Abstract
We describe an apparatus for measuring the second-order nonlinear tensor of crystals based on the measurement technique of separated-beam, nonphase matched, second-harmonic generation. This method is an improvement over traditional methods based on the analysis of Maker fringes. We illustrate our measurement technique and show some typical data for crystals of potassium dihydrogen phosphate and potassium niobate. We intend to maintain our apparatus to encourage rapid and complete characterization of new nonlinear crystals, and also to improve the nonlinear tensor data base for established nonlinear crystals.
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