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采用激光二极管(LD)抽运、主动调Q的方式,利用c向切割的Nd∶GdVO4晶体的自受激拉曼散射(self-SRS)效应,实现了结构紧凑、高效的脉冲拉曼激光器。在输入功率为1.8W,主动调Q10kHz时,自受激拉曼激光器产生了稳定的1176nm的斯托克斯(Stokes)脉冲光,斯托克斯光的单脉冲能量为10μJ,脉冲宽度为19ns。此时,自受激拉曼散射的阈值仅为510mW,斯托克斯光的转换效率为5.6%。实验结果表明,有效的自受激拉曼变频可以通过一个c向切割的Nd∶GdVO4晶体,采用主动调Q的方式来实现。
A compact and efficient pulsed Raman laser is realized by self-SRS effect of c-direction cut Nd: GdVO4 crystal by laser diode (LD) pumping and active Q-switching. When the input power is 1.8W and Q10kHz is actively tuned, a stable 1176nm Stokes pulse light is generated from the stimulated Raman laser. The Stokes’ single pulse energy is 10μJ and the pulse width is 19ns . At this point, the threshold for stimulated Raman scattering is only 510 mW, and the conversion efficiency of Stokes light is 5.6%. Experimental results show that effective self-excited Raman frequency conversion can be realized by a Q-cut Nd: GdVO4 crystal.