Qin Qi, Yan Fengping, Liu Yan, Guo Ying, Li Ting, Guan Biao, Han Wenguo, Bai Zhuoya, Suo Yuping, Zhou Hong, Feng Ting
Opt Express. 2021 Mar 29;29(7):9786-9796. doi: 10.1364/OE.419283.
This research experimentally demonstrates a switchable, single-wavelength, thulium-doped fiber laser based on the cascading of a multimode-single-mode-multimode (MSM) fiber filter and a two-mode fiber (TMF) filter. When the MSM fiber filter suffers from bending, the blue-shift of the output spectrum can be obtained. A switchable lasing wavelength output is realized by bending the MSM fiber filter to cover different channels of the TMF filter. The output wavelength can be switched from 1982.54 to 1938.81 nm with an optical signal-to-noise ratio of higher than 40 dB. The wavelength interval of the switchable output is an integral multiple of the wavelength interval of the TMF filter. The stability of the output wavelength was tested within 60 min, and the wavelength shift and output power fluctuation were found to be less than 0.01 nm and 0.31 dB, respectively, which demonstrates a stable output performance.
本研究通过实验展示了一种基于多模-单模-多模（MSM）光纤滤波器和双模光纤（TMF）滤波器级联的可切换单波长掺铥光纤激光器。当MSM光纤滤波器发生弯曲时，可获得输出光谱的蓝移。通过弯曲MSM光纤滤波器以覆盖TMF滤波器的不同通道，实现了可切换的激光波长输出。输出波长可在1982.54至1938.81nm之间切换，光信噪比高于40dB。可切换输出的波长间隔是TMF滤波器波长间隔的整数倍。在60分钟内测试了输出波长的稳定性，发现波长偏移和输出功率波动分别小于0.01nm和0.31dB，这表明了稳定的输出性能。
