Journal
APPLIED OPTICS
Volume 48, Issue 31, Pages G38-G43Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.48.000G38
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- National Council for Scientific and Technological Development (CNPq), Brazil
- Portuguese Foundation for Science and Technology (FCT), Portugal
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We study the recording of permanent Bragg gratings on surface-colored lithium fluoride (LiF) crystals by using the interference pattern of a continuous-wave UV argon-ion laser operating at 244 nm. Gratings with spatial periodicity ranging from 400 to 1000nm are written by using a phase-mask interferometer and are stable for several months after the writing process. Absorption and photoluminescence spectra show the bleaching of primary F and F -aggregate laser-active color centers as a result of the process. Confocal microscopy is used to determine the pitch and the profile of the fluorescent gratings. The UV laser-induced optical bleaching in highly colored LiF ultrathin layers is responsible for the periodic spatial modulation of absorption and photoemission properties that characterize the gratings. In the colored surface layer, a reduction of as much as 50% of the initial color-center-induced refractive-index increase has been estimated in the bleached areas. (C) 2009 Optical Society of America
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