High-power free-running single-longitudinal-mode diamond Raman laser enabled by suppressing parasitic stimulated Brillouin scattering

Author:

Liu YuxuanORCID,Zhu Chengjie,Sun YuxiangORCID,Mildren Richard P.,Bai Zhenxu,Zhang Baitao,Chen Weibiao,Chen Dijun,Li Muye,Yang XuezongORCID,Feng Yan

Abstract

Abstract A continuous-wave (CW) single-longitudinal-mode (SLM) Raman laser at 1240 nm with power of up to 20.6 W was demonstrated in a free-running diamond Raman oscillator without any axial-mode selection elements. The SLM operation was achieved due to the spatial-hole-burning free nature of Raman gain and was maintained at the highest available pump power by suppressing the parasitic stimulated Brillouin scattering (SBS). A folded-cavity design was employed for reducing the perturbing effect of resonances at the pump frequency. At a pump power of 69 W, the maximum Stokes output reached 20.6 W, corresponding to a 30% optical-to-optical conversion efficiency from 1064 to 1240 nm. The result shows that parasitic SBS is the main physical process disturbing the SLM operation of Raman oscillator at higher power. In addition, for the first time, the spectral linewidth of a CW SLM diamond Raman laser was resolved using the long-delayed self-heterodyne interferometric method, which is 105 kHz at 20 W.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Publisher

Cambridge University Press (CUP)

Subject

Nuclear Energy and Engineering,Nuclear and High Energy Physics,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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1. High power tunable Raman fiber laser at 1.2 μm waveband;Frontiers of Optoelectronics;2024-01-15

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