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在基于非线性偏振旋转效应的被动锁模光纤激光器中,利用测量脉冲光谱边带的方法计算腔内总色散,通过改变腔内普通单模光纤(SMF)的长度实现色散匹配,从而获得了重复频率为25 MHz、脉宽为520.5 fs、中心波长为1 558.4 nm和3 dB带宽为29.5 nm的超短脉冲,输出功率为1.81 mW。在实现最佳色散匹配的条件下,对锁模脉冲的分裂、连续光波与孤子脉冲共存以及稳定的谐波锁模现象进行了实验研究和分析。
In the passive mode-locked fiber laser based on the non-linear polarization rotation effect, the total intracavity dispersion is calculated by measuring the spectral sideband of the pulse, and the dispersion matching is achieved by changing the length of the ordinary single-mode fiber (SMF) in the cavity, Ultrashort pulses at 25 MHz with a pulse width of 520.5 fs, a center wavelength of 1 558.4 nm and a 3 dB bandwidth of 29.5 nm deliver an output power of 1.81 mW. Under the condition of the best chromatic dispersion matching, the phenomenon of the splitting of the mode-locked pulse, the coexistence of the continuous light wave and the soliton pulse and the stable harmonic mode-locking phenomenon are studied experimentally.