LASER DISCRIMINATION DEVICE
Assignee
AMERICAN OPTICAL CORPORATION, A CORP. OF DE
Filed
Jan 15, 1991
Granted
Dec 21, 1993
Location
NORTH PROVIDENC RI US
Abstract
A laser discrimination filter based on temporal coherence is presented. This filter comprises a multilayer device with "thick" layers such that the optical thickness of each layer is greater than the coherence length of the ambient light, but still much smaller than the coherence length of the laser light of interest. Thus, the spectral response of the device of this invention becomes dependent on the degree of temporal coherence of the incident light. If white light strikes the filter, multi-beam interference will not occur because of its short coherence length. The device acts like a stack of partially reflecting mirrors. If the laser light strikes the filter, multi-beam interference will still take place because of the long coherence length of the laser light. This causes the device to have different transmitting characteristics for laser light and white light. Therefore, this device functions as a laser discrimination device.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Apr 6, 1992
Rescinded
May 26, 1993
Duration
1 year, 1 month
Inventor
- 1XIAOHUI NING
Record Details
- Patent number
- US 5272332
- Application
- 00764165
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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