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Fig. 6 | Journal of the European Optical Society-Rapid Publications

Fig. 6

From: Coaxial superposition of Bessel beams by discretized spiral axicons

Fig. 6

Calculated transversal phase gradient in Cartesian coordinates at z=18 mm (left column) or (a)+(c) \(\frac {\partial \phi (x,y)}{\partial x}\); (right column) or (b)+(d) \(\frac {\partial \phi (x,y)}{\partial y}\); (top row) or (a)+(b) on-axis vortex; (bottom row) or (c)+(d) off-axis vortex. The value of the gradient is limited to ±5×105 for a better overview. The solid curves represent lines of zero gradient on the x-axis (y-axis) for the x- (y-) component of the gradient. The dashed lines indicate maximum/minimum of the lobes of the corresponding gradient distribution

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