中国激光, 2019, 46 (1): 0101003, 网络出版: 2019-01-27
基于保偏掺铥光纤饱和吸收体的2 μm波段超窄线宽光纤激光器 下载: 1163次
Ultra-Narrow-Linewidth Fiber Laser in 2 μm Band Using Saturable Absorber Based on PM-TDF
摘要
制作了一种单纵模超窄线宽环形腔掺铥光纤激光器, 使用未抽运的保偏掺铥光纤作为饱和吸收体, 结合光纤光栅法布里-珀罗滤波器, 实现了激光器的单纵模运转和超窄线宽输出。实验结果表明:激光器在室温下可以获得中心波长为1942.03 nm、光信噪比为63 dB的稳定输出。通过100 min的连续测量, 激光输出功率的波动小于0.62 dB, 中心波长的波动小于光谱仪的最小分辨率0.05 nm, 在一定时间内具有良好的稳定性。采用基于频率噪声的线宽测量方法测得0.01 s测量时间下的线宽为300 Hz, 在0.1 s测量时间下的线宽约为3 kHz。所制作的激光器将在对2 μm波段激光纵模及线宽特性有严格要求的领域具有重要应用价值。
Abstract
In this paper, a ring cavity Tm-doped fiber laser with both single longitudinal mode and ultra narrow linewidth is proposed and demonstrated. An unpumped polarization maintaining Tm-doped fiber (PM-TDF) and a narrowband F-P filter are combined to realize the single longitudinal mode lasing operation and ultra narrow linewidth. Experimental results show that the proposed laser is stably operating at central wavelength of 1942.03 nm and the optical signal-to-noise ratio is 63 dB at room temperature. Through 100 minutes of continuous measurement, the output power fluctuation is less than 0.62 dB and the center wavelength shift is less than the minimum resolution of the spectrometer of 0.05 nm. This indicates that it has good stability for a certain period of time. Through the linewidth measurement based on frequency noise, linewidth of the laser under the measuring time of 0.01 s and 0.1 s are 300 Hz and 3 kHz, respectively. The proposal will be applied significantly in the field where the longitudinal mode and linewidth specificity of a laser are strictly required for 2 μm wave band.
白燕, 延凤平, 冯亭, 韩文国, 张鲁娜, 程丹, 白卓娅, 温晓东. 基于保偏掺铥光纤饱和吸收体的2 μm波段超窄线宽光纤激光器[J]. 中国激光, 2019, 46(1): 0101003. Bai Yan, Yan Fengping, Feng Ting, Han Wenguo, Zhang Luna, Cheng Dan, Bai Zhuoya, Wen Xiaodong. Ultra-Narrow-Linewidth Fiber Laser in 2 μm Band Using Saturable Absorber Based on PM-TDF[J]. Chinese Journal of Lasers, 2019, 46(1): 0101003.