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A. M.
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Paraxial Imaging: Gaussian beams versus paraxial spherical waves
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A. E. Siegman, Lasers (University Science Books, Mill Valley, CA, 1986). This book contains an in-depth description of the usefulness of viewing Gaussian beams as a complex source point on pages 637–641.
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See, for example, Yu. A. Kravstov, “Rays and caustics as physical objects,” in Progress in Optics, edited by E. Wolf (North-Holland, Amsterdam, 1988), Vol. 26, pp. 227–348, and references therein.
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