FRUSTRATED TOTAL INTERNAL REFLECTION OPTICAL POWER LIMITER
Assignee
US Government
Filed as: UNITED STATES OF AMERICA, THE, AS REPRESENTED BY THE SECRETARY OF THE ARMY
Filed
Sep 5, 1984
Granted
Oct 1, 1996
Location
FORT WASHINGTON MD US
Abstract
In order to protect a delicate photodetector from high-intensity radiation, such as from a laser, a device for limiting optical power to the detector is interposed between the radiation and the detector. This device has an optical interface that totally reflects high-intensity radiation, but which freely transmits normal (low intensity) radiation to the detector. The interface is between two optical materials, one with a linear index of refraction with respect to radiation intensity, and the other with a non-linear index. At low intensity radiation levels, the two materials have the same indices of refraction, and such radiation is freely transmitted through the interface, but with high-intensity radiation, a mismatch of indices of refraction allows total reflection at the interface.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Mar 18, 1987
Rescinded
Dec 17, 1993
Duration
6 years, 9 months
Inventor
- 1EDWARD J. SHARP
Record Details
- Patent number
- US 5561541
- Application
- 00664814
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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