光纤饱和吸收体稳频窄线宽光纤激光器

结合光纤饱和吸收体与光纤光栅法布里-珀罗标准具,研制出了全光纤结构1550nm单频窄线宽掺铒光纤环形激光器.采用两个976nm激光二极管双向抽运作为抽运源,高掺杂浓度铒光纤作为增益介质,以行波腔消除空间烧孔效应,利用光纤光栅法布里-珀罗标准具窄带选模特性,以10m长低掺铒光纤饱和吸收体稳频,得到了十分稳定的窄线宽激光输出.激光器抽运阈值功率21mW,在抽运光功率为145mW时输出光功率39mW,斜率效率30%,信噪比大于50dB.采用延迟自外差方法精确测量光纤激光器线宽小于10kHz.

Frequency stabilized narrow linewidth fiber laser by fiber saturable absorber

Single frequency 1550nm Erbium-doped fiber ring laser was demonstrated by introducing fiber saturable absorber and passive fiber Bragg grating Fabry-Perot etalon in laser cavity. As narrow bandwidth filter, the passive fiber Bragg grating Fabry-Perot etalon discriminated and selected laser longitudinal modes efficiently. Spatial hole burning effect was eliminated by traveling-wave cavity. Lasing frequency was stabilized by using 10m low concentration Erbium-doped fiber as saturable absorber. Stable single frequency 1550nm laser was acquired. High concentration Erbium-doped fiber was adopted as gain medium in the fiber laser. Pumped by two 976nm laser Diodes, the fiber laser has a threshold of 21mW. Laser output power is 39mW at 1550nm with a pump power of 145mW, and the corresponding slope efficiency is 30%. The SNR is larger than 50dB. The laser linewidth is less than 10kHz, measured by the delayed self-heterodyne method with 10km single mode fiber.