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Focal shift of focused truncated Lorentz–Gauss beam

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Abstract

Based on the Collins diffraction integral formula and the complex Gaussian expansion of the aperture function, an analytical expression for a Lorentz–Gauss beam focused by an optical system with a thin lens and a circular aperture has been derived. The focal shift of the focused truncated Lorentz–Gauss beam is investigated with numerical examples, and the dependence of the focal shift on the different parameters of the focused truncated Lorentz–Gauss beam is discussed in detail. This research is useful to the applications of highly divergent laser beams.

© 2008 Optical Society of America

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