Because of the intrinsic fractional absorption of the laser energy with the conventional solid output windows for high energy lasers (HEL),the optical quality will be degraded,or the overall HEL system cannot run at all when the laser energy are far higher,or the system runs longer time. So the conventional solid windows have been becoming the threshold of the laser energy's promotion and the optical quality's improvements.
To solve the above-mentioned problem of HEL's output solid wind...