为了实现波长可调谐被动锁模掺铥光纤激光器, 提出了基于激光腔随机双折射效应通过调节激光偏振态来改变被动锁模掺铥光纤激光器的工作波长的方法, 并进行了原理分析和实验验证。结果表明, 调节偏振控制器可实现在2010nm, 2019nm, 2024nm, 2050nm等多个中心波长处的锁模脉冲输出, 同时在单个中心波长附近, 还可以精密调谐。这种可调谐锁模激光器结构简单、可调谐性好, 对光通信、超快光学、医学、遥感技术和雷达等应用中光源的选择有一定的参考价值。

In order to design a wavelength-tunable passively mode-locked thulium-doped fiber laser, the method of changing its working wavelength by adjusting the laser polarization state based on random birefringence effect of laser cavity was proposed. The principle analysis and experimental verification were carried out. The results show that, the adjustable polarization controller can achieve mode-locked pulse output at multiple central wavelengths such as 2010nm, 2019nm, 2024nm, 2050nm, and can also be tuned precisely near a single central wavelength. This kind of tunable mode-locked laser has simple structure and good tunability. It has certain reference value for light source selection in optical communication, ultrafast optics, medicine, remote sensing technology and radar.