Abstract
We develop a series of analytical approximations allowing for rapid extraction of the nonlinear parameters from beam deflection measurements. We then apply these approximations to the analysis of cadmium silicon phosphide and compare the results against previously published parameter extraction methods and find good agreement for typical experimental conditions.
Highlights
Knowledge of the temporal response of the Nonlinear Refraction (NLR) and Nonlinear Absorption (NLA) of materials is key for understanding of the physical mechanisms underlying the Nonlinear Optical (NLO) properties [1]
Various experimental techniques have been developed for measuring this response [2]. Used methods such as pump – probe [3, 4] provide the temporal response of the NLA, the refraction via the induced birefringence as in the Optical Kerr Effect (OKE) experiment [5] or with use of a local oscillator as with four wave mixing [6]
We have extended the analysis of Beam Deflection (BD) data to include depletion of the excitation due to linear absorption
Summary
Knowledge of the temporal response of the Nonlinear Refraction (NLR) and Nonlinear Absorption (NLA) of materials is key for understanding of the physical mechanisms underlying the Nonlinear Optical (NLO) properties [1]. Techniques for analyzing BD data for instantaneous and non-instantaneous nonlinearities in the presence of Group Velocity Mismatch (GVM) have been determined [8, 9] This method, is limited in that it only treats materials in the undepleted excitation approximation, where the absorption is sufficiently small so that irradiance throughout the sample is constant. This is a significant limitation, especially in probing 2-D, plasmonic and metamaterials which typically have high linear and nonlinear absorption [10, 11]. We apply our approximations to measurements of Cadmium Silicon Phosphide (CSP), a material with large index dispersion and linear absorption
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