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Methods for the measurement of the waist size and position for Gaussian beams are summarized. An alternative method is given which would apply to pulsed systems. The general theory of diffraction of Gaussian beams is developed which provides a new method for the location of the beam waist. These methods which use hole gratings are employed to demonstrate their feasibility using a small cw source.
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Herman et al. (1985) studied this question.
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