Patent ID: 6411451
Filing Date: 2002-06-25
Classification: G01J,G02B

Abstract:
An optical system for protecting the eye of an observer against a beam of laser radiation of selected wavelength projected along a light path by a source of radiant energy, said optical device comprising:first filtering means positioned on said light path facing said source for partially absorbing laser radiation from said source and incident visible light so as to reduce reflected illuminance from said optical system thereby allowing said observer to avoid detection; second filtering means positioned downstream from said first filtering means on said light path for passing only visible light within a selected passband and reflecting therefrom laser radiation from said source thereby protecting the eye of said observer; and image intensifier means positioned downstream from said second filtering means on said light path for amplifying visible light passing through said second filtering means so as to form a visual image which may be viewed by said observer; said image intensifier means comprising a photocathode positioned on said light path facing said second filtering means, a phosphor screen positioned on said light path facing said eye and a microchannel plate positioned on said light path between said photocathode and said phosphor screen.