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.
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).
