Colour centre Bragg grating recording in lithium fluoride thin layers

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Abstract

We study the recording of permanent Bragg gratings on surface-coloured Lithium Fluoride crystals by using the interference pattern of a CW UV Argon ion laser operating at 244 nm. Gratings with spatial periods ranging from 400 nm to 1000 nm are written by using a phase-mask interferometer. They are stable up to several months after the writing process. Absorption and photoluminescence spectra show the bleaching of primary F and F - aggregate colour centres as a result of the process. Confocal microscopy is used to determine the pitch and the profile of the fluorescent gratings. The UV-induced optical bleaching in densely coloured LiF layers is responsible for the periodic spatial modulation of absorption and photoemission properties that characterises the grating. In the coloured surface layer, a reduction up to 50% of the initial refractive index increase has been estimated in the bleached areas. © 2008 American Institute of Physics.
Original languageEnglish
DOIs
Publication statusPublished - 2008
Externally publishedYes
Event6th Ibero-American Conference onOptics and 9th Latin-American Meeting on Optics, Lasers and Applications, RIAO/OPTILAS 2007 - , Brazil
Duration: 1 Jan 2008 → …

Conference

Conference6th Ibero-American Conference onOptics and 9th Latin-American Meeting on Optics, Lasers and Applications, RIAO/OPTILAS 2007
CountryBrazil
Period1/1/08 → …

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Bonfigli, F., Vincenti, M. A., Almaviva, S., Montereali, R. M., Nichelatti, E., Kalinowski, H. J., & Nogueira, R. N. (2008). Colour centre Bragg grating recording in lithium fluoride thin layers. Paper presented at 6th Ibero-American Conference onOptics and 9th Latin-American Meeting on Optics, Lasers and Applications, RIAO/OPTILAS 2007, Brazil. https://doi.org/10.1063/1.2926957