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Active optical limiting semiconductor device and method with active region transparent to light becoming opaque when not biased

Patent image
CCDC ARL

An optical switching system comprising an embodiment with a high pass filter operable to eliminate a portion of frequencies present in an image and an optical device operative to receive the spectrally modified image from the high pass filter, alternatively amplify the spectrally modified image, and propagate at least those frequency components in the spectrally modified image exhibiting a frequency less than an absorption frequency of the optical switching device when the optical switching device is active. Alternatively, the optical switching system may transmit an image only when the system is active. The optical switching system may, for example, comprise superluminescent light emitting diodes which may be, for example, formed in the shape of an inverted truncated prism. For human viewing purposes, the operative transmission ranges may closely coincide with the maximum sensitivity of the photopic response of the corresponding red, blue and green cones in human eyes.

Inventors: 
Hoffman, Robert C.
Patent Number: 
Technical domain: 
Materials and Coatings
FIle Date: 
2008-10-27
Grant Date: 
2015-06-09
Grant time: 
2,416 days
Grant time percentile rank: 
44
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY