Intra-cavity diamond Raman laser at 1634 nm

We demonstrated an eye-safe diamond Raman laser intra-cavity pumped by the 1.3 mu m fundamental field for the first time, to the best of our knowledge. The first-Stokes laser at 1634 nm was converted from the 1342 nm fundamental laser, which was produced by an in-band pumped double-end diffusion-bonded a-cut Nd:YV4 crystal. Under an incident pump power of 21.2 W and an optimal pulse repetition frequency of 25 kHz, the maximum average output power of 2.0 W was obtained with the pulse duration of 5.7 ns and the peak power of 14 kW. The first-Stokes emission was found to be near diffraction limited (M-2 approximate to 1.3) and to have a narrow linewidth (similar to 0.05 nm FWHM; instrument limited). (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement