Research Of The Effect Of The Optical System Wave-front Aberrations On The Far Field Distribution Of Beam

The space optical communication has become an effective method to accomplishhigh-speed satellite communication because of its remarkable advantages. The spaceoptical communication system needs receive enough intensity of beam to accomplish thelink. The satellite laser can link as far as tens of thousands of kilometers which demandsa high quality of both the beam light and communicational terminal.There must be a few errors due to the limitation of existed technique and theuncertainty of space environment, which lead to a wave-front aberration cause by themodulated optical antenna through the transmission. Then,the transportation of the powerand focusing of the beam will be effected seriously by the wave-front aberration, whichwill finally impair the inter-satellite communication link. As a result, it is quite necessaryto have a profound research and study on the far field distribution and quality of thebeam in order to contribute to the inter-satellite optical communication.Therefore, this dissertation studies the influence of wave-front aberrations on the farfield distribution of the beam, which includes the following aspects:base on the exsitingtheoretical model of the whole wave-front aberrations and local wave-front deformation,Iestablished the theoretical model for the couple of the two kinds of wave-frontaberrations and the theoretical analysis of the influence on the far field distribution withthe coupling;focus on the theoretical analysis of the influence on the highest power of thebeam and the position of the highest power of the beam; established a equivalent antennawith the Cassegrain antenna and the light space modulator,then researched the imitatedperformance of wave-front with the equivalent antenna and worked on the experimentalstudy of the influence on the far field position of the highest power of beam with tilt andlocal wave-front deformation.