Studies on the Aero-optical Phenomena of Free- vortex Aerodynamic Window's Jet

摘要

The concept of the free-vortex aerodynamic windows (FADW) is one of the best effective methods taking the place of the conventional beam output crystal windows of high power laser. An experimental model of the supersonic free-vortex aerodynamic window has been designed and made in our latest study. This paper studies the aero-optical phenomena of the FADW's supersonic jet to study the laser optical quality degradation caused by the free-vortex jet, and to find out the relation of output laser beam quality through the FADW to the structure of the FADW s supersonic jet. First it studies the beam quality using the methods of far-field beam profile measurement and lateral shearing interferometry, and then it uses the principle of matrix-optics interpreting the large-scale phase distortion in detail. At last the structure of FADW's jet has been studied by means of shadowgraphy.