Title :
Polarized wave coupling and selection rules violation in alkali-halide crystals with FA centers
Author :
Baldacchini, Giuseppe ; Boiko, Sergei A. ; Francini, Roberto ; Grassano, Umberto M. ; Scacco, Augusto ; Shpak, Andrei M. ; Tarasov, Georgiy G.
Author_Institution :
Centro Ricerche Frascati, ENEA, Rome, Italy
fDate :
3/1/1998 12:00:00 AM
Abstract :
Self-diffraction of light has been investigated in KCl with FA centers in order to elucidate the role of FA-center kinetics in holographic recording under resonant optical excitation. It is shown that diffraction efficiency for holographic grating recorded in the spectral range of the FA1 transition can be substantially increased by populating the orientations which immediately interact with the polarized light by means of lateral illumination of the crystal with an auxiliary beam. The optimum range of auxiliary beam intensities leading to improvement of grating quality is found. Such a range is directly defined by the parameter χ, characterizing the selection rules violation for FA center in KCl. It has been found that the experimentally determined value χ=0.04 is consistent with the self-diffraction data obtained in this paper
Keywords :
F-centres; holographic gratings; holography; light diffraction; optical materials; potassium compounds; resonant states; A centers; FA1 transition; FA-center kinetics; KCl; alkali-halide crystals; auxiliary beam; auxiliary beam intensities; diffraction efficiency; grating quality; holographic grating; holographic recording; lateral illumination; polarized light; polarized wave coupling; resonant optical excitation; selection rules violation; self light diffraction; spectral range; Diffraction gratings; Holographic optical components; Holography; Kinetic theory; Kirchhoff´s Law; Lighting; Optical diffraction; Optical polarization; Optical recording; Resonance;
Journal_Title :
Quantum Electronics, IEEE Journal of
