Characteristics of self-diffraction efficiency of ethyl orange polymer film

Abstract

Abstract:

When two coherent beams illuminate into the ethyl orange doped polymer film with small angle and equal intensity, the phenomena of self diffraction occur. We explored the dynamic characteristic of self-diffraction efficiency experimentally. The experiment results are the following: 1) The diffraction efficiency η increases monotonously from zero to a stable value ηs with the illumination time illuminated by lower intensity（I＝100mW/cm2）. 2) The diffraction efficiency η increases to a maximum ηm at first and then decreases to a stable value ηs illuminated by higher intensity. We analyzed the phenomenon theoretically by the model of population grating, which is formed by the molecules populations of trans and cis modulated by the coherence optical field. The theoretical results are consistent with the experimental results.

Key words: nonlinear optics, self-diffraction, model of population grating, ethyl orange

CLC Number:

O437

YANG Xiu-qin . Characteristics of self-diffraction efficiency of ethyl orange polymer film[J]. J4, 2011, 28(2): 178-182.

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