【摘 要】
：
采用单纵模Nd:YAG二倍频激光泵浦,研究了CH4气体中的受激喇曼散射.实验发现,当激光的重复频率为2 Hz,1.1 MPa CH4中,泵浦能量为95 mJ时,后向一级斯托克斯(BS1)的量子转化效率
【基金项目】
：
国家重点基础研究发展计划(973计划)
论文部分内容阅读
采用单纵模Nd:YAG二倍频激光泵浦,研究了CH4气体中的受激喇曼散射.实验发现,当激光的重复频率为2 Hz,1.1 MPa CH4中,泵浦能量为95 mJ时,后向一级斯托克斯(BS1)的量子转化效率可达73%,并且由于激光脉冲的张弛振荡,BS1的脉宽被压窄到L2 ns,峰值功率达到了泵浦光功率的2.7倍,其光束质量大大优于泵浦光.在同样条件下,而重复频率为10 Hz时,BS1的量子转化效率降低为36%,但对光束质量影响不大,这是因为BS1呈现为与泵浦光波前翻转的复制光波,可以补偿热畸变.研究结果表明,如果设计一个CH4/He混合气体的带封闭循环冷却系统的高性能630 nm喇曼激光器,可能有其实际应用价值.
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