Mid-IR volumetric Bragg grating based on LiF color center crystal

Academic Article

Abstract

  • We have demonstrated volumetric Bragg gratings (VBGs) for mid-IR spectral range based on LiF color center (LiF:CC) crystals. 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:CC crystals at wavelengths longer than 1.3 μm results in a VBG that is stable under mid-IR irradiation. Our calculations predict a ~60% diffraction efficiency over 1-6 μm spectral range, which could be realized in a ~1 cm long VBG. To verify this, we fabricated periodic structures in LiF:CC crystals using an amplified femtosecond Ti:sapphire laser. Diffraction at 1.56 μm is demonstration of a phase grating in LiF and is a proof of the feasibility of LiF:CC crystals for mid-IR VBG applications. © 2012 Optical Society of America.
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    Digital Object Identifier (doi)

    Author List

  • Martyshkin DV; Fedorov AV; Arumugam A; Hilton DJ; Fedorov VV; Mirov SB
  • Start Page

  • 1209
  • End Page

  • 1218
  • Volume

  • 2
  • Issue

  • 9