control pumping light absorption distributes, so that in the situation that pump light field distribution resonant cavity structure is definite, the control of realization to gain profiles, the thermal effect of laser medium is controlled to a zone of reasonableness, and obtains desirable Space Coupling efficiency and beam quality.
The object of the present invention is achieved like this, laser crystal radially non-uniform doping is controlled the method that the pumping light absorption distributes, it is characterized in that: the pump light of fibre coupled laser diode fiber-optic output output through coupled system converge effect after, Gaussian Profile or flat-top Gaussian Profile for its optical field distribution; Anti-reflection and the high anti-duplicature of vibration of the pumping end surface of non-uniform doping crystal plating pump light radially, outgoing mirror is level crossing, the oscillation light high-reflecting film on outgoing mirror and crystal pumping end surface forms average resonant cavity; In the course of work, the thermal lens formed in crystal can simply be equivalent to the radially thin lens at non-uniform doping crystal pumping end surface place, and by the effect of converging of thermal lens, resonant cavity becomes stable cavity; Under the definite condition in pump light distributed areas and oscillation light distributed areas, the radially non-uniform doping optimal design by laser crystal, realize the space coincidence of pump light distributed areas and oscillation light distributed areas.
Described radially non-uniform doping crystal is ladder doped crystal radially, crystal axis central area Uniform Doped, and crystal axis central area is suitable with the oscillation light diameter, exterior annular zone non-impurity-doped; In the situation that pump light distributes is definite, by changing doping content and the doping scope of Doping crystal, realize the control for gain regions and Temperature Distribution; Doping content chooses 0.1% to 1%, and pump power is higher in principle, should select than the low doping concentration crystal, thereby can weaken the heat source strength at pumping end surface place, and the doping scope is suitable with Fundamental mode of cavity light beam transversal distribution.
Described radially non-uniform doping crystal is the radially doped crystal continuously of optimal design also, at pump light, distributes and determines in situation, by doping concentration distribution optimal design continuously radially, can realize the control that crystal gain distribution and thermal source are distributed.
Described doped crystal is rear-earth-doped solid laser medium Nd:YAG or Nd:YVO
4.
The result of calculation that the foundation of described radially non-uniform doping optimal design distributes for the crystal steady temperature, judgment criteria is to guarantee that gain centered, under the condition of Fundamental mode of cavity scope, makes the crystal radial temperature difference as far as possible little, weakening thermal lensing effect.
advantage of the present invention is:the present invention is specially adapted to miniaturization high power laser diode light-pumped solid state laser, easily obtain high conversion efficiency and high light beam quality, and without pump light being pooled to very little hot spot, thereby exempted the danger that even end face bursts that comes off of crystal end-face rete that the high power density pump light causes.
The accompanying drawing explanation
Below in conjunction with implementing accompanying drawing, the invention will be further described:
Fig. 1 is fibre coupled laser diode end-face pump solid laser schematic diagram;
Fig. 2 be radially the Uniform Doped crystal axis to absorption curve;
Fig. 3 is radially ladder doped crystal schematic diagram of fibre coupled laser diode end pumping;
Fig. 4 is the radially continuous doped crystal schematic diagram of fibre coupled laser diode end pumping.
In figure, 1, fibre coupled laser diode fiber-optic output, 2, coupled system, 3, crystal thermal lens, 4, the Uniform Doped crystal, 5, the resonant cavity outgoing mirror, 6, pump light distributed areas, 7, Fundamental mode of cavity oscillation light distributed areas, 8, ladder doped crystal radially, 9, doped crystal continuously radially; 10, pumping end surface.
embodiment:
Common diode end-face pump solid laser as shown in Figure 1, the pump light of fibre coupled laser diode fiber-optic output 1 output through coupled system 2 converge effect after, its optical field distribution 6 can be by Gaussian Profile or flat-top Gaussian Profile; Uniform Doped crystal 4 is pole type Uniform Doped crystal, and its pumping end surface 10 plating pump lights are anti-reflection and the high anti-duplicature of oscillation light; Outgoing mirror 5 is level crossing, outgoing mirror 5 forms average resonant cavity with the oscillation light high-reflecting film of the pumping end surface 10 of Uniform Doped crystal 4, and average resonant cavity is metastable resonators, has the large base module volume, be easy to the characteristics of regulating, the existence of crystal thermal lens can be converted into stable cavity; Near the crystal thermal lens 3 formed pumping end surface 10 in the course of work can be equivalent to the thin lens at Uniform Doped crystal 4 pumping end surface 10 places, by the effect of converging of thermal lens 3, but the resonant cavity steady operation; In order to obtain higher pump light conversion efficiency, need to utilize coupled system 2 that pump light is focused at crystal pumping end surface 10 places, pump light converges focal spot must be very little, is generally a hundreds of micron; The high density produced while converging due to pump light absorbs, and the thermal effect at pumping end surface 10 places is serious, and during high power pumping, thermal effect is serious, easily damages rete, and therefore, this kind of scheme is difficult to realize high light beam quality, high-power output.Fig. 2 has provided Uniform Doped crystal 4 and axial absorption curve, and during the visible ends face pumping, pump light is along the optical axis direction exponential damping.In order to improve the end face injecting power, can adopt the low doping concentration crystal, reduce the pump power density that pumping end surface 10 places absorb.Because the absorption coefficient of pump light is directly proportional to doping content, reduce the doping content of Uniform Doped crystal 4, absorption coefficient reduces, in order to guarantee that pump light absorbs fully, must increase crystal length, once and crystal bar length increases, when assembling, just more easily produce micro-curved, stress is serious, and laser-conversion efficiency is low.Coupled system 2 adopts traditional known technology, just is not described in detail here.
Pump light distributes and jointly determines that with Uniform Doped crystal doping concentration the absorption of laser medium distributes, and the pump energy part of absorption is converted into laser gain, and a part is converted into used heat, and gain distributes and determines by absorbing to distribute with thermal source.Therefore, in the situation that pump light distributes is definite, the radial variations by the optimal design doping content can obtain desirable gain profiles and thermal source distributes, and then reduces the crystal radial temperature difference, weakens thermal lensing effect, obtains large fundamental mode volume simultaneously.Like this, when high power pumping, even pump light does not just focus on pumping end surface 10, also can obtain high efficiency, high light beam quality.
Embodiment 1:
As shown in Figure 3, with the Uniform Doped crystal 4 that radially ladder doped crystal 8 replaces in Fig. 1, at pump light, distribute and determine in situation, by changing doping content and the doping scope of Doping crystal 8, realize the control for gain regions and Temperature Distribution.Now, pump light is without focusing at crystal end-face, the absorption of pump light in crystal distributes by the radially doping scope decision of ladder doped crystal 8, like this, the thermal lensing effect at crystal pumping end surface 10 places is weakened, the crystal end-face injecting power be can effectively improve, high power and high light beam quality are conducive to obtain.
Embodiment 2:
As shown in Figure 4, with the Uniform Doped crystal 4 that radially doped crystal 9 replaces in Fig. 1 continuously, distribute and determine under condition at pump light, by the radially optimization of doping concentration distribution continuously, as the parabolic distribution etc., can realize the distribute control of (being gain profiles) of absorption of crystal is reduced to the crystal radial temperature difference, suppress thermal effect, obtain the large base module volume.Focus near the crystal pumping end surface without pump light, just can realize gain regions and Fundamental mode of cavity distributed areas space coincidence, thereby the end face injecting power is improved greatly, guaranteed high light beam quality simultaneously.The crystal radially design optimization process of doping concentration distribution relates generally to crystal steady temperature field distribution calculating, and judgment criteria is to guarantee that gain centered, under the condition of Fundamental mode of cavity scope, makes the crystal radial temperature difference as far as possible little, weakening thermal lensing effect.
Claims (5)
- Laser crystal radially non-uniform doping control the method that the pumping light absorption distributes, it is characterized in that: the pump light of fibre coupled laser diode fiber-optic output (1) output through coupled system (2) converge effect after, Gaussian Profile or flat-top Gaussian Profile for its optical field distribution (6); Anti-reflection and the high anti-duplicature of vibration of the pumping end surface of non-uniform doping crystal (10) plating pump light radially, outgoing mirror (5) be level crossing, the oscillation light high-reflecting film on outgoing mirror (5) and crystal pumping end surface (10) forms average resonant cavity; In the course of work, the thermal lens formed in crystal (3) can simply be equivalent to the thin lens that radially non-uniform doping crystal pumping end surface (10) is located, and by the effect of converging of thermal lens (3), resonant cavity becomes stable cavity; In pump light distributed areas (6) and oscillation light distributed areas (7) under definite condition, by the radially non-uniform doping optimal design of laser crystal, realize the space coincidence of pump light distributed areas (6) and oscillation light distributed areas (7).
- Laser crystal according to claim 1 radially non-uniform doping control the method that the pumping light absorption distributes, it is characterized in that: described radially non-uniform doping crystal is ladder doped crystal (8) radially, crystal axis central area Uniform Doped, crystal axis central area is suitable with the oscillation light diameter, exterior annular zone non-impurity-doped; In the situation that pump light distributes is definite, by changing doping content and the doping scope of Doping crystal (8), realize the control for gain regions and Temperature Distribution; Doping content chooses 0.1% to 1%, and pump power is higher in principle, should select than the low doping concentration crystal, thereby can weaken the heat source strength at pumping end surface place, and the doping scope is suitable with Fundamental mode of cavity light beam transversal distribution.
- Laser crystal according to claim 1 radially non-uniform doping control the method that the pumping light absorption distributes, it is characterized in that: described radially non-uniform doping crystal is the radially doped crystal (9) continuously of optimal design also, distribute and determine in situation at pump light, by radially continuous doping concentration distribution optimal design, can realize the control to crystal gain distribution and thermal source distribution.
- Laser crystal according to claim 1 radially non-uniform doping control the method that the pumping light absorption distributes, it is characterized in that: described doped crystal is rear-earth-doped solid laser medium Nd:YAG or Nd:YVO 4.
- Laser crystal according to claim 1 radially non-uniform doping control the method that the pumping light absorption distributes, it is characterized in that: the result of calculation that the foundation of described radially non-uniform doping optimal design distributes for the crystal steady temperature, judgment criteria is to guarantee that gain centered is under the condition of Fundamental mode of cavity scope, make the crystal radial temperature difference as far as possible little, weaken thermal lensing effect.
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Cited By (6)
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| CN105870772A (en) * | 2016-06-16 | 2016-08-17 | 中国工程物理研究院激光聚变研究中心 | Laser gain chip, laser assembly, power amplifier and oscillator |
| CN106329301A (en) * | 2016-11-09 | 2017-01-11 | 上海卫星工程研究所 | Preparing method of solar-pumped laser-operating crystal with nanoscale-step doped structure |
| CN108400518A (en) * | 2018-04-04 | 2018-08-14 | 国科世纪激光技术（天津）有限公司 | Superpower laser unidirectionally pumps bidirectional couple structure |
| CN108663381A (en) * | 2018-05-09 | 2018-10-16 | 中国科学院长春光学精密机械与物理研究所 | One kind mixing iron laser crystal defect inspection method and device |
| CN110548991A (en) * | 2019-09-06 | 2019-12-10 | 深圳市大德激光技术有限公司 | Light field distribution control method and system for laser welding of precise structural part of power battery |
| CN112397977A (en) * | 2020-11-18 | 2021-02-23 | 中国科学院理化技术研究所 | Lath laser |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105870772A (en) * | 2016-06-16 | 2016-08-17 | 中国工程物理研究院激光聚变研究中心 | Laser gain chip, laser assembly, power amplifier and oscillator |
| CN105870772B (en) * | 2016-06-16 | 2018-11-23 | 中国工程物理研究院激光聚变研究中心 | A kind of laser gain chip and laser module, power amplifier and oscillator |
| CN106329301A (en) * | 2016-11-09 | 2017-01-11 | 上海卫星工程研究所 | Preparing method of solar-pumped laser-operating crystal with nanoscale-step doped structure |
| CN108400518A (en) * | 2018-04-04 | 2018-08-14 | 国科世纪激光技术（天津）有限公司 | Superpower laser unidirectionally pumps bidirectional couple structure |
| CN108663381A (en) * | 2018-05-09 | 2018-10-16 | 中国科学院长春光学精密机械与物理研究所 | One kind mixing iron laser crystal defect inspection method and device |
| CN110548991A (en) * | 2019-09-06 | 2019-12-10 | 深圳市大德激光技术有限公司 | Light field distribution control method and system for laser welding of precise structural part of power battery |
| CN112397977A (en) * | 2020-11-18 | 2021-02-23 | 中国科学院理化技术研究所 | Lath laser |
| CN112397977B (en) * | 2020-11-18 | 2022-03-04 | 中国科学院理化技术研究所 | Lath laser |
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