Tunable Narrow-Linewidth Ring Laser Based on the Polarization Conversion in a Tapered Fiber-Coupled Whispering Gallery Mode Resonator
Pengfa Chang,
Chen Wang,
Hong Han,
Feng Gao,
Ligang Huang,
Anbang Wang
Affiliations
Pengfa Chang
Key Lab of Advanced Transducers & Intelligent Control System, College of Physics & Optoelectronic, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China
Chen Wang
Key Lab of Advanced Transducers & Intelligent Control System, College of Physics & Optoelectronic, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China
Hong Han
Key Lab of Advanced Transducers & Intelligent Control System, College of Physics & Optoelectronic, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China
Feng Gao
MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin 300457, China
Ligang Huang
Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
Anbang Wang
Key Lab of Advanced Transducers & Intelligent Control System, College of Physics & Optoelectronic, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China
Based on the polarization conversion in a tapered fiber-coupled whispering gallery mode (WGM) system, a simple-structured narrow linewidth band-pass filter was fabricated and a narrow linewidth ring laser was demonstrated. With a fiber Bragg grating (FBG) to further select the resonant mode, the ring laser could be in the single-longitudinal-mode with the linewidth about 6 kHz and its wavelength could be tuned from 1540.10 nm to 1570.01 nm. Benefit from the dense modes in the WGM resonator, high conversion efficiency, and better stability of the structure, a tunable dual-wavelength laser could be achieved based on two FBGs with different resonant wavelengths. The configuration of the proposed laser is simple and stable, which will benefit its applications in the future.
