Study on the optical properties of free-vortex aerodynamic window using far-field method

Theoretical and experimental study on the optical properties of the free-vortex aerodynamic window (FADW) using the method of far-field beam is described. It mainly reports the deflexion and jitter of the far-field converged beam of He-Ne laser through the FADW.And the beam quality factor b of the FADW has been defined and studied in particular. At the same time it discusses the effect on the far-field beam spatial distribution of the FADW.At last it proposes the reference of the further study on the beam quality and the optimize design of the FADW.