Far infrared tandem low energy optical power limiter device

Optical waveguides – Planar optical waveguide – Thin film optical waveguide

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Reexamination Certificate

active

07566695

ABSTRACT:
Two embodiments of a multilayered low energy optical power limiter device are disclosed which protect thermal sensors against laser threats in the far infrared spectral region. One limiter device has multiple layers in order from the incoming radiation side an antireflective coating layer, a window substrate layer, a layer of chalcogenide, a germanium substrate layer, a layer of vanadium dioxide (VO2), a window substrate, and an antireflective coating layer. As incoming radiation energy increases, the VO2layer will heat up and change from an unswitched transmissive state to a switched reflective state. The excessive energy past the switched state is reflected back through the germanium and chalcogenide layer and is absorbed quickly therein so that these layers also heat up quickly and are switched almost simultaneously with the VO2layer to provide high optical density at a low switching threshold temperature with high damage threshold. The second embodiment further adds a second VO2layer between the input antireflective coating layer and window substrate layers to reflect high radiation energy immediately.

REFERENCES:
patent: 3267807 (1966-08-01), Swope et al.
patent: 3484722 (1969-12-01), Barker et al.
patent: 3714430 (1973-01-01), Finvold et al.
patent: 3790250 (1974-02-01), Mitchell et al.
patent: 4283113 (1981-08-01), Eden
patent: 4401690 (1983-08-01), Greenberg
patent: 4524385 (1985-06-01), Billingsley et al.
patent: 4545641 (1985-10-01), Sobey

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Far infrared tandem low energy optical power limiter device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Far infrared tandem low energy optical power limiter device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Far infrared tandem low energy optical power limiter device will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3858490

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.