Granados Eduardo, Spence David J, Mildren Richard P
MQ Photonics Research Centre, Macquarie University, Sydney, NSW 2109, Australia.
Opt Express. 2011 May 23;19(11):10857-63. doi: 10.1364/OE.19.010857.
We present a synchronously pumped diamond Raman laser operating at 275.7 nm pumped by the 4th harmonic of a mode locked Nd:YVO4 laser. The laser had a threshold pump pulse energy of 5.8 nJ and generated up to 0.96 nJ pulses at 10.3% conversion efficiency. The results agree well with a numerical model that includes two-photon absorption of the pump and Stokes beams and uses a Raman gain coefficient of diamond of 100 cm/GW. We also report on the observation of nanometer scale two-photon assisted etching of the diamond crystal surfaces.
我们展示了一种同步泵浦的金刚石拉曼激光器，其工作波长为275.7nm，由锁模Nd:YVO4激光器的四次谐波泵浦。该激光器的泵浦脉冲阈值能量为5.8nJ，转换效率为10.3%时可产生高达0.96nJ的脉冲。结果与一个数值模型吻合良好，该模型考虑了泵浦光和斯托克斯光的双光子吸收，并采用了金刚石100cm/GW的拉曼增益系数。我们还报告了对金刚石晶体表面纳米尺度双光子辅助蚀刻的观察结果。
