Patent ID: 6028723
Filing Date: 2000-02-22
Classification: A61F,B23K,G02B

Abstract:
A lens system for protecting high gain optical systems from damage due to high intensity laser radiation, comprising:a tubular case;an exit lens disposed in a first end of said tubular case;an entry lens disposed in a second end of said case opposite to said first end, said case, said entry lens and said exit lens forming a closed volume, an external surface of said entry lens having a convex radius of curvature so as to focus incoming radiation onto a spot, an internal surface of said entry lens having a half-silvered concave radius of curvature forming a first mirror which collimates radiation directed thereto from said spot and directs said collimated radiation through said exit lens;a convex second mirror disposed at said spot; anda medium disposed in said closed volume having an index of refraction substantially the same as that of said entry lens and containing aerosol particles, whereby laser radiation is focused in said volume to vaporize at least some of said particles.