Plural pass vision system

Details Plural pass vision system Plural pass vision system

1993-05-20

1994-09-06

Ben, Loha

Optical: systems and elements

Absorption filter

351213, 359600, 359853, 359894, G02B 522

Patent

active

053453409

ABSTRACT:
Disclosed herein is an optical system which allows light below a given flce to pass but which blocks light above the given fluence so that a human viewer using the system is not harmed by high energy lasers directed at the system. The optical system concentrates incoming light at a first focal zone in a NLASM, or nonlinear absorbing or scattering material. During a time delay, the system reconcentrates the light at a second focal zone to which the plasma zone has had time to expand. The character and number of light concentrations in the NLASM can be varied to protect the human viewer from a wider range of harmful light fluences.

REFERENCES:
patent: 3620597 (1971-11-01), Schartz
patent: 5220463 (1993-06-01), Edelstein et al.
patent: 5283697 (1994-02-01), Tutt et al.

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