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Coherent bisection of optical frequency intervals as large as 530 THz

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Abstract

We demonstrate the coherent bisection of a 530-THz frequency interval between two lasers by phase locking a third laser to the midfrequency point of the first two by using the nonlinear phase-locking scheme. This is done by comparing the sum frequency of the first two lasers with the second harmonic of the third laser. We also examine the properties of such a frequency divider for the important practical case of a few-terahertz intervals in the 850-nm diode-laser regime.

© 1992 Optical Society of America

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