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Laser microphone

United States Patent

November 14, 2000
View the Complete Patent at the US Patent & Trademark Office
Brookhaven National Laboratory - Visit the Office of Technology Commercialization and Partnerships Website
A microphone for detecting sound pressure waves includes a laser resonator having a laser gain material aligned coaxially between a pair of first and second mirrors for producing a laser beam. A reference cell is disposed between the laser material and one of the mirrors for transmitting a reference portion of the laser beam between the mirrors. A sensing cell is disposed between the laser material and one of the mirrors, and is laterally displaced from the reference cell for transmitting a signal portion of the laser beam, with the sensing cell being open for receiving the sound waves. A photodetector is disposed in optical communication with the first mirror for receiving the laser beam, and produces an acoustic signal therefrom for the sound waves.
Veligdan; James T. (Manorville, NY)
Brookhaven Science Associates (Upton, NY), Brookhaven National Laboratory (Upton, NY)
08/ 989,275
December 12, 1997
This invention was made with Government support under contract number DE-AC02-76CH00016, awarded by the U.S. Department of Energy. The Government has certain rights in the invention.