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 -long periodically poled lithium niobate crystal showed the expected
conversion efficiency enhancement.
© 1998 Optical Society of America
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