2μm状态可切换光纤激光器实验研究

Experimental study on 2 micron band state-switchable fiber laser

报道了一种2μm状态可切换的光纤激光器,该激光器结合萨格纳克环(Sagnac loop)和非线性放大环镜,通过调节泵浦功率和偏振控制器,能够稳定工作在2个不同区域,即多波长工作区(Ⅰ区)和多波长与锁模态可切换工作区(Ⅱ区)。Ⅰ区:激光器运行的中心波长为2017.4 nm,获得了19个稳定的波长,且相邻波长间隔为1.03 nm;Ⅱ区:激光器实现了多波长与锁模态之间的灵活切换,多波长态类似于Ⅰ区;其锁模态的脉冲宽度、光谱宽度和信噪比分别为1.62 ns,15.23 nm和34 dB。研究结果对2μm状态可切换光纤激光器输出动力学特性研究具有一定的指导意义。

A 2 micron band state-switchable fiber laser which combines a Sagnac loop and a nonlinear amplification loop mirror is reported in this paper.By adjusting the pump power and the polarization controller,the laser is capable of stable-operation in two regions(I and II).Region I,the multi-wavelength region with a central wavelength of 2017.4 nm,obtains 19 stable wavelengths with an adjacent wavelength interval of 1.03 nm.In region II,named switchable region of multi-wavelength state and mode-locked state,the output of the laser can be switched between multi-wavelength and mode-locked state by changing polarization controller.Its multi-wavelength state is similar to region I,and the pulse duration,spectral duration and signal-to-noise ratio of the mode-locked state are 1.62 ns,15.23 nm and 34 dB,respectively.Results in this paper are guiding significance for the research on output dynamics of 2 micron state-switchable fiber laser.