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Proceedings Paper

Mid-IR volumetric Bragg grating based on LiF color center crystals
Author(s): Anitha Arumugam; Anton V. Fedorov; Dmitry V. Martyshkin; Vladimir V. Fedorov; David J. Hilton; Sergey B. Mirov
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Paper Abstract

Currently, a majority of Volumetric Bragg gratings (VBG) use photorefractive glasses with a transmission band between 0.3 and 2.7 μm. We have proposed and realized VBGs for mid-IR spectral range based on LiF color center crystals (LiF:CC). γ-irradiated LiF:CC crystals feature strong absorption bands in the visible and near-IR spectral range, where selective color center photo-bleaching allows for the LiF refractive index modification. The absence of active absorption in LiF:CCs at wavelengths longer than 1.3 μm results in a VBG that is stable under mid-IR irradiation. Our calculations predict that ~60% diffraction efficiency over 1-6 μm spectral range could be realized in ~1 cm long VBG. To verify this calculation, we fabricated periodic structures in LiF:CC crystals with 24 and 12 μm spacings by CCs photo-bleaching using femtosecond Ti:sapphire laser pulses. Periodic structures exhibit diffraction in multiple orders in the Raman-Nath regime at 0.532, 0.632, and 1.56 μm. The first order diffraction efficiencies were stronger for a visible radiation due to a bigger refractive index variations and additional amplitude modulation. The demonstrated diffraction at 1.56 μm is a clear manifestation of a phase grating in LiF and serves as a proof of feasibility of these LiF:CC crystals for mid-IR VBG applications.

Paper Details

Date Published: 15 February 2012
PDF: 6 pages
Proc. SPIE 8235, Solid State Lasers XXI: Technology and Devices, 823521 (15 February 2012); doi: 10.1117/12.909347
Show Author Affiliations
Anitha Arumugam, The Univ. of Alabama at Birmingham (United States)
Anton V. Fedorov, The Univ. of Alabama at Birmingham (United States)
Dmitry V. Martyshkin, The Univ. of Alabama at Birmingham (United States)
Vladimir V. Fedorov, The Univ. of Alabama at Birmingham (United States)
David J. Hilton, The Univ. of Alabama at Birmingham (United States)
Sergey B. Mirov, The Univ. of Alabama at Birmingham (United States)


Published in SPIE Proceedings Vol. 8235:
Solid State Lasers XXI: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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