Adaptive generation of Bessel-like beams by reflective multi-electrode piezo-axicons

The authors report on first experimental results obtained with a new type of tunable mechanical axicon mirror. Its design is based on a piezo-disk with 5 concentric circular electrodes (Ag) and a broadband reflecting aluminium layer on top. The local bending radii of the disk correspond to the voltages at the individual electrodes (<; 60 V). The envelope phase function was approximated by automated FEM simulations. Beam propagation of shaped ultrashort pulses was simulated with VirtualLab (Light Trans). Supporting structures and the substrate for the mirror were fabricated from Si wafers coated with polydimethylsiloxane (PDMS) and aluminium, respectively.