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.

中文翻译：

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基于数字微镜阵列的波长柔性掺Do光纤激光器

通过数字微镜器件（DMD）与固定光栅结合使用，演示了波长可调掺th光纤激光器。基于二维光栅理论，分析了四种典型DMD模型的衍射特性及其对激光系统的操纵效率。通过在DMD上对反射图案进行空间调制，可以稳定，快速，灵活地调节1930 nm至2000 nm的激光波长，而波长调节精度为0.1 nm。在2μm频带附近，旁模抑制比大于50 dB，而3 dB的线宽小于0.05 nm。在室温下1小时内，波长漂移和功率波动分别低于0.05 nm和0.1 dB。