A new method of efficient sum-frequency generation for broadband input fields is theoretically analyzed and experimentally demonstrated. The method involves using an arrangement with two or more nonlinear mixing crystals, with a time-delay line situated between the crystals, for one of the fundamental fields relative to the other. The delay line temporally shifts the fundamental fields, one relative to another, by a time longer than their coherence time. The improvement in efficiency for sum-frequency generation using this method is much higher than for difference-frequency generation.
© 1993 Optical Society of America
Original Manuscript: September 8, 1992
Published: March 1, 1993
C. Radzewicz, J. S. Krasinski, and Y. B. Band, "Increased efficiency for sum-frequency generation for broadband input fields," Opt. Lett. 18, 331-333 (1993)