报道了一种基于单壁碳纳米管可饱和吸收体、工作波长可切换的被动锁模光纤激光器。利用可饱和吸收体薄膜厚度调节腔内损耗,不仅实现了基频被动锁模脉冲序列的稳定输出,还有效控制了掺铒光纤激光器的增益谱线。实验表明,当腔内可饱和吸收体薄膜较薄或者较厚时,激光器可以分别产生中心波长为1545nm和1562nm的脉冲;当腔内可饱和吸收体薄膜厚度介于较薄和较厚之间的适当值时,仔细调整偏振控制器,可以实现激光器在这两个中心波长之间相互切换的稳定锁模运转,在切换的过程中还可观察到这两个中心波长同时出现的锁模现象。 A passive mode-locked fiber laser based on a single-walled carbon nanotube saturable absorber with switchable operating wavelength is reported. Utilizing the film thickness of saturable absorber to adjust the cavity loss, not only the stable output of passive mode-locked pulse sequence at fundamental frequency but also the gain spectrum of erbium-doped fiber laser is effectively controlled. Experiments show that when the thin film of the saturable absorber in the cavity is thinner or thicker, the laser can generate pulses with central wavelengths of 1545nm and 1562nm, respectively. When the thickness of the saturable absorber in the cavity is between thinner and thicker Appropriate value, carefully adjust the polarization controller, you can achieve the laser in the two center wavelength switching between stable mode operation, the switching process can be observed at the same time the two center wavelength mode-locking phenomenon.