具有扭曲相位的部分相干矢量光束在海洋湍流中的传输特性

Propagation characteristics of partially coherent vector beam with twisted phase in ocean turbulence

基于扩展的惠更斯-菲涅耳原理和维格纳分布函数(Wigner distribution function,WDF)相结合的方法,推导了部分相干扭曲矢量光束(partially coherent twisted vector beam,PCTVB)在海洋湍流中的M^(2)因子和角扩展的解析式。数值模拟表明:通过调控束腰宽度、扭曲因子、初始相干长度和波长能在一定程度上提高光束抗湍流能力。减少光束初始相干长度,增加波长和束腰宽度可使光束有更小的M^(2)因子,而增大扭曲因子的绝对值,使光束的M^(2)因子更小,光束的抗湍流干扰性更强。随着海洋湍流的温度方差耗散率与温度和盐度比率的减小,动能耗散率、各向异性因子的增加,海洋湍流对光束的影响变小,光束将具有更好的传输质量。

Based on the method of combining the extended Huygens-Fresnel principle with the Wigner distribution function(WDF),the analytical expression of M^(2)factor and angular width of partially coherent twisted vector beam(PCTVB)in ocean turbulence is derived.Numerical simulation shows that the anti-turbulence ability of beam can be improved to some extent by adjusting beam waist width,twisted factor,initial coherence length,wavelength.Decreasing the initial coherence length,increasing wavelength and waist width can make the beam have a smaller M^(2)factor,while increasing the absolute value of the twisted factor,the M^(2)factor of the beam is smaller,and the anti-turbulence interference of the beam is stronger.As the temperature variance dissipation rate and the ratio of temperature and salinity decrease,the dissipation rate of kinetic energy and anisotropy factor increase,the effect of ocean turbulence on beam becomes smaller and the beam will have better propagation quality.