Optical: systems and elements – Absorption filter
Patent
1991-10-11
1992-12-22
Moskowitz, Nelson
Optical: systems and elements
Absorption filter
359890, 351213, G02B 523, F21V 900, H01S 310
Patent
active
051738112
ABSTRACT:
An optical shield which is transparent to ambient light but which blocks high intensity light such as that from a laser, with a response speed on the order of several picoseconds or less, to provide eye protection and to protect light sensors from laser beams. The shield is a multilayer structure with layers in which colloidal silica particles are dispersed in a transparent polymer binder having an index of refraction close to that of the silica particles under ambient light conditions. The application of multiple sealant layers of pure binder material results in improved transmittance of ambient light. High intensity light such as that from a laser causes third order nonlinear optical effects, particularly photorefractive effects, in the silica which change its effective index of refraction so that the mismatch between the effective index of refraction of the silica and the index of refraction of the binder causes scattering of the incident light. The shield is effective over a broad radiation band including near infrared and ultraviolet portions of the spectrum as well as the entire visible light range.
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Thomas, I. M.; SPIE O-E Lase '88, L.A. Calif., Jan. 10, 1988, NTIS DE 88006230/XAB; abst. only supplied.
Gumbs Associates, Inc.
Lessler Arthur L.
Moskowitz Nelson
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