Nonlinear refraction and absorption in 4BCMU planar waveguides at 1.064 μm wavelength

Abstract We have measured the nonlinear refractive index, n 2, and two-photon absorption coefficient, β, in 4BCMU planar waveguides at 1·064 μm wavelength using picosecond pulses. We use a beam propagation code, with n 2 and β as fitting parameters, to make numerical comparison with the experimental data. Deduced values from this analysis are n2 = − 1·5 × 10−13 cm2W−1, confirming the negative sign of the nonlinearity at this wavelength, and β = 0·01 cm MW−1.