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 Δk’s and deff’s 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
Russell J. Gehr and A. V. Smith, "Separated-beam nonphase-matched second-harmonic method of characterizing nonlinear optical crystals," J. Opt. Soc. Am. B 15, 2298-2307 (1998)