Opt Express. 2023 Jan 16;31(2):2902-2910. doi: 10.1364/OE.476673.
The self-starting performance of a figure-9 fiber laser is critically dependent on the phase shift difference between the counter-propagating beams. Herein, we propose an effective approach to dynamically control the phase shift difference in a figure-9 fiber laser by utilizing the thermal nonlinearity of graphene-decorated microfiber device. With the adjustment of the control laser power injected into the graphene-decorated microfiber, the self-starting mode-locked threshold of the figure-9 fiber laser can be attained in a flexible pump power range, i.e., from 300 mW to 390 mW. These findings demonstrated that the graphene-decorated microfiber could act as a dynamical control device of phase shift difference for improving the performance of figure-9 fiber lasers, and might also open up new possibilities for applications of microfiber photonic devices in the field of ultrafast optics.
环形光纤激光器的自启动性能严重依赖于反向传播光束之间的相移差。本文提出了一种通过利用石墨烯修饰微光纤器件的热非线性来动态控制环形光纤激光器中相移差的有效方法。通过调节注入石墨烯修饰微光纤的控制激光功率，可以在灵活的泵浦功率范围内实现环形光纤激光器的自启动锁模阈值，即 300 mW 至 390 mW。这些发现表明，石墨烯修饰微光纤可以作为改善环形光纤激光器性能的相移差动态控制装置，也可能为微光纤光子器件在超快光学领域的应用开辟新的可能性。
