Abstract
The optical holographic recording properties of the azo dye l-(2-Pyridylazo)-2-Naphthol in PMMA thin film were studied by using the three-dimensional forward degenerate four-wave mixing technique with a ps pulse laser at 532nm. It demonstrated that the transient grating turned into a permanent grating with the increase of the pulse energy and the grating can be erased through a thermal treatment of the film. The mechanism of the fixed grating was attributed to the trans–cis isomerization of the azo molecules induced by singlet excited-state absorption and the subsequent orientation of the molecules.
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