半导体双端抽运三程折叠谐振腔板条激光器
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摘要
为了获得简单紧凑的固体激光器,采用半导体端面抽运三程折叠谐振腔板条激光器,建立了热透镜等效腔模型,进行了等效腔稳定性及腔内基模光斑半径的仿真分析,将新型结构与平-平腔结构进行了比对性实验研究。结果表明,在三程折叠腔长为170mm时,获得了21W的1064nm激光功率输出,光光转换效率为16.4%,斜效率为25%,水平和竖直方向上的M~2因子分别为10.8和2.76。同等条件下,水平方向上M~2因子从平-平腔的152.7优化到三程折叠腔的10.8;输出光斑水平方向尺寸由平-平腔的10.8mm压缩到三程折叠腔的4.1mm,验证了结构简单紧凑的端面抽运三程折叠谐振腔激光器光束的输出能力。该研究对获得腔内调Q和腔内倍频532nm激光器有实际意义。
In order to obtain simple and compact solid-state lasers,a LD end-pumped slab laser with a folded three-pass resonator was used and its thermal lens equivalent cavity model was established. The equivalent cavity stability and cavity mode radius were simulated and analyzed. The new structure and flat cavity structure were studied comparatively based on experiments.The results show that,when the length of the folded three-pass cavity is 170 mm,the power output of 1064 nm laser is 21 W,lightlight efficiency is 16. 4%,slope efficiency is 25%,and M~2 factors in horizontal and vertical directions are 10. 8 and 2. 76 respectively. Under the same conditions,M~2 factor in horizontal direction is improved from 152. 7 of the parallel-plane resonator to 10. 8 of the folded three-pass cavity. The horizontal direction of output spot is compressed from 10. 8 mm of the parallel-flat cavity to 4. 1 mm of the folded three-pass cavity. Beam output capability of the simple and compact end-pumped laser with a folded three-pass resonator is verified. The study is of practical significance for obtaining intracavity Q-switched and intracavity frequency-doubled 532 nm lasers.
In order to obtain simple and compact solid-state lasers,a LD end-pumped slab laser with a folded three-pass resonator was used and its thermal lens equivalent cavity model was established. The equivalent cavity stability and cavity mode radius were simulated and analyzed. The new structure and flat cavity structure were studied comparatively based on experiments.The results show that,when the length of the folded three-pass cavity is 170 mm,the power output of 1064 nm laser is 21 W,lightlight efficiency is 16. 4%,slope efficiency is 25%,and M~2 factors in horizontal and vertical directions are 10. 8 and 2. 76 respectively. Under the same conditions,M~2 factor in horizontal direction is improved from 152. 7 of the parallel-plane resonator to 10. 8 of the folded three-pass cavity. The horizontal direction of output spot is compressed from 10. 8 mm of the parallel-flat cavity to 4. 1 mm of the folded three-pass cavity. Beam output capability of the simple and compact end-pumped laser with a folded three-pass resonator is verified. The study is of practical significance for obtaining intracavity Q-switched and intracavity frequency-doubled 532 nm lasers.
引文
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[22]LIU Z Y,WEI X,XIE X Zh,et al.Experimental study about micro texture on ceramic tool surface processed by UV laser[J].Laser Technology,2016,40(4):550-553(in Chinese).
[2]DU K M,WU N L,XU J D,et al.Partially end-pumped Nd∶YAG slab laser with a hybrid resonator[J].Optic Letters,1998,23(5):370-372.
[3]MAO Y F,ZHANG H L,XU L,et al.Research and development of200W high beam quality all-solid-state Nd∶YVO4slab laser[J].Transactions of Beijing Institute of Technology,2012,32(11):1162-1164(in Chinese).
[4]CHEN P F,DENG S P,ZHANG Z H,et al.Semiconductor double end pumped slab multipass folded cavity laser:China,201620355798.6[P].2016-09-14(in Chinese).
[5]XU L.LD-pumped innoslab laser oscillators and amplifiers[D].Beijing:Beijing Institute of Technology,2015:1-22(in Chinese).
[6]ZHANG L L,MENG J Q,HUANG Y,et al.Recent advances in high-power solid-state slab lasers[J].Laser&Optoelectronics Process,2005,42(4):33-36(in Chinese).
[7]JIA Ch Y,WANG Ch,LIU W F,et al.Cooling liquid for liquid immersed solid-state laser[J].Modern Chemical Industry,2015,35(10):95-97(in Chinese).
[8]SHAO N,ZHU X,ZHU G Z,et al.Study on jet array impingement cooling for crystal module of thin disk laser[J].Laser Technology,2016,40(5):695-698(in chinese).
[9]FENG Zh,WAN Y F.Thermal effect of LD end-pumped Nd∶GGG laser[J].Laser Technology,2014,38(3):360-362(in Chinese).
[10]WANG Ch Q,CHOW Y T,MENG X L,et al.Fluorescence spectra and laser characteristics of Nd∶YVO4crystal excited by the polarized emission from a laser diode[J].Chinese Journal of Lasers,1998,25(12):1129-1131(in Chinese).
[11]HOU J Y,WANG Y F.Research on stability of LD dual-endpumped folded resonator Nd∶YVO4master oscillator[J].Infrared,2009,30(1):36-40(in Chinese).
[12]LIU J H,LJ H,LU J R,et al.Mode matching in high-power laser-diode-array end-pumped Nd∶YVO4solid-state lasers[J].Acta Optica Sinica,2000,20(2):186-189(in Chinese).
[13]ZHENG J A,ZHAO Sh Z,WANG Q P,et al.Influence of thermal effect in gain-media on optimum design of LD-end pumped solid state laser[J].Acta Optica Sinica,2001,30(6):724-729(in Chinese).
[14]WANG D Sh,LI G,CHEN M,et al.Measurement of thermal focal length of LD-end-pumped crystal under stable-cavity-condition[J].Laser Technology,2003,27(6):534-537(in Chinese).
[15]ZOU J,ZHAO Sh Z,YANG K J,et al.Determining the thermal lens focus of LD end-pumped Nd∶Gd VO4solid-state laser with CCD detecting method[J].Laser Technology,2006,30(4):422-424(in Chinese).
[16]YU Zh Sh,LIU J,LIU J,et al.Study of the distributed thermal lens of LD end pumped rectangular gain[J].Optics Express,2013,21(20):23197-23205.
[17]YANG Y M,WEN J G,WANG Sh Y,et al.The thermal lens focus of the end-pumped Nd∶YAG laser[J].Acta Photonica Sinica,2005,34(12):1769-1772(in Chinese).
[18]LB D.Laser optics:laser beam propagation and beam quality control[M].Chengdu:Sichuan University Press,1992:168-188(in Chinese).
[19]LI L,TIAN F,ZHAO Z M,et al.LD end-pumped folded cavity Nd∶YVO4/LBO laser[J].Acta Photonica Sinica,2004,33(4):396-399(in Chinese).
[20]HE J L,WANG J M,HOU W,et al.LD pumped Nd∶YVO4/LBO intracavity frequency doubling over 1W green output laser[J].Acta Optica Sinica,1998,18(7):862-865(in Chinese).
[21]YANG Ch L,CAI B W,ZHANG R Zh.Output characteristics of diode-pumped,Q-switched Nd∶YVO4laser[J].Laser Technology,2001,25(6):473-476(in Chinese).
[22]LIU Z Y,WEI X,XIE X Zh,et al.Experimental study about micro texture on ceramic tool surface processed by UV laser[J].Laser Technology,2016,40(4):550-553(in Chinese).