中文摘要：

随着超短脉冲激光的快速发展，吸收散射性介质内的瞬态辐射传输引起了广泛的关注。本文采用最小二乘有限元法模拟了超短脉冲激光局部入射条件下，具有高散射核的二维非均匀介质内的瞬态辐射传输。研究了不同边界位置上反射和透射信号随时间的变化情况。结果表明，对于具有高散射核的非均匀介质，能够揭示散射核位置的双峰现象可能在早期的反射信号中发生，早期的反射信号比后期的、经过介质衰减后信号更重要。因此，在利用短脉冲激光进行光谱分析和成像等技术中，人们应该重视早期反射信号的测量。

英文摘要：

With the rapid progress on the ultra-short pulse laser, the transient radiative transfer in the absorbing and scattering media has attracted increasing attention. The transient radiative transfer of ultra-short pulse in a two-dimensional inhomogeneous media with high-scattering core is investigated by least-squares finite element method in present paper. The time-resolved reflected and transmitted signals at the different locations are compared and analyzed. The results indicate the ＇dual peak＇ phenomenon, which can imply the location of scattering core, could happen in the early reflected signals. Therefore, the early reflected signals are more important than long-term, attenuated signals by the media, and should not been ignored in spectroscope or optic imaging technique.