中文摘要：

分析了光在海水中的吸收效应和散射效应；并通过使用半解析蒙特卡罗方法模拟了蓝绿激光在海水中的传输过程，获得前向散射光斑截面光子数随散射角平均余弦值、衰减系数、海水单次散射反照率和距离等参数变化而变化的规律，即随着传输距离的增加，前向散射光斑截面光子数增大，达到一定距离后，增加趋于平缓；光子数随着传输距离的增加呈类指数下降的趋势：相同传榆距离、不同水质参数，光子数差异较大．研究结果对水下激光目标探测有一定的参考价值．

英文摘要：

The intensive absorption and scattering caused by seawater extremely affect the operating range and the detecting capability of underwater laser imaging technology. The absorption effect and the scattering effect of light in the seawater are analyzed. By using semi-analytical Monte Carlo algorithm, the process of how the blue-green laser transmits in the seawater is simulated. And the rules of how the photon number of the forward scatter light spot changes with the parameters, such as the average cosine of the scattered angles, the attenuation coefficient, the seawater single-scattering albedo and distance, are obtained. When the transmit distance increases, the photon amount of the forward scatter light spot will increase and tend to stable after reaching a certain distance. The photon amount has an analogous exponential downtrend when the transmit distance increases. At the same transmit distance but with different water quality parameters, the photon amount has big differences.