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Browse Prior Art Database

High Power Continuous Wave Laser Detector Array

IP.com Disclosure Number: IPCOM000082739D
Original Publication Date: 1975-Jan-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

von Gutfeld, RJ: AUTHOR

Abstract

A detector array has been devised that is capable of detecting very high power laser beams, i.e., 10/4/ watts/cm/2/, over an area of approximately 250 cm/2/, and is sufficiently rugged to be unaffected by such high power.

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High Power Continuous Wave Laser Detector Array

A detector array has been devised that is capable of detecting very high power laser beams, i.e., 10/4/ watts/cm/2/, over an area of approximately 250 cm/2/, and is sufficiently rugged to be unaffected by such high power.

The array 2 of detectors 4 (Fig. 1 is the front view and Fig. 2 is a sectional side view of the detector array) comprises a spherical aluminum or copper surface 6 that acts as a substrate. The diameter of the spherical substrate 6 is about 15 cm. The convex curvature of the substrate prevents incident radiation from scattering back to the source of radiation. A thin layer 8 (of the order of 100-1000 angstroms) of insulating material, such as aluminum oxide, acts as a good electrical insulator but a negligible thermal insulator, so as to electrically isolate the detectors 4 from the metal substrate 6. In between each detector 4 is a layer of plated silver 10.

Each of the individual metallic detectors 4 is approximately 100 X 200 microns and has a pair of silver leads 12 connected to each detector, which leads go to the periphery of the aluminum cylinder 6 and pass beneath a guard ring 14 to appropriate amplifiers, data processing equipment, etc., not shown. Such guard ring 14 protects the interconnections from overheating due to the incident radiation. The detectors 4 operate on the principle of transverse thermoelectric effect, wherein a temperature gradient is made to occur in a thin film by a las...