Duo Jin 1,2Zhenxu Bai 1,2,3,*Zhongan Zhao 1,2Yifu Chen 1,2[ ... ]Zhiwei Lü 1,2,*
Author Affiliations
1 Center for Advanced Laser Technology, Hebei University of Technology, Tianjin, China
2 Hebei Key Laboratory of Advanced Laser Technology and Equipment, Tianjin, China
3 MQ Photonics Research Centre, Department of Physics and Astronomy, Macquarie University, Sydney, Australia
This study analyzes the linewidth narrowing characteristics of free-space-running Brillouin lasers and investigates the approaches to achieve linewidth compression and power enhancement simultaneously. The results show that the Stokes linewidth behavior in a free-space-running Brillouin laser cavity is determined by the phase diffusion of the pump and the technical noise of the system. Experimentally, a Stokes light output with a power of 22.5 W and a linewidth of 3.2 kHz was obtained at a coupling mirror reflectivity of 96%, which is nearly 2.5 times compressed compared with the linewidth of the pump (7.36 kHz). In addition, the theorical analysis shows that at a pump power of 60 W and a coupling mirror reflectivity of 96%, a Stokes output with a linewidth of 1.6 kHz and up to 80% optical conversion efficiency can be achieved by reducing the insertion loss of the intracavity. This study provides a promising technical route to achieve high-power ultra-narrow linewidth special wavelength laser radiations.
high power narrow linewidth single-frequency laser stimulated Brillouin scattering 
High Power Laser Science and Engineering
2023, 11(4): 04000e47

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