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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 31 — Nov. 1, 2009
  • pp: G38–G43

Photo-induced gratings in thin color center layers on lithium fluoride

Francesca Bonfigli, Maria Aurora Vincenti, Salvatore Almaviva, Rosa Maria Montereali, Enrico Nichelatti, Rogério N. Nogueira, and Hypolito José Kalinowski  »View Author Affiliations

Applied Optics, Vol. 48, Issue 31, pp. G38-G43 (2009)

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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 1000 nm 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.

© 2009 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(140.1700) Lasers and laser optics : Color center lasers
(140.3380) Lasers and laser optics : Laser materials
(230.4000) Optical devices : Microstructure fabrication

Original Manuscript: April 2, 2009
Revised Manuscript: June 25, 2009
Manuscript Accepted: July 10, 2009
Published: July 22, 2009

Francesca Bonfigli, Maria Aurora Vincenti, Salvatore Almaviva, Rosa Maria Montereali, Enrico Nichelatti, Rogério N. Nogueira, and Hypolito José Kalinowski, "Photo-induced gratings in thin color center layers on lithium fluoride," Appl. Opt. 48, G38-G43 (2009)

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