Abstract

A novel method of frequency division based on optical parametric oscillation is proposed. This scheme converts with high efficiency an input signal into two intense, coherent subharmonic outputs whose frequencies are tunable and whose linewidths are essentially limited by the input pump linewidth. By locking their difference frequency to a microwave, a millimeter-wave, or an infrared reference source, the output frequencies are precisely determined. The proposed frequency dividers can be operated in series or in parallel to measure, compare, and synthesize frequencies from optical to microwave. A line-narrowing effect for the generation of ultrastable radiation is discussed.

© 1990 Optical Society of America

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