高功率皮秒激光泵浦受激拉曼散射腔研究

为了获得高平均功率的皮秒宽谱段激光,同时 减小整个光学系统的体积,本文从理论和实验两方面研究了高功率皮秒激光泵浦受激拉曼 散射(SRS)振荡腔。 通过分析SRS过程中同时发生的物理过程,将高功率泵浦下的拉曼晶体内多种 非线性效应简化 为晶体在简单等效透镜下的SRS,并通过实验测量单通SRS光的发散角,计算得到了高 功率泵浦下的拉曼晶体等效透镜的曲率半径,在此基础上设计了稳定高效的SRS振荡腔,通 过对比实验验证了此拉曼振荡腔的高效性,实现了波段覆盖532～698nm、最高输出功率为1.32W的皮秒SRS同轴激光的输出。在相同波 段覆盖范围内,是已报道的最高平均输出功率。

Raman cavity design for high power picosecond pumped stimulated Raman scattering

In order to obtain high average power and wide spectrum picosecond laser,and al so to reduce the volume of the whole optical system,we study the high power picosecond pumped stimulated Raman scattering (SRS) oscillation cavity theoreticaly and experimentally in this paper.By analyzing th e accompanying processes of SRS,the various nonlinear effects in Raman crystal under high power pumped condition are simplified as SRS under the condition of simple equivalent thermal lens and through the exp erimental measurement divergence angle of single pass of SRS is obtained,from w hich the Raman crystal equivalent lens radius is calculated.On the basis of stable and efficient design theory of SRS oscillation cavity,the excellent performance of the cavity design is verified by the compar ing experiments.The high power picosecond pumped SRS system can produce the maxi mum power of 1.32W,covering 532nm to 698nm laser line,which is the highest av erage power of the picosecond Raman laser up to date.