Scattering Properties Of Blue-green Laser In Seawater And Its Depolarization Study

To study blue-green laser light scattering and polarization status changes in the ocean,is used to resolve the relative problem of optical communication,detection and imaging under water.In the paper,sea water characteristic of absorption and scatter- ing,and intrinsic optical character and extrinsic optical character of sea water are summed up;The scattering theories of sea water,including Rayleigh scattering ,Mie scattering by spherical particles and polarization theories of Mie scattering,are described in detail.It was studied in the article that scattering characteristic and its polarization status changes in the sea water are based on the Mie scattering theories of spherical parti- cle,Stokes vector and Muller matrix. A Monte Carlo algorithm was presented to model the relation between the scattering phenomenon,depolarization changes and sea water depth,It is discovered that the radius of scattering point and the degree of depolarization increase with increasing of the sea water depth.At last,a optical engineering software (LightTools) is introduced to simulate optical scattering in the deep sea water ,and studys the corelation between scattering and relative refractive index,particle density and particle size in the sea water.The experiment results show that the intensity of scattering will increase evidently with the increasing of particle size,particle density and relative refractive index.The methods and results in the article provide the basic theory and experiment validation for improving performance of communication ,detection and imaging under sea water.