Accurate Characterization of Free Carrier Refraction in InP
2010
Using recently published results of intrinsic and free carrier nonlinear absorption coefficients in InP, nonlinear
refraction was investigated at 1.064 μm using ns duration lasers to characterize refraction from generated free
carriers. A phase retrieval algorithm was implemented to determine the amplitude and phase profiles of the incident
beam. Accurate spatial and temporal profiles of the incident field were used to model nonlinear propagation
through and beyond the sample. With the sample held fixed at focus and the incident energy increased, images
of the transmitted beam a fixed distance away were recorded as a function of irradiance. Excellent agreement
was observed between recorded beam images and those generated from the numerical model.
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