Beam shape sensitivity of spatial scanning

John A. Hermann

doi:10.1117/12.138068

18 August 1992 Beam shape sensitivity of spatial scanning

John A. Hermann

Proceedings Volume 1692, Nonlinear and Electro-Optic Materials for Optical Switching; (1992) https://doi.org/10.1117/12.138068
Event: Aerospace Sensing, 1992, Orlando, FL, United States

Abstract

The effects of optical beam shape variations upon the near- field transmission features of a thin nonlinear medium located at a beam waist have been investigated. This work is particularly relevant to the z- scan techniques, as well as to the aperture -scan techniques, for characterising nonlinear media. In the model that has been explored, a family of incident transverse beam shapes F(p,v) characterised by a shape parameter v has been introduced at the focusing lens. For v <2, these transform to a diffraction pattern containing circular rings and expressible in terms of an ordinary Bessel function. For v < 2 there is only a central spot, expressible in terms of a modified Bessel function. The functions F(p ,v) conserve both the incident peak irradiance and the beam power as V changes. A simple cubic (Kerr) nonlinearity has been studied. It is shown that a basic trade-off exists between the width and height of the peak-valley separation in the normalised transmission curve.

Citation Download Citation

John A. Hermann "Beam shape sensitivity of spatial scanning", Proc. SPIE 1692, Nonlinear and Electro-Optic Materials for Optical Switching, (18 August 1992); https://doi.org/10.1117/12.138068

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