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利用1064nm的Nd∶YAG激光抽运振荡腔内的硝酸钡晶体,获得高效率、窄脉冲的喇曼激光输出.硝酸钡晶体由水溶液降温法生长,长度为48mm.喇曼振荡腔由对抽运光、一阶、二阶斯托克斯光有不同反射率的双色平面镜构成.当抽运光功率达到4.5W时,获得最高的一阶斯托克斯喇曼激光功率为1.48W,相应的转换效率为32.9%,并测得斜率效率为40%.由于受激喇曼散射的作用,喇曼脉冲光由抽运脉冲光的19.8ns压缩为2.4ns,获得的喇曼激光脉冲波形具有的“上升沿陡峭、下降沿缓慢”的特性,对其形成过程作了定性分析.测得喇曼激光的波长为1198.5nm,半峰全宽(FWHM)为1.2nm.
High-efficiency, narrow-pulse Raman laser output was obtained by pumping Nd: YAG laser at 1064 nm into the chamber, and the length of the barium nitrate solution was 48 mm. The Raman oscillation chamber consisted of pumping Light, first-order, second-order Stokes light with different reflectivity of the two-color flat mirror composition.When the pumping power reaches 4.5W, the highest first-order Stokes Raman laser power of 1.48W, the corresponding The conversion efficiency is 32.9%, and the slope efficiency is measured at 40%. Due to the stimulated Raman scattering, the Raman pulse light is compressed by the 19.8 ns pumping pulse light to 2.4 ns, and the Raman laser pulse waveform obtained has “The rising edge is steep and the falling edge is slow”, and its formation process is qualitatively analyzed.The Raman laser has a wavelength of 1198.5 nm and a full width at half maximum (FWHM) of 1.2 nm.