Shearing interferometric investigation on degradation of light beam quality by the aerodynamic window's flow field

Shearing interferometer is used to investigate the degradation of light beam quality caused by the aerodynamic window's flow field. The principle of investigation is described. The problem of fringe patterns analyzing is solved. In the experiment, the degradation of light beam quality which is caused by the free-vortex aerodynamic window's flow field working in steady states is investigated.