激光大气传输中的不完全相位共轭数值模拟

采用含时四维程序数值模拟了激光在湍流大气巾传输的不完全相位共轭。比较了不同孔径信标对探测光的反射率，考察了中弱湍流条件下采用不同孔径信标传输不同距离时硬孔的相位共轭保真度和反射率随湍流结构常数的变化规律，及强湍流条件下采用不同孔径信标时软孔的相位共轭保真度和反射率与高斯孔径的关系。结果显示：中、弱湍流条件下，直到3km传输距离，0．5m的接收孔径都足以提供点信标较为理想的相位共轭补偿，3km传输中等程度湍流下Cn^2=10^-15m^-，大信标有较为明显的优势，其保真度高于小信标．所需的系统放大倍率也远低于小信标；3km传输强湍流下Gn^2=10^-13m^-2/3，大信标的保真度反而低，而PCM孔径小时也能获得较高的保真度。

Numerical Simulations of Incomplete Phase Conjugation for Laser Propagation in Turbulent Atmosphere

The four-dimension program including time were used to simulate incomplete phase conjugation for laser propagation in turbulent atmosphere.The reflectivity of the beacon with different aperture were compared,the dependence of reflectivity and fidelity of phase conjugation beam of the hard aperture on the turbulence structure constant by different beacon aperture deliverinig different range in the condition of middle and weak turbulence,and the dependence of reflectivity and fidelity of phase conjugation beam of the soft aperture on the Gaussian aperture W by different beacon aperture in the condition of strong turbulence were investigated.It was showed that 0.5 m accepting aperture could provide ideal compensation to point beacon up to 3 km propagating distance underthe condition of middleand weak turbulence;and the bigger beacon had higher fidelity and it needed much lower system magnification than that of the smaller beacon when the propagating distance was 3 km under the condition of middle turbulence of C_n~2=10~(-15) m~(-2/3);on the contrary the bigger beacon had lower fidelity than that of the smaller beacon,meantime the PCM with smaller aperture could get higher fidelity when the propagating distance was 3 km under the condition of strong turbulence of C_n~2=10~(-13) m~(-2/3).