匡鸿深, 赵方舟, 高静, 葛廷武, 王智勇. 高功率光纤激光器中自相位调制的实验研究[J]. 红外与激光工程, 2014, 43(9): 2849-2853.
引用本文: 匡鸿深, 赵方舟, 高静, 葛廷武, 王智勇. 高功率光纤激光器中自相位调制的实验研究[J]. 红外与激光工程, 2014, 43(9): 2849-2853.
Kuang Hongshen, Zhao Fangzhou, Gao Jing, Ge Tingwu, Wang Zhiyong. Experimental research on self-phase modulation of high power fiber laser[J]. Infrared and Laser Engineering, 2014, 43(9): 2849-2853.
Citation: Kuang Hongshen, Zhao Fangzhou, Gao Jing, Ge Tingwu, Wang Zhiyong. Experimental research on self-phase modulation of high power fiber laser[J]. Infrared and Laser Engineering, 2014, 43(9): 2849-2853.

高功率光纤激光器中自相位调制的实验研究

Experimental research on self-phase modulation of high power fiber laser

  • 摘要: 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2.5 nm,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。

     

    Abstract: An experimental research on self-phase modulation (SPM) of high power picosecond pulse amplifier was conducted by high-power all-fiber picosecond pulse fiber laser with an MOPA configuration. The seed source is a self-built fiber laser passively mode-locked by semiconductor saturable absorber mirror (SESAM). To avoid nonlinear effect, the repetition rate of the seed pulse should be increased to 328 MHz through a self-made repetition multiplier before amplification. The amplifier employed a three-level amplifying structure and finally received a stable picosecond pulse laser output with a center wavelength of 1 066.5 nm, a 3 dB spectrum width of 2.5 nm, and an average power of 91W. In the experiment, there was research on change of spectrum caused by SPM in the process of amplification. An analysis of the output spectrum of the laser demonstrates that with the increase of power, the influence of the initial chirp and the shape of the pulse on the SPM effect of high power fiber laser becomes deepens. In the mean time, it is also influenced by self-steepening effect.

     

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