Monolithic optical power limiter based on two-photon absorption

Details Monolithic optical power limiter based on two-photon absorption Monolithic optical power limiter based on two-photon absorption

1988-06-21

1989-07-11

Laroche, Eugene R.

350363, 350381, 350390, G02B 523, G02F 101, G02F 129

Patent

active

048465615

ABSTRACT:
Collimated incident optical radiation which might contain high-intensity or igh-power radiation is focused into the body of a limiter by a first lens formed at one end of the limiter. The body is a cylinder of revolution with an axis along the optical axis between radiation and a sensitive detector. Radiation of normal intensity or power freely passes through the body and is recollimated by a second lens formed at the other end of the limiter from the first lens. The body is made of material which is subject to two-photon absorption such that high-intensity or high-power radiation undergoes absorption and is consequently self-defocused such that it is diverted from the optical path. For visible light, the material may be ZeSe or ZnS; for ultraviolet, copper chloride; for infrared, HgCgTe.

REFERENCES:
patent: 3395961 (1968-08-01), Ready
patent: 3790252 (1974-02-01), Pao
patent: 4410239 (1983-10-01), Kaplan et al.
patent: 4776677 (1988-10-01), Park et al.

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