Hole-burning-induced spectral-spatial gratings in neutron-colored sapphire

Mark Aizengendler; Ivan Dolindo; Ilmo Sildos

doi:10.1117/12.22270

1 July 1990 Hole-burning-induced spectral-spatial gratings in neutron-colored sapphire

Mark Aizengendler, Ivan Dolindo, Ilmo Sildos

Proceedings Volume 1319, Optics in Complex Systems; (1990) https://doi.org/10.1117/12.22270
Event: 15th International Optics in Complex Systems, 1990, Garmisch, Germany

Abstract

Due to the birefringence of sapphire the 36O 450 rim phototransformation of the absorption spectrum of a neutron-coloured u-A12O3 leads to the persistent spatial modulation of defects concentration in both absorption bands. Spectral-spatial structures were detected by means of the luminescence of the photoproduct and by a direct observation the Bragg diffraction of light. After neutron irradiation and the subsequent thermal annealing of sappire one can find a number of polarized bands in its absorption spectrum. The aim of the present report is to study a persistent spectralspatial modulation in an optically anisotropic crystal neutronirradiated a-Al203 created by the 360* 450 nm laser phototransformation. Sapphire is a negative uniaxial crystal A fragment of the crystal structure and a model of anisotropic defects are shown in Fig. la. For photobleaching in the 360 nm absorption band a linearly polarized light with E''[OOOl] propagating in the direction k II [1210] was used. Due to birefringepce of sapphire this beam changes its polarization state periodically. The concentration of the defects in the 360 nm absorption band decreases due to the phototransformation of the defects and forms a periodical spatial structure. 0 100 200 r Fig. l. (a) A fragment of the a-A12O3 structure where d mdicates the arrangement of the anisotropic defect. On the left the direction of the laser beam for bleaching (or for exciting luminescence) is shown. In the upper part condition

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Mark Aizengendler, Ivan Dolindo, and Ilmo Sildos "Hole-burning-induced spectral-spatial gratings in neutron-colored sapphire", Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); https://doi.org/10.1117/12.22270

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