and applied the two channels to the respective panel. We have performed calibration measurements to ensure that both the amplitude and phase modulation exhibited a linear dependence on the applied 8-bit color value between 0 and 255. A CCD camera allowed us to record images of laser fields in the Fourier plane of lens 5.

![Experimental setup. FP = focal plane, L = Lens. Focal widths: $f_{1}=50~\textrm{mm}$, $f_{2}=500~\textrm{mm}$, $f_{3}=f_{4}=400~\textrm{mm}$, $f_{5}=1~\textrm{m}$. Laser: JDS Uniphase HeNe laser, $P_{\max}=10~\textrm{mW}$, $\lambda=633~\textrm{nm}$, SLM: Holoeye HEO 1080 P dual display system, $\textrm{resolution}=1920~\textrm{pixel}\times1080~\textrm{pixel}$, $\textrm{display size}=1~\textrm{in}\times0.7~\textrm{in}$. CCD camera: Basler pilot piA640-210gm, $\textrm{resolution}=648~\textrm{pixel}\times488~\textrm{pixel}$, $\textrm{pixel size}=7.4~\upmu\textrm{m}\times7.4~\upmu\textrm{m}$.[]{data-label="fig:setup"}](MaziluFig9.pdf){width="85.00000%"}

The experiment consist in determining the OEi in the CCD camera plane whilst shaping and superimposing the test fields $E_{j}$ in the SLM planes. In the following, we indicate the plane of interest by a $z$-coordinate along the optical axis where $z=z_{1}$ and $z=z_{2}$ refer to the SLM and CCD camera plane, respectively. According to this convention we shape a set of test fields $E_{j}(z_{1})=A_{j}(z_{1})e^{i\phi_{j}(z_{1})}$ both in amplitude $A_{j}$ and phase $\phi_{j}$ in the SLM plane, and the associated intensities $I_{j}(z_{2})\propto|E_{j}(z_{2})|^{2}$ are detected in the CCD camera plane. The amplitudes $A_{j}(z_{2})$ were determined from these intensities by simply taking the square root. We used 