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All-optical OBS and interferometer setup: P, polarizer; HWP, half-wave plate; SRM, semireflective mirror; , interference angle; PM, piezomirror; PD, photodetector; L, lens.
(a) Reversible and repeatable changes of the azo-POLICRYPS diffraction efficiency induced by a pump green light. Power density values are reported in the figure. (b) Typical intensity profile of the transmitted intensity trough the structure.
Intensity profile of the interference pattern vs the piezomirror position. A reversible change of oscillation amplitude, obtained by switching ON and OFF the external pump can be well observed.
Beam splitting (a) and fringe visibility (b) vs the pump power density. Interference pattern acquired with a CCD camera is reported for (1) and (2). Experimental errors are the order of dot and cross dimensions.
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