Research On The Effect Of Atmosphere Upon Space Laser Communication And The Compensatory

The effects of the atmospheric turbulence disturbance for free-space laser communication systems are analyzed in the paper, and the correction of low-order modes with adaptive optics system for wave-front error are also discussed.The atmospheric turbulence effect the performance of free-space laser communication, and the atmospheric turbulence almost determined the operation distance of laser communication system. In the paper, some key technique such as low-order modes correction for wave-front error, normalized phase power spectrum, atmospheric turbulent phase structure function, the residual phase structure function after low-order correction and Strehl ratio are all analyzed. The results of Strehl ration calculation after low-order modes and tilt part correction at varies atmospheric turbulent intensity and phase spectrum descend efficiency are discussed detailed. The effect o.f laser beam transmission in the turbulent atmosphere with 4-dimension numerical analog program as well as phase compensation for adaptive optics are studied. The experimental results of low-order modes correction for wave-front error and the enhancement of Strehl ratio in detector and the improvement of wave-front tilt are also established.