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Efficient analysis of temporal broadening of a pulsed focused Gaussian beam in scattering media

机译：散射介质中脉冲聚焦高斯光束的时间展宽的高效分析

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摘要

We show that the temporal broadening of a pulsed, tightly focused TEM_(oo) beam propagating in a scattering medium can be accurately modeled as a convolution between the initial pulse profile and an effective impulse response that is given by the propagation behavior of an infinitely thin pulse in the said medium. The impulse response is obtained with a Monte Carlo (MC) analysis of the propagating photons in the impulse. Our algorithm is 2 orders of magnitude less complex than the full MC solution of the pulse propagation problem. The accuracies, however, are comparable even for scattering path lengths that are 20 times the mean free path.
机译：我们表明，在散射介质中传播的脉冲，紧聚焦的TEM_（oo）束的时间展宽可以准确地建模为初始脉冲轮廓与有效脉冲响应之间的卷积，该响应由无限薄的传播行为给出在所述介​​质中脉动。脉冲响应是通过对脉冲中传播的光子的蒙特卡洛（MC）分析获得的。我们的算法比脉冲传播问题的完整MC解决方案复杂度低2个数量级。但是，即使散射路径的长度是平均自由路径的20倍，其精度也是相当的。

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