Effects of wavefront aberrations of lens on the optical simulator for free-space laser long-distance propagation

摘要

For the test of communication-performances of intersatellite laser communication terminals (LCT's) in lab, we had designed an optical simulator for long-distance propagation of laser beams based on optical Fourier transformer and the cascaded imaging systems. Its maximum equivalent propagation distance reaches several hundred thousands kilometers and it can be used to evaluate the communication performances of LCT's under exact transmission distance. In this paper, effects of wavefront aberrations of lens on the simulator are studied in detail. Firstly, we estimate the influence of wavefront aberrations of Fourier transform lens and the cascaded imaging lens according to the 'Strehl intensity'. We found that the wavefront aberrations of Fourier transform lens caused important measurement error. Secondly, using the aberration theory, the influence of typical aberrations such as spherical aberrations, Coma aberrations, Tip/tilt aberrations of Fourier transform lens is analyzed. Finely, the measurement error caused by these aberrations is provided.