High-temperature linearly polarized single-frequency fiber lasers based on a non-polarization-maintaining FBG preparation through a femtosecond laser

• DOI: 10.1364/ol.463062
• Publication Date: 2022-07-21T13:30:11Z
• Authors: Ruidong Lv; Tao Chen; Xuantung Pham; Jinhai Si; Jin Huang; Yuxing Hou; Bo Gao; Xun Hou
• Keywords: Laser linewidth; Fiber Bragg Grating

A high-temperature-resistant linearly polarized single-frequency distributed Bragg reflector fiber laser is demonstrated by using a femtosecond and directly fabricating pair of gratings (FBGs) into an erbium-doped (EDF). high-reflection FBG with high birefringence prepared overexposure used as polarization selector. The integrated resonator cavity 0.82 cm to ensure operation. After annealing treatment, the can work stably at 600°C, no mode hopping happens different temperatures. By residual pump light suitable EDF amplify laser, narrow linewidth output power 26.3 mW, degree reaching 0.984, less than 4 kHz obtained.