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The IPM in nonparaxial CV beams. (A) Geometry for analyzing the focusing property of CV beams. (B) Calculated fields (λ = 1.064 μm) focused with NA = 1.26, for different polarization parameter α. The refractive index of the ambient medium in image space is assumed to be nmed = 1.33 (water). Red circles with radius of 5.5 μm indicate the positions of local minima (min) between intensity maxima (max).
