Imaging performance degradation of optical bandpass filter damaged by scanning laser

摘要

Optical components in large aperture optical imaging system are susceptive to intense laser radiation. Optical bandpass filters for spectra selection, usually focal or near focal elements, are likely to be permanently damaged by high intense unwanted laser. In order to find the dependence of the optical imaging performance degradation on laser parameters and characteristics of the damage site, a test facility consisting of scaled electro-optical imaging system and standard imager evaluation system was constructed. Experiments were performed to obtain the linear spread function, modulation transfer function, signal transfer function, and noise power spectrum. The law of imaging performance degradation for damaged fused silica and colored glass filters was analyzed. In addition, brief discussions on the mechanisms of imaging performance degradation were also presented.