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Opto-electronic device for frequency standard generation and terahertz-range optical demodulation based on quantum interference

United States Patent

5,866,896
February 2, 1999
View the Complete Patent at the US Patent & Trademark Office
An opto-electronic system and technique for comparing laser frequencies with large frequency separations, establishing new frequency standards, and achieving phase-sensitive detection at ultra high frequencies. Light responsive materials with multiple energy levels suitable for multi-photon excitation are preferably used for nonlinear mixing via quantum interference of different excitation paths affecting a common energy level. Demodulation of a carrier with a demodulation frequency up to 100's THZ can be achieved for frequency comparison and phase-sensitive detection. A large number of materials can be used to cover a wide spectral range including the ultra violet, visible and near infrared regions. In particular, absolute frequency measurement in a spectrum from 1.25 .mu.m to 1.66 .mu.m for fiber optics can be accomplished with a nearly continuous frequency coverage.
Georgiades; Nikos P. (Pasadena, CA), Polzik; Eugene S. (H.o slashed.jbjerg, DK), Kimble; H. Jeff (LaCanada, CA)
California Institute of Technology (Pasadena, CA)
08/ 799,169
February 14, 1997
ORIGIN OF THE INVENTION The U.S. Government has certain rights in this invention pursuant to Grant No. DE-FG03-94ER14473 awarded by the Division of Chemical Science, Office of Basic Energy Science, Office of Energy Research, Department of Energy.