Chen Xiao, Dai Dezheng, Zhang Yi, Wu Hongyuan, Gao Yunshu, Chen Genxiang, Wang Yiquan
College of Science, Minzu University of China, Beijing 100081, China.
Micromachines (Basel). 2020 Nov 25;11(12):1036. doi: 10.3390/mi11121036.
Wavelength-tunable thulium-doped fiber laser is demonstrated employing a digital micromirror device (DMD) in combination with a fixed grating. The diffraction property of four typical models of DMDs and its steering efficiency for the laser system are analyzed based on two-dimensional grating theory. By spatially modulating reflective patterns on a DMD, the stable, fast, and flexible tuning of lasing wavelength from 1930 nm to 2000 nm is achieved with wavelength tuning accuracy of 0.1 nm. The side-mode suppression ratio is larger than 50 dB around the 2 μm band with 3 dB linewidth less than 0.05 nm. The wavelength drift and power fluctuation are lower than 0.05 nm and 0.1 dB within 1 h at the room temperature, respectively.
采用数字微镜器件（DMD）与固定光栅相结合的方式，展示了波长可调谐掺铥光纤激光器。基于二维光栅理论，分析了四种典型型号DMD的衍射特性及其对激光系统的转向效率。通过在DMD上对反射图案进行空间调制，实现了从1930 nm到2000 nm的激光波长的稳定、快速和灵活调谐，波长调谐精度为0.1 nm。在2μm波段附近，边模抑制比大于50 dB，3 dB线宽小于0.05 nm。在室温下，波长漂移和功率波动在1小时内分别低于0.05 nm和0.1 dB。
