基于腔内的模式选择耦合器(MSC),报道了一种输出模式可切换的调Q脉冲掺铒光纤激光器。通过布拉格光栅和MSC的共同作用,实现输出波长的选择和不同模式间的转换。由于MSC具有模式分离特性且激光腔具有双支路输出配置,通过调整腔内损耗可以实现对激光输出不同模式间的切换,成功地观察到了同时具有线偏振模式(LP01模式和LP11模式)的双波长调Q脉冲输出,该模式可切换激光器可以应用在通信、粒子捕获等领域。

Based on the mode selective coupler (MSC) in a cavity, a Q-switched pulsed erbium-doped fiber laser with switchable output modes is reported in this work. Through the joint action of the Bragg grating and MSC, the output wavelength selection and the conversion between different modes are realized. Because the MSC has mode separation characteristics and the laser cavity has a dual-branch output configuration, the laser output can be switched between different modes by adjusting the cavity loss. The dual wavelength Q-switched pulse output with linear polarization modes (LP01 mode and LP11 mode) is successfully observed. The laser with switchable output modes can be used in communication, particle trapping, and other fields.