Abstract
The strong confinement of light in planar optical waveguides can be exploited to obtain the high irradiance-length products necessary for nonlinear optical processes to be observed with relatively low incident powers. However, at these high power densities, two-photon absorption (TPA) becomes important and may restrict or inhibit the usefulness of a material or device. We report here waveguide measurements of the TPA coefficient and nonlinear refractive index of Poly 4-BCMU in its amorphous thin-film form. In the analysis, linear and nonlinear absorption, nonlinear refraction, and beam diffraction are all taken into account.
© 1991 Optical Society of America
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