Linewidth narrowing in free-space-running diamond Brillouin lasers  

作　　者：Duo Jin Zhenxu Bai Zhongan Zhao Yifu Chen Wenqiang Fan Yulei Wang Richard P.Mildren Zhiwei Lü 

机构地区：[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

出　　处：《High Power Laser Science and Engineering》2023年第4期25-32,共8页高功率激光科学与工程（英文版）

基　　金：the National Natural Science Foundation of China(No.61927815);the Natural Science Foundation of Tianjin City(Nos.22JCYBJC01100 and 20JCZDJC00430);the Shijiazhuang Overseas Talents Introduction Project(No.20230004);the Program of State Key Laboratory of Quantum Optics and Quantum Optics Devices(No.KF202201);Funds for Basic Scientific Research of Hebei University of Technology(No.JBKYTD2201);D.J.acknowledges the support from the Postgraduate Innovation Ability Training Program of Hebei Province(No.CXZZBS2021030);R.P.M.acknowledges the support from the Asian Office of Aerospace Research and Development(AOARD).

摘　　要：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 60Wand 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.

关 键 词：high power narrow linewidth single-frequency laser stimulated Brillouin scattering 

分 类 号：TN248[电子电信—物理电子学]