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利用主振荡功率放大(MOPA)结构高功率皮秒脉冲全光纤激光器,对高功率皮秒脉冲放大器中自相位调制(SPM)效应进行了实验研究。激光器种子源是自行搭建的半导体可饱和吸收镜(SESAM)被动锁模光纤激光器。为了抑制非线性效应,使用一个自制重频倍增器把种子脉冲的重频增加到328 MHz后再放大。放大器部分采用三级放大结构,最终获得了中心波长为1 066.5 nm,3 dB光谱线宽约为2.5nm,平均功率为91W的稳定皮秒脉冲激光输出。实验对光脉冲在放大的过程中自相位调制引起的光谱变化进行了研究。对激光器输出光谱的分析表明,随着功率的增大,高功率光纤激光器中自相位调制效应受到入射脉冲的初始啁啾和脉冲形状的影响程度也随着变大,与此同时还受到自陡峭效应的影响。
The self - phase modulation (SPM) effect in high power picosecond pulse amplifiers was experimentally investigated with the MOPA high power picosecond pulse all - fiber laser. The laser seed source is self-built semiconductor saturable absorption mirror (SESAM) passively mode-locked fiber laser. In order to suppress the non-linear effect, a self-made multiplier is used to increase the repetition rate of the seed pulse to 328 MHz. Amplifier part of the three-stage amplification structure, the final center wavelength of 1066.5 nm, 3 dB spectral width of about 2.5nm, the average power of 91W stable picosecond pulse laser output. Experiments on the optical pulse amplification in the process of self-phase modulation caused by spectral changes were studied. The analysis of the output spectrum of the laser shows that the self-phase modulation effect of the high-power fiber laser increases with the increase of the power due to the initial chirp of the incident pulse and the shape of the pulse, and at the same time it is steep Effect of the effect.