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The focal switch of astigmatic Hermite–Gaussian (H–G) beams passing through a system with the aperture and lens separated is studied. Closed-form expressions for the axial irradiance of focused astigmatic H–G beams are derived based on the Collins formula and recurrence relation. The influence of astigmatism on the behavior of the focal switch is stressed. It is found that the astigmatism affects...
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