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Cavity-locked ring down spectroscopy

United States Patent

July 4, 2000
View the Complete Patent at the US Patent & Trademark Office
Distinct locking and sampling light beams are used in a cavity ring-down spectroscopy (CRDS) system to perform multiple ring-down measurements while the laser and ring-down cavity are continuously locked. The sampling and locking light beams have different frequencies, to ensure that the sampling and locking light are decoupled within the cavity. Preferably, the ring-down cavity is ring-shaped, the sampling light is s-polarized, and the locking light is p-polarized. Transmitted sampling light is used for ring-down measurements, while reflected locking light is used for locking in a Pound-Drever scheme.
Zare; Richard N. (Stanford, CA), Paldus; Barbara A. (Stanford, CA), Harb; Charles C. (Palo Alto, CA), Spence; Thomas (Union City, CA)
The Board of Trustees of the Leland Stanford Junior University (Palo Alto, CA)
09/ 061,080
April 15, 1998
U.S. GOVERNMENT RIGHTS This invention was made with U.S. Government support under grant Nos. DE-FG03-92ER14304 awarded by the Department of Energy, and AF-F49620-97-1-0316 awarded by the Office of Scientific Research of the Air Force. The U.S. Government has certain rights in this invention.