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Separated-beam nonphase-matched second-harmonic method of characterizing nonlinear optical crystals

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Abstract

We demonstrate a variation of the wedge method of Maker-fringe measurement in which the fundamental beam diameter is large enough to contain several second-harmonic coherence fringes. In the far field the second harmonic forms spatially separated beams from which both Δks and deffs can be deduced on a single laser pulse. Analysis is simple because no fringe analysis is required and because the method is immune to multiple surface reflections, birefringent walk-off, group-velocity walk-off, and surface effects such as longitudinal polarization. Example measurements on KDP and LiIO3 are presented.

© 1998 Optical Society of America

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