Knife-edge scanning of an astigmatic Gaussian beam

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Abstract
The relations for position, spot size, and inclination of the major axis of an elliptical Gaussian beam to knife-edge scanning data are derived. A knife-edge whose scanning direction is adjustable to any angle has been employed to scan across a beam in at least three directions. Nonlinear least-squares fit programs have been developed to check whether a beam is Gaussian, and to evaluate the parameters, with errors, of such an elliptic spot. The evolution of an astigmatic beam in the tangential and sagittal plane is measured.

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