从理论上和实验上对飞秒激光脉冲通过散射表面后的时域特性进行了研究分析。用频率分辨光学开关法对通过散射表面前后的飞秒脉冲进行了测量和对比。理论分析和实验结果表明, 由于散射表面对飞秒脉冲的散射导致飞秒脉冲的展宽和形状的畸变。输入脉冲在时间相关函数的半峰全宽为64 fs; 透射脉冲在时间相关函数半峰全宽的平均值为117 fs。对透射脉冲场的统计特性进行了讨论, 透射脉冲场实部和虚部的概率函数分布遵从高斯函数分布; 强度的概率分布遵从指数分布规律; 给出了入射飞秒脉冲强度的自相关函数分布和飞秒时域散斑场强度的互相关函数分布的实验结果, 并且对二者的时间相关函数进行了讨论。

The time domain characteristics of femtosecond pulse propagation through a scattering surface are investigated theoretically and experimentally. The input femtosecond pulse and output pulse from scattering surface are measured and compared by frequency-resolved optical gating. Theoretical analysis and experimental results show that when femtosecond pulse propagates through scattering surface, it will be broadened and distorted. The full time width at half maximam peak of input pulse is 64 fs, and the average of that of transmitted pulse is 117 fs. The characteristics of the transmitted pulse are discussed. Probability functions of real and imaginary components of transmitted pulse show good agreement with Gaussian distribution. Probability distribution of the intensity follows exponential distribution. The experimental results of the intensity autocorrelation of input pulse and intensity correlation of femtosecond time domain scattered field shown, and the time correlation between them are also discussed.