Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1993-08-23
1994-06-28
Bovernick, Rodney B.
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359297, 359614, 372 11, G02B 523
Patent
active
053252276
ABSTRACT:
The present invention provides protection from lasers with a high nonlinear bsorption structure including a mirror which directs an incident beam to a beam splitter. A focusing lens receives and focuses the radiation to a higher intensity beam which is directed into an absorption material with a third order polarization property. Such materials will cause a two-photon absorption partial attenuation from the intensified beam when the incident radiation intensity is greater than ambient intensity. A focusing mirror receives the partially attenuated beam and reflects and refocuses the partially attenuated beam back through the absorption material, which now acts as a single photon absorption material to further attenuate the beam. The doubly attenuated beam passes through the focusing lens which recollimates the doubly attenuated beam and directs it to the beam splitter which in turn directs the beam to the receiving device. A normal intensity beam will not activate the absorption mechanism of the absorption material and will pass through the system essentially unaffected.
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Chen C. H.
Garrett W. R.
Payne M. G.
Templeton Douglas W.
Bovernick Rodney B.
Sanghavi Hemang
Soderling Gail S.
Taucher Peter A.
The United States of America as represented by the Secretary of
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