高效全固化紫外四倍频激光器的研究  

Experimental Study of All-Solid-State Second Harmonic and Fourth Harmonic Generation in Ti∶Sapphire Laser

作　　者：程光华[1] 于连君[1] 王屹山[1] 刘青[1] 赵卫[1] 陈国夫[1] 

机构地区：[1]中国科学院西安光机所瞬态光学技术国家重点实验室,西安710068

出　　处：《光学学报》2003年第3期330-334,共5页Acta Optica Sinica

基　　金：国家自然科学基金 (6 0 0 780 0 4 )资助课题

摘　　要：用半导体激光器抽运的调QYLF倍频激光器抽运掺钛蓝宝石激光器 ,用LBO晶体在腔内产生二次谐波 ,再聚焦到BBO晶体上产生四次谐波深紫外激光。为了提高谐波转换效率 ,在腔内分别插入了单片、组合双折射滤光片和聚焦透镜 ,在平均功率为 3.6W ,波长为 5 2 7nm的抽运光下得到 4 10mW ,4 17nm的蓝光。用长焦距的透镜聚焦二次谐波 ,得到 34mW ,2 0 8nm的紫外脉冲激光。从实验上详细研究了基频光的线宽对二次谐波效率的影响、二次谐波的线宽对四次谐波效率的影响、基频光的波长对四次谐波产生效率的影响。全面地分析了单片和组合双折射滤光片及抽运功率对钛宝石激光器基频光的脉宽、线宽等参量的影响。Second harmonic and fourth harmonic are generated by Ti∶sapphire laser pumped by a diode laser pumped Q switched, frequency doubled YLF laser at 527 nm. The nonlinear crystal LBO is used to generate the second harmonic in the Ti∶sapphire laser cavity at type I phase match with birefringent filter respectively, and BBO is used to generate ultraviolet laser at 208 nm. The maximum average power of 410 mW at 415 nm, and 34 mW at 208 nm are obtained at 1 kHz repetition rate when the pumping power is 3.6 W. The relations between linewidth of fundamental wave and harmonic efficiency, and wavelength of fundamental wave and fourth harmonic efficiency, the effects of birefringent filter on pulse width and line width of Ti∶sapphire laser, and the dependence of line width of Ti∶sapphire laser with birefringent filter on pumping power are investigated in theory and experiment. \{

关 键 词：钛宝石激光器 二次谐波产生 四次谐波产生 线宽 紫外激光 

分 类 号：TN248[电子电信—物理电子学]