Fig. 4

(a) Schematic diagram of the experimental optical system. The single-mode fiber laser source, S, emits light at wavelength \(\lambda = {658}\,\text {nm}\). The polarizing beam splitter, PBS, is used to select the polarization of light along the LC director of the SLM. Lens L1 is used to collimate the beam, and Fourier lens L2 focuses the light onto the camera, C. (b) Compressed projection of the SLM plane onto the observation direction (other optical elements are omitted for clarity).