为了实现锁模光纤激光器的波长可调谐, 采用半导体可饱和吸收镜(SESAM), 搭建了环形腔被动锁模掺镱光纤激光器。在腔内无偏振控制器及可调谐滤波器等器件的前提下, 通过改变光纤跳线端面至SESAM的距离, 实现光谱在1029.5nm~1042.7nm之间的稳定可调谐, 基频重复频率为18.0MHz, 脉冲宽度为130ps, 锁模脉冲信噪比达44dB。结果表明, 该锁模光纤激光器具有较高的信噪比及较宽的可调谐范围。该研究为可调谐被动锁模光纤激光器的研制提供了重要的参考价值。

In order to realize wavelength tunability of mode-locked fiber laser, a passively mode-locked ytterbium-doped fiber laser with ring cavity was constructed with a semiconductor saturable absorber mirror (SESAM). Without any polarization controllers and tunable filters in the cavity, by changing the distance between the end face of the optical fiber jumper and the SESAM, the stable tunability of the spectrum was achieved between 1029.5nm and 1042.7nm. The fundamental frequency repetition rate was 18.0MHz, the pulse width was 130ps, and the signal-to-noise ratio of mode-locked pulse was 44dB. The results show that, the mode-locked fiber laser has a high signal-to-noise ratio and a wide tunable range. This study provides an important reference for the development of tunable passively mode-locked fiber lasers.