液冷薄片构型激光器及其热管理技术
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摘要
为了解决增益介质的热效应问题,提出了一种浸没式构型液冷激光器方案,该构型激光器在10Hz重复抽运频率下,获得了615mJ的能量输出,光光转换效率为21%,斜率效率为23%.基于流体力学和热力学原理,建立了激光器增益区流场的热-流-固耦合模型,利用软件模拟和有限元分析法,研究了在不同流速、泵浦功率条件下,整个增益区的温度场、速度场的分布特性;并基于增益区温度场的分布,分析了液冷条件下通过增益区的激光波前畸变特性.结果表明,增益介质的最大光程差为0.7666λ,冷却液最大光程差为-4.7331λ,说明该构型激光器有着良好的热管理性能.
In order to solve the problem of the thermal effect of the laser gain media,a configuration named"immersed thin-disk oscillator"solid laser cooled directly with flow was proposed.Under the repeated pumping frequency of 10 Hz,a maximum output energy of 615 mJ was realized.The opticaloptical efficiency and the slope efficiency is 23% and 21% respectively.Based on the principle of fluid mechanics and thermodynamics,the thermal-flow-solid coupling model of lasing region was established.By using the software and the method of finite element analysis,the distribution characteristics of temperature field and velocity field were studied under the conditions of different flow rate and pump power.The wavefront aberration of the laser passing the gain region was simulated under the condition of liquid-cooled.The maximum optical path difference of the gain medium and coolant liquid are 0.7666λand-4.7331λrespectively.The results show that the laser has a good thermal management performance.
In order to solve the problem of the thermal effect of the laser gain media,a configuration named"immersed thin-disk oscillator"solid laser cooled directly with flow was proposed.Under the repeated pumping frequency of 10 Hz,a maximum output energy of 615 mJ was realized.The opticaloptical efficiency and the slope efficiency is 23% and 21% respectively.Based on the principle of fluid mechanics and thermodynamics,the thermal-flow-solid coupling model of lasing region was established.By using the software and the method of finite element analysis,the distribution characteristics of temperature field and velocity field were studied under the conditions of different flow rate and pump power.The wavefront aberration of the laser passing the gain region was simulated under the condition of liquid-cooled.The maximum optical path difference of the gain medium and coolant liquid are 0.7666λand-4.7331λrespectively.The results show that the laser has a good thermal management performance.
引文
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[3]REN Guo-guang.New tactical high energy liquid laser[J].Laser Technology,2006,30(4):418-421.任国光.新型战术高能液体激光器[J].激光技术,2006,30(4):418-421.
[4]ZHOU Shou-heng,ZHAO Hong,TANG Xiao-jun.High average power laser diode pumped solid-state laser[J].Chinese Laser,2009,36(7):1605-1618.周寿桓,赵鸿,唐小军.高平均功率全固态激光器[J].中国激光,2009,36(7):1605-1618.
[5]LEI Cheng-qiang,WANG Yue-feng,HUANG Feng,et al.Progress of high power solid-state laser pumping and coupling technology[J].Laser Technology,2011,35(6):725-733.雷呈强,汪岳峰,黄峰,等.高功率全固态激光器抽运耦合技术发展[J].激光技术,2011,35(6):725-733.
[6]SONG Qiong-ge,CHENG Guang-hua,BAI Jing,et al.System design and research of Yb:YAG thin disk laser with direct cooling arrangement[J].Acta Photonica Sinica,2014,10(43).宋琼阁,程光华,白晶,等.直接水冷的Yb:YAG薄片激光器系统设计与实验研究[J].光子学报,2014,10(43).
[7]Gizmag’s Email Newslecter,General Atomics USA[EB/OL].[2015-05-30].http://www.gizmag.com/lightweight-highenergy-liquid-laser-hellads-live-fire-tests/37742/.
[8]FU X,LI P L,LIU Q,et al.3KW liquid-cooled elasticallysupported Nd:YAG multi-slab CW laser resonator[J].Optics Express,2014,22(15):18421.10.
[9]NIE R Z,SHE J B,ZHAO P F,et al.Fully immersed liquid cooling thin-disk oscillator[J].Laser Physics Letters,2014,11(11):115808.
[10]LI P L,FU X,LIU Q,et al.Effects of turbulent flow field on wavefront aberration in liquid-convection-cooled disk laser oscillator[J].Applied Physics B:Laser and Optics,2015,119(2):371-380.
[11]WANG Ming-zhe.Research on new cooling technology for thermal management of high power solid-state lasers[D].Chang Sha:National University of Defense Technology,2011:12-13.王明哲.高功率固体激光器热管理新技术研究[D].长沙:国防科技大学,2011:12-13.
[12]PEI Zheng-ping,TANG Chun,TU Bo,et al.Simulation of thermal effect on beam distortion in Nd:YAG thin disk laser[J].High Power Laser and Particle Beams,2006,18(10):1615-1618.裴正平,唐淳,涂波,等.Nd:YAG薄片激光器热致波前畸变[J].强激光与粒子束,2006,18(10):1615-1618.
[13]DING Jian-yong,GUI Luo,PENG Bo,et al.Thermal analysis of the neodymium-doped microspheres array lasers[J].Laser Technology,2014,38(3):17-20.丁建永,桂珞,彭波,等.掺钕玻璃微球阵列激光器及其热管理研究[J].激光技术,2014,38(3):17-20.