Tm,Ho双掺调Q激光系统理论与实验研究

乔亮; 羊富贵; 武永华; 柯友刚; 夏忠朝

doi:10.7498/aps.63.214205

摘要

本文针对Tm,Ho双掺的激光系统,利用速率方程理论,得出了激光各能级的反转粒子数分布规律. 通过计算预测出了超过1 ms的时间有巨脉冲的光子输出,脉冲能量为88.4 mJ,脉冲宽度为426 ns. 实验采用环形腔声光调Q,Tm,Ho:LuLF为激光介质,三向侧面抽运. 自由运转和调Q状态的斜率效率分别为6.36%和2.9%. 注入能量3.25 J时,自由运转激光能量103.2 mJ,调Q激光能量为30.3 mJ,对应光-光效率为3.17%,0.93%;注入能量3.5 J时,自由运转激光能量为129.3 mJ,调Q激光能量35.9 mJ,对应光-光效率为3.69%,1.02%. 最大的动静比为32.8%. 激光脉冲宽度为417.2 ns. 如果环形腔能够单向运转,那么得到的激光能量和光-光转换效率都将增大一倍,与预测结果更加一致.

关键词:

Tm /
Ho:LuLF /
速率方程 /
能级 /
调Q激光

Abstract

The distribution of population inversion has been obtained by solving the rate equations of a Tm and Ho codoped laser system. A giant pulse laser output of 88.4 mJ with pulse duration of 426 ns has been predicted at 0.1% duty cycle of LD pump source. In a 2 m ring resonator, the Tm, Ho:LuLF laser material has been side-pumped from three directions and Q-switched for acoustic-optic device. The slope efficiency is 6.36% in free running mode and 2.9% in Q-switching mode. When 3.25 J pump energy in 1 Hz repetition frequency is injected, it has been demonstrated that the laser pulse energy of 103.2 mJ with an optical-to-optical efficiency of 3.17% in the free running mode and 30.3 mJ with 0.93% optical-to-optical efficiency. When 3.5 J pump energy is injected, it has been obtained that the pulse energies of 129.3 mJ and 35.9 mJ in the two modes with optical-to-optical efficiencies of 3.69% and 1.02% respectively. The greatest dynamic to static ratio is 32.8%. The pulse duration is 417.2 ns when 3.25J pump energy is injected. If the ring resonator operates unidirectionally, the laser energy and the corresponding optical efficiency will be doubled, the result being in agreement with the theoretical analysis of rate equations.

Keywords:

Tm /
Ho:LuLF /
rate equations /
energy transfer /
Q-laser

作者及机构信息

1.
福建江夏学院, 电子信息与光电技术研究中心, 福州 350108

基金项目: 福建省自然科学基金(批准号:2012J05109)、福建省教育厅科技项目(批准号:JA12333,JA12332,JK2012058)、福建江夏学院科研项目(批准号:2011C036)和福建省公共基础课实验教学平台项目(物理综合创新实验中心)资助的课题.

Authors and contacts

1.
Centre of Electronic Information and photoelectric technology, Fujian Jiangxia University, Fuzhou 350108, China

Funds: Project supported by the Natural Science Foundation of Fujian Province, China (Grant No. 2012J05109), the Science-Technology Foundation of the Education Department of Fujian Province, China (Grant Nos. JA12333, JA12332, JK2012058), the Scientific Research Program of Fujian Jiangxia University, China (Grant No.2011C036), and the Experimental Teaching Platform Program of Fundamental Course of Fujian Province (Physics Innovative Experimental Centre).

参考文献

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[8]	Louchev O A, Yoshiharu Urata, Satoshi Wada 2007 Opt. Exp. 15 3940
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施引文献

[1]	Walsh B M, Barnes N P, Singh U N 2008 Proceedings of SPIE 7153: 08-1-08-10
[2]	Mulugeta Petros, Jirong Yu, Songsheng Chen 2003 Proceedings of SPIE 4893: 203-210
[3]	Walsh B M, Barnes N P, Mulugeta Petros, Jirong Yu, Singh U N 2004 J. Appl. Phys. 95 3255
[4]	Zhang X L, Wang Y Z 2006 Acta Phys. Sin. 55 1160 (in Chinese) [张新陆, 王月珠 2006 55 1160]
[5]	Zhang X L, Wang Y Z, Shi H F 2006 Acta Phys. Sin. 55 1787 (in Chinese) [张新陆, 王月珠, 史洪峰 2006 55 1787]
[6]	Xia Z C, Yang F G, Qiao L 2013 Acta Phys. Sin. 62 114206 (in Chinese) [夏忠朝, 羊富贵, 乔亮 2013 62 114206]
[7]	Walsh B M, Barnes N P, Mulugeta Petros, Jirong Yua, Singh U N 2005 Proceedings of SPIE (SPIE, Bellingham, WA 2005) Lidar Remote Sensing for Industry and Environmental Monitoring V 2005, 5653:24-32
[8]	Louchev O A, Yoshiharu Urata, Satoshi Wada 2007 Opt. Exp. 15 3940
[9]	Gao J Y, Zhang Q L, Sun D L, Liu W P, Yang H J, Wang X F, Yin S T 2013 Acta Phys. Sin. 62 013102 (in Chinese) [高进云, 张庆礼, 孙敦陆, 刘文鹏, 杨华军, 王小飞, 殷绍唐 2013 62 013102]
[10]	Shu S J, Yu T, Liu R T, Hou J Y, Hou X, Chen W B 2011 COL 9 091407
[11]	Shu S J, Yu T, Zang H G, Liu D, Hou X, Chen W B 2011 Infrared and Laser Engineering 40 1442 (in Chinese) [舒仕江, 余婷, 臧华国, 刘丹, 侯霞, 陈卫标2011红外与激光工程40 1442]
[12]	Qiao L, Hou X, Chen W B 2009 Chinese Journal of Lasers 36 1327 (in Chinese) [乔亮, 侯霞, 陈卫标2009中国激光36 1327]
[13]	Qiao L, Hou X, Liu Y, Chen W B 2009 Laser Physics 19 1402
[14]	Wan S P 2004 Ph. D. Dissertation (Beijing: Tsinghua University) (in Chinese) [万顺平 2004 博士学位论文 (北京: 清华大学)]
[15]	Koechner W (translated by Sun W, Jiang Z W, Cheng G X) 2002 Solid-State Laser Engineering (Beijing: Science Press) pp18-22 (in Chinese) [W. 克希耐尔著(孙文, 江泽文, 程国祥译) 2002固体激光工程(北京: 科学出版社)第18–22页]

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