Precise estimation of nonlinear-optical coefficients for anisotropic nonlinear films with C_∞V symmetry

Abstract

An extended theory of Maker fringes, applicable to extraordinary waves, is presented for the exact estimation of nonlinear-optical coefficients d₃₁ and d₃₃ of anisotropic films with C_∞υ symmetry, such as poled and Langmuir-Blodgett films. Numerical data show that, while the value of d₃₁ decreases with increasing anisotropy of the refractive index at the harmonic frequency, the value of d₃₃ increases remarkably. Therefore, if anisotropy of a few percent is neglected, as in conventional estimations, the values of d₃₁ and d₃₃ are overestimated and underestimated, respectively, and large errors occur. Moreover, d₃₃ strongly depends on the anisotropy at the fundamental frequency.

© 1992 Optical Society of America

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