Figure 1

Phase profile of the step-screw mixed phase dislocation (left) and structure of the corresponding computer-generated hologram (right).Reuse & Permissions

Figure 2

Experimental setup. B: Gaussian background beam illuminating the CGH. D: diaphragm selecting the first-order diffracted beam with the fractional vortex dipole. ${\text{L}}_1$ and ${\text{L}}_2$: lenses forming an inverted telescope; SBN: biased photorefractive crystal with marked orientation of the $c$ axis. Horizontal arrow: beam’s polarization. ${\text{L}}_3$ and CCD: imaging lens and charge-coupled device camera moving on a common translation stage to image the input or output facet of the crystal. The four virtual output channels are sketched in the plane of the CCD array.Reuse & Permissions

Figure 3

(Color online) Experimental (left) and numerically simulated (right) pump beam profiles $\left({\left|A_1\right|}^2\right)$ at the exit of the SBN crystal for deflection to the upper channel $U$ in Fig. 2. $\Delta \Phi =\pi$ and $2b=35\mu \text{m}$.Reuse & Permissions

Figure 4

Experimental results. Surface plots of the deflected signal beams at the exit of the SBN crystal for four different orientations of the CGH.Reuse & Permissions

Figure 5

(a) Sketch of the orientation of the CGH for addressing the four virtual output channels. (b) Composite image of all four deflected beams. The virtual output channels $\left(100\times 80\text{pix}\right)$ are marked with $L$ (left), $R$ (right), $U$ (up), and $D$ (down).Reuse & Permissions

Figure 6

Calculated intensity distributions $\left({\left|A_2\right|}^2\right)$ of the deflected probe beams at the exit of the crystal for $\Delta \Phi =\pi$ and $2b=35\mu \text{m}$. For better visibility, plot $L$ is scaled by a factor of 2.Reuse & Permissions