885 nm直接抽运946 nm Nd∶YAG低温激光特性研究
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摘要
对低温下885nm抽运Nd∶YAG晶体946nm准三能级激光性能进行了研究。将激光上、下能级的玻尔兹曼分布分数f_1、f_2作为温度的函数引入到激光速率方程中,定性分析了低温下小信号增益和激光阈值的变化规律。利用搭建的低温冷却系统研究了不同晶体温度下946nm激光的输出性能,在210K时获得了最大165 mW的激光输出,斜效率为36%,相比于常温下斜效率提高了71%。观察并分析了低温下1061nm增益增强的现象,当温度低于190K时,1061nm激光增益显著提高,与946nm激光形成竞争,导致946nm激光输出降低。
The characteristics of cryogenically cooled 946 nm Nd∶YAG laser under 885 nm low quantum defect pumping are studied.The Boltzmann distribution fraction of the upper and lower laser levels as a function of temperature is introduced into the laser rate equation,and the change rule of small signal gain and laser threshold at low temperature is analyzed qualitatively.A cryogenic system is developed to study the output characteristics of the 946 nm laser at low temperature.A maximum 165 mW laser output with the slope efficiency 36% is achieved at 210 K.The slope efficiency is increased by 71% compared with the room temperature operation.The gain of 1061 nm laser enhanced at low temperature is observed and analyzed.When the temperature is lower than 190 K,the gain of 1061 nm laser significantly increases and 1061 nm laser competes with 946 nm laser,resulting in a decrease of 946 nm laser output.
The characteristics of cryogenically cooled 946 nm Nd∶YAG laser under 885 nm low quantum defect pumping are studied.The Boltzmann distribution fraction of the upper and lower laser levels as a function of temperature is introduced into the laser rate equation,and the change rule of small signal gain and laser threshold at low temperature is analyzed qualitatively.A cryogenic system is developed to study the output characteristics of the 946 nm laser at low temperature.A maximum 165 mW laser output with the slope efficiency 36% is achieved at 210 K.The slope efficiency is increased by 71% compared with the room temperature operation.The gain of 1061 nm laser enhanced at low temperature is observed and analyzed.When the temperature is lower than 190 K,the gain of 1061 nm laser significantly increases and 1061 nm laser competes with 946 nm laser,resulting in a decrease of 946 nm laser output.
引文
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[13]Yoon S J,Mackenzie J I.Cryogenically cooled946nm Nd∶YAG laser[J].Optics Express,2014,22(7):8069-8075.
[14]Cho C Y,Lee C Y,Chang C C,et al.24-W cryogenically cooled Nd∶YAG monolithic 946-nm laser with a slope efficiency>70%[J].Optics Express,2015,23(8):10136-10131.
[15]Du J X,Zhang F C,He J L.Theoretical analysis of the operation at 946nm of Nd∶YAG longitudinally pumped with diode laser[J].Chinese Journal of Quantum Electronics,2003,20(4):415-418.杜建新,张风传,何京良.二极管端面泵浦Nd∶YAG 946nm激光器理论分析[J].量子电子学报,2003,20(4):415-418.
[16]Risk W P.Modeling of longitudinally pumped solidstate lasers exhibiting reabsorption losses[J].Optical Society of America B,1988,5(7):1412-1423.
[2]Huang J,Hu X H,Chen W B.LD-pumped electrooptically Q-switched 946nm Nd∶YAG laser with pulse repetition rates of 1kHz[J].Chinese Journal of Lasers,2015,42(6):0602008.黄晶,胡秀寒,陈卫标.LD抽运1kHz电光调Q946nm Nd∶YAG激光器[J].中国激光,2015,42(6):0602008.
[3]Koechner W.Solid-state laser engineering[M].Sun W,Jiang Z W,Cheng G X,transl.Beijing:Science Press,2002:41.克希耐尔.固体激光工程[M].孙文,江泽文,程国祥,译.北京:科学出版社,2002:41.
[4]Lin Q,Wang X T,Zhu J Q.Mode matching of LD end-pumped 946-nm Nd∶YAG laser[J].Chinese Optics Letters,2007,5(s1):73-75.
[5]Fan T,Byer R.Modeling and CW operation of a quasi-three-level 946nm Nd∶YAG laser[J].IEEE Journal Quantum Electronics,1987,23(5):605-612.
[6]Zhou R,Li E,Li H,et al.Continuous-wave,15.2 W diode-end-pumped Nd∶YAG laser operating at 946nm[J].Optics Letters,2006,31(12):1869-1871.
[7]Shi Y X,Lu T L,Feng B H,et al.Thermal effects analysis of Nd∶CNGG 935 nm laser pumped by885nm and 808nm diode lasers[J].Chinese Journal of Lasers,2012,39(11):1102004.施玉显,卢铁林,冯宝华,等.885nm和808nm LD抽运Nd∶CNGG 935nm激光器热效应研究[J].中国激光,2012,39(11):1102004.
[8]Zong N,Zhang X F,Ma Q L,et al.Comparison of Nd∶YAG ceramic laser pumped at 885 nm and808nm[J].Chinese Physics Letters,2009,26(5):054211.
[9]Li F Q,Zong N,Wang Z C,et al.Passively modelocked grown-together composite YVO4/Nd∶YVO4crystal laser with a semiconductor saturable absorber mirror under 880-nm direct pumping[J].Chinese Optics Letters,2011,9(4):041405.
[10]Jiang X Y,Wang Z G,Zheng J G,et al.Experimental research of gain and thermal aberration properties of cryogenic Yb∶YAG laser amplifier[J].High Power Laser and Particle Beams,2014,26(11):111007.蒋新颖,王振国,郑建刚,等.低温Yb∶YAG放大器增益与热畸变特性实验研究[J]强激光与粒子束,2014,26(11):111007.
[11]Li X,Wang J F,Li X C,et al.Laser diode pumped cryogenic cooled Yb∶YAG regenerative amplifier[J].Chinese Journal of Lasers,2011,38(11):1102010.李响,王江峰,李学春,等.激光二极管抽运低温Yb∶YAG再生放大器[J].中国激光,2011,38(11):1102010.
[12]Wang J L,Zhang Z H,Cheng X J,et al.Study of diode-pumped Yb∶YAG disk lasers at low temperature[J].Chinese Optics Letters,2011,9(11):111403.
[13]Yoon S J,Mackenzie J I.Cryogenically cooled946nm Nd∶YAG laser[J].Optics Express,2014,22(7):8069-8075.
[14]Cho C Y,Lee C Y,Chang C C,et al.24-W cryogenically cooled Nd∶YAG monolithic 946-nm laser with a slope efficiency>70%[J].Optics Express,2015,23(8):10136-10131.
[15]Du J X,Zhang F C,He J L.Theoretical analysis of the operation at 946nm of Nd∶YAG longitudinally pumped with diode laser[J].Chinese Journal of Quantum Electronics,2003,20(4):415-418.杜建新,张风传,何京良.二极管端面泵浦Nd∶YAG 946nm激光器理论分析[J].量子电子学报,2003,20(4):415-418.
[16]Risk W P.Modeling of longitudinally pumped solidstate lasers exhibiting reabsorption losses[J].Optical Society of America B,1988,5(7):1412-1423.