Abstract
Diffraction gratings of weak efficiency (≈2−3%) were inscribed on thin films of the azobenzene p(DR1M) homopolymer using orthogonal linear (+45°,+135°) polarizations of two coherent laser beams. After an erasure process using a single beam of circular polarization (“RCP”), the surface relief profiles measured from atomic force microscopy (AFM) were compared on a grating inscribed during a short time period (≈200 s) and on similar gratings tentatively erased with a “RCP” irradiation during a short (100 s) or a long (800 s) period. In addition, confocal micro-Raman polarized experiments were performed on these gratings and, using a rigorous treatment of the Raman intensity variations, the two even parity Legendre'polynomials or parameter orders, 〈P2〉 and 〈P4〉, were estimated in the well, slope, and peak regions of the surface relief gratings; the corresponding forms of the most probable chromophore orientation distribution functions were determined. It is thus concluded that the variations in diffraction ef...
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