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

1998; Optica Publishing Group; Volume: 15; Issue: 8 Linguagem: Inglês

10.1364/josab.15.002298

1520-8540

Russell J. Gehr, Arlee V. Smith,

Advanced Fiber Laser Technologies

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.