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
Original Manuscript: January 22, 1992
Revised Manuscript: April 20, 1992
Published: November 1, 1992
Naomichi Okamoto, Yasuhiko Hirano, and Okihiro Sugihara, "Precise estimation of nonlinear-optical coefficients for anisotropic nonlinear films with C∞V symmetry," J. Opt. Soc. Am. B 9, 2083-2087 (1992)