Abstract
A wide range of nonlinear optical coefficients and various systems of notation have been used to describe optical second-harmonic generation (SHG). To avoid possible confusion, the techniques of optical nonlinear coefficient measurement and the elementary theory of SHG are briefly reviewed. Absolute and relative nonlinear coefficient measurements by phase-matched SHG are described. The following results were obtained: d36(KDP) equals 0.38 pm/V, d36(KD*P) equals 0.37 pm/V, d22(BaB2O4) equals 2.2 pm/V, d31(LiIO3) equals -4.1 pm/V, d31(5%MgO:LiNbO3) equals -4.7 pm/V, d15(KTP) equals 1.9 pm/V and d24(KTP) equals 3.5 pm/V. The accuracy of these measurements is estimated to be better than 10%. An example of high-repetition-rate pulsed SHG in AgGaSe2 is given to demonstrate the use of quantitative analysis of harmonic generation for evaluation of nonlinear optical material performance.
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