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Phase correction in double-pass quasi-phase-matched second-harmonic generation with a wedged crystal

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Abstract

Compensation for dispersive elements is necessary for efficient multiple-pass and intracavity nonlinear frequency-conversion devices. We describe the use of a wedged quasi-phase-matched crystal to compensate for the phase shifts introduced by mirrors in such devices, taking advantage of the periodic variation in the relative phases of the interacting waves in a quasi-phase-matching grating. A representative double-pass second-harmonic generation experiment with a 5-cm-long periodically poled lithium niobate crystal showed the expected conversion efficiency enhancement.

© 1998 Optical Society of America

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