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实验研究了线偏振和圆偏振状态下的飞秒强激光脉冲在块状材料中的传输过程。不同偏振的激光脉冲在传输过程中得到了不同程度的光谱展宽,经色散补偿后,脉冲时域宽度均得到了压缩。详细分析了压缩脉冲的脉宽以及啁啾情况与入射激光脉冲能量之间的关系,比较了飞秒激光在线偏振及圆偏振情况下的不同压缩效果。在线偏振入射光情况下得到了最短21fs的压缩脉冲宽度,在圆偏振情况下得到的最短脉冲宽度为22fs。实验结果表明,这种光谱展宽与色散补偿方式对圆偏振光同样适用,而且圆偏振的入射激光将更有利于对更高能量的脉冲进行压缩。在色散补偿量相同的情况下,压缩效果随入射脉冲能量变化的规律符合理论估计。
The propagation of femtosecond laser pulses in bulk materials under linear and circular polarization was investigated experimentally. Different polarized laser pulses have different spectral broadening during the transmission. After dispersion compensation, the width of the pulse is compressed. The relationship between pulse width and chirp of pulsed laser pulse and energy of incident laser pulse is analyzed in detail. Different compression effects of femtosecond laser under linear and circular polarization are compared. In the case of linearly polarized incident light, a compressed pulse width of 21 fs minimum is obtained, and the shortest pulse width obtained in the case of circular polarization is 22 fs. Experimental results show that this spectral broadening and dispersion compensation methods are equally applicable to circularly polarized light, and circularly polarized incident laser light will be more advantageous for compressing higher energy pulses. In the case of the same amount of dispersion compensation, the compression effect changes with the incident pulse energy law consistent with theoretical estimates.