The determination of bum depth is sn importsnt problem for surgeons to remedy severe skin bums. The bum can be simplified as a two-layer media medel: a static layer and a dynamic layer. In this paper, the relative fluctuation of backscattering light intensity was used to determine the simulated bum depth. The experimental results show that the relative fluctuation of light intetensity increases with the simulated bum depth and the depth less than 0.1mm can be resolved. This new method may be useful for bum diagnosis.

研究了生物组织中散射光子程长的概率分布函数P（t）及其一阶统计性质。并由P（t）导出了二阶统计量——漫射光时间自相关函数g1（r）的表达式，讨论了影响g1（r）衰减快慢的因素。

Isolation of a new structured acousto optic switch based on an integTatcd optical polarization independent quasi collinear acousto optic tunaSIe filter is studied in detail. The factors that influence the isolation of the optical switch are analysed, the expressions of the isolation are educed, and the isolation of the dev/ce is measured in experiment. It is found that the isolation mainly depends on the TE/TM mode intensity ratio, the mode splitter extinction rate, and the conversion efficiency.

Influences of the scattering phase functions on spatially resolved diffuse reflectance from a homogenous semi-infinite medium close to source are studied with Monte Carlo simulation. It is shown that the influences of optical parameters higher than the second order on the diffuse reflectance are quite weak in the region from 0.3 to several transport mean free pathes when Henyey-Greenstein phase function or a combined phase function of two parameters are used. But this influence may be substantial if the double Henyey-Greenstein function is used to describe the scattering property of tissue.

在集成声光可调谐滤波器（AOTF）工作时，由于环境温度变化以及自身声表面波吸收使器件的温度发生变化，导致滤出波的中心波长发生漂移。在理论分析的基础上，对声光可调谐滤波器的温度特性进行了实验研究，并在此基础上提出一种新的解决方案：用动态控制射频信号来实现声光可调谐滤波器的稳频输出，并用该方案实现了中心波长的漂移控制在0.08nm以内，满足了波分复用（WDM）通信系统的应用要求。