Holographic recording with orthogonally polarized waves in centrosymmetric Na ₂ [Fe(CN) ₅ NO]·2H ₂ O

Abstract

Recording of holographic gratings by excitation of long-living metastable electronic states in centrosymmetric sodium nitroprusside can be performed with mutually orthogonal polarized waves. Two different cases have to be distinguished: 1) In a b-cut the optimum diffraction efficiency of 15% is achieved if the mutually orthogonal polarized writing waves form an angle of 45 • with respect to the aand c-axis. This, together with the fact that the polarization state is not changed in the diffraction process, indicates that the gratings originate from the presence of light-induced linear dichroism. 2) For a c-cut the polarization of the diffracted wave turns out to be orthogonal to the one of the incident beam. The efficiency of this so-called anisotropic diffraction reaches a maximum of up to 90% for waves mutually orthogonal polarized along the aand b-axis.

A Comprehensive Study of Photorefractive Properties in Poly(ethylene glycol) Dimethacrylate— Ionic Liquid Composites

“…The seed scatterers might be defects, imperfections and/or optical inhomogeneities within the medium. Therefore, light-induced scattering is a general phenomenon that occurs in virtually all media for which refractive-index changes occur when irradiated with a coherent beam [ 39 , 40 , 41 , 42 , 43 , 44 , 45 ]. The presence of these PGs hinders the applicability of elementary gratings by corrupting the optical quality of the system, e.g., by reducing the signal to noise ratio.…”

Specific Recording Kinetics as a General Property of Unconventional Photorefractive Media

“…Thus we classify them as unconventional photorefractive media. They can be characterized by the following criteria: occurrence of photorefraction in spite of their centrosymmetry so that a linear electro-optic effect is forbidden, a transient kinetics of the diffraction efficiency for recording with mutually parallel polarization, and the particular possibility to record holograms with orthogonally polarized waves [11,12].…”

Isomerization in Photochromic Ruthenium Sulfoxide Complexes

“…[27,28] These compounds and related complexes have found utility in photorefractive applications. [29][30][31][32][33] We have developed a class of simultaneously photochromic and electrochromic polypyridine ruthenium sulfoxide compounds. [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50] The mode of action is due to an intramolecular isomerization of the sulfoxide from S-bonded to O-bonded.…”