CsB3O5晶体高效三倍频产生28.3W 355nm激光  

28.3 W 355 nm laser generated by efficient third-harmonic in CsB_3O_5 crystal

作　　者：谢仕永[1,2] 鲁远甫[3] 张小富[1] 乐小云[1] 杨程亮[2] 王保山[4] 许祖彦[4] 

机构地区：[1]北京航空航天大学物理科学与核能工程学院,北京100191 [2]中国科学院长春光学精密机械与物理研究所,应用光学国家重点实验室,长春130033 [3]中国科学院深圳先进技术研究院,深圳518055 [4]中国科学院理化技术研究所,激光物理与技术研究中心,北京100190

出　　处：《物理学报》2016年第18期266-272,共7页Acta Physica Sinica

基　　金：应用光学国家重点实验室开放基金;国家自然科学基金(批准号:61205101);深圳市科技计划(批准号:GJHZ20140417-113430592,JCYJ20140417113130693,JCYJ20150925163313898)资助的课题~~

摘　　要：利用CsB_3O_5(CBO)晶体对Nd:YAG声光调Q准连续1064 nm激光的高效三倍频效应获得高功率355 nm激光输出.1064 nm激光采用大功率脉冲式半导体激光(LD)列阵侧面抽运Nd:YAG晶体的主振荡-功率放大(MOPA)系统实现210 W的调Q准连续输出,激光以1 kHz脉冲串方试运转,每个脉冲串包含5个调Q脉冲,单脉冲宽度为40 ns.经I类LiB_3O_5(LBO)晶体倍频产生98 W 532 nm绿光.通过30 mm长的II类CBO晶体对1064 nm与532 nm光和频获得28.3 W的355 nm紫外光,相应的三倍频转换效率为13.5%,比相同条件下II类LBO晶体高28.6%.研究了CBO三倍频产生355 nm光的温度敏感特性,得到其温度带宽为25?C,远大于LBO晶体的4?C.实验证明,CBO晶体在三倍频产生355 nm的转换效率和温度不敏感性方面均优于LBO晶体.Ultraviolet laser operating at 355 nm has been found to have wide applications in scientific and industrial fields of laser radar,biological fluorescence medicine,micro processing,laser marking and laser ablation,owing to its superior properties of short wavelength,high single-photon energy,and high resolution.In addition,355 nm laser plays a vital role in promoting the development of RGB full color display because it can be used as an excitation source for investigating the blue light emitting materials.LiB3O5（LBO） crystal possesses relatively high nonlinear coefficient and high optical damage threshold.Therefore,it is generally employed to generate 355 nm light through the third harmonic generation（THG） of the Nd：YAG laser（1064 nm）.However,the CsB3O5（CBO） crystal,which also belongs to B_3O_7 group has attracted more attention for its larger nonlinear coefficient.The temperature sensitivity is another important characteristic of the nonlinear crystal.Temperature fluctuation can cause the variation of refractive index of nonlinear optical crystal,which leads to phase mismatch and thus affects the nonlinear conversion efficiency.The principal refractive index of CBO crystal was accurately measured using the auto-collimation method in a temperature range from 40 to 190？C for the first time by Zhang et al.in 2013 [Zhang G C,et al.2013 Opt.Lett.38 1594],while the temperature bandwidth of CBO for 355 nm THG has not been reported.In the present paper,a high-power 355 nm laser is produced by efficient THG of an acousto-optic Q-switched quasicontinuous wave 1064 nm laser in CBO crystal.The master-oscillation power-amplification（MOPA） system with Nd：YAG crystal which is side pumped by high-power pulsed laser diode（LD） array delivers 210 W of a quasi-continuous Q-switched1064 nm laser power.The laser operates at a 1 kHz repetition rate,and each pulse train contains five Q-switched pulses each with a duration of 40 ns.The 98 W of 532 nm green light is produced by second-harmonic generated in ty

关 键 词：355 nm激光 CsB3O5晶体 三倍频 温度带宽 

分 类 号：TN24[电子电信—物理电子学]