The orientational distribution function of a poled, doped polymer film under stress is measured using polarized second-harmonic generation. The four interface nonlinear boundary conditions are solved, and both the magnitude of the second-order susceptibility and the ratio of the tensor components of the second-order susceptibility, X⁽²⁾₁₁₃/X⁽²⁾₃₃₃ (≡α), are shown to vary with poling field and stress. Further, the sign of the order parameter ratio, ‹P₃›/‹P₁›, as measured directly by polarized second-harmonic generation of these materials, shows that the materials fall into a regime of order unlike other material classes such as Langmuir—Blodgett films and liquid crystals. For a onedimensional dopant molecule, the order parameters ‹P₁›, ‹P₂›, ‹P₃›, and ‹P₄› can be estimated. Materials processed in this way are shown to result in a range of tensor ratios of α = 0.33 with a film under no stress to α = 0.7 with a film under moderate stress.

© 1989 Optical Society of America

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