Transmission Characteristics Of Polarized Laser Beam On Slant Path In Turbulent Atmospheric

Laser beam propagation properties on slant path in turbulence atmospheric have been extensively investigated both in the theory and through practical applications. Currently, the main is the use of partially coherent light source to study wander and spreading of the beam on slant path in turbulence atmospheric, and use less polarized and partially coherent light source. As people of atmospheric optical research are unceasingly thorough, waves of coherence and polarization with its characteristics have been widely attention. Coherence and polarization of the formation of the theory, unifying research spectral characteristics, coherence and polarization of the laser beam become possible. In terms of polarized partially coherent laser, Atmospheric turbulence affects laser beams by causing beams to wander and spreading. This phenomenon must be considered to improve the performance of the laser work system. At the same time, must consider polarized partially coherent laser beam depolarization characteristics.The polarized and partially coherent laser beam is taken as a study object. Light intensity, barycentric coordinate, spreading radius and degree of polarization change of laser beam propagation on slant path in turbulence atmospheric is analyzed. According to extended Huygens-Fresnel principle, the Gaussian-shell model beam (GSM) is taken as model. The analytical expression for light intensity, barycentric coordinate, spreading radius, spreading angle and degree of polarization of beam on the slant path are derived. Changes in wander, spreading, and depolarization of polarized laser propagated on slant path in turbulent atmosphere are simulated. The effects of the phase difference between two orthogonal components of polarization beam, direction angle, wavelength, initial waist radius and receiver height on barycentric coordinate and spreading radius of laser beam are to get under the certain propagation distance. The effects of wavelength, initial spot size and transmission distance on light intensity and degree of polarization of laser beam are to get under the certain receiver height.Through analyzing the light intensity, wander, spreading and depolarization characteristics of the polarized and partially coherent laser beams on slant path in turbulent atmosphere, conclusions can be drawn as follows:when the light initial waist radius increases, the effect of wander and spreading of beam with the increase of the transmission distance change is smaller under the certain receiver height; on the contrary, with the increasing wavelength, the greater the beam drift and expand effect with the increase of the transmission distance change; The effect of wander and spreading of beam decreases with the increasing receiver height under the certain slant path transmission distance; The longer wavelength, the degree of polarization in the receiver of the more stable distribution under the certain slant path transmission distance and receiver height. The conclusions could provide theoretical basis to research propagation quality of polarized and partially coherent laser in an external field of turbulent atmosphere. The conclusions also play an important role in the use of laser work system, such as laser communication, laser ranging, satellite remote sensing, laser weapon, laser energy transmission, laser target recognition and spatial beam coding and decoding.