The Board of Governors for Higher Education, State of Rhode Island and

Kenneth A Burbank

Otto J Gregory

A photoconductive sensor responsive to a CO.sub.2 laser beam. The sensor comprises a silver-doped germanium semiconductor. The silver dopant changes the conductive characteristics of the semiconductor which results in the doped germanium semiconductor being responsive to a wavelength range it would not normally be responsive to.

Doped-germanium sensor for use in a system to control the alignment of a

A thermoconductive sensor for aligning a laser beam which includes a substrate, a dielectric layer disposed on the substrate to provide electrical insulation, an insulating layer interposed between the dielectric layer and the substrate and a reflective/refractive material embedded in the layer to reflect heat from the layer and to conduct heat through a plurality of fingers. A plurality of serially connected thermocouples communicate with the fingers to provide an output of the changes and the thermoconductivity to then realign the laser beam.

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Coventry, RI, United States of America

Kenneth A Burbank