Laser attenuation device with sacrificial mirror

Details Laser attenuation device with sacrificial mirror Laser attenuation device with sacrificial mirror

1993-06-29

1994-03-01

LaRoche, Eugene R.

Optical: systems and elements

Mirror

With selective absorption or transparent overcoating

359297, 359359, G02B 1700, G02F 101

Patent

active

052913414

ABSTRACT:
An eye protection device for protection against a broad spectrum of incid high intensity radiation includes a beam splitter which transmits the radiation to a first focusing lens which in turn focuses the radiation on a first mirror. The first mirror has a sacrificial surface which desorbs if the radiation has a predetermined minimum intensity. A second lens receives radiation reflected from the first mirror and directs the beam orthogonally onto a second mirror. The beam reflects off the second mirror and is directed back through the second lens which refocuses the beam onto the surface of the first mirror at the original area. When the initial beam was above the minimum, reflectivity at this location will have been destroyed and the beam will pass harmlessly through the mirror. If the initial beam does not destroy the surface, the beam will be reflected back to the beam splitter and then to a receiving device.

REFERENCES:
patent: 3734592 (1973-05-01), Sztankay et al.
patent: 3982206 (1976-09-01), Poulsen
patent: 4719342 (1988-01-01), Cohn et al.
patent: 4917481 (1990-04-01), Koechner

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