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Spodumene, α-LiAlSi2O6 – A new natural SRS-active crystal with three χ(3)-promoting vibrational modes

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Abstract α-LiAlSi2O6, known as mineral spodumene, is introduced as a novel SRS-active crystal with monoclinic symmetry C2/c. Under picosecond laser excitation Raman-induced steady-state χ(3)-nonlinear generation in the visible and near-IR… Click to show full abstract

Abstract α-LiAlSi2O6, known as mineral spodumene, is introduced as a novel SRS-active crystal with monoclinic symmetry C2/c. Under picosecond laser excitation Raman-induced steady-state χ(3)-nonlinear generation in the visible and near-IR is observed in the crystals. All recorded Stokes and anti-Stokes high-order lasing components are identified and correspond to three SRS-promoting phonon modes with ωSRS1 ≈ 709 cm−1, ωSRS2 ≈ 357 cm−1 and ωSRS3 ≈ 1074 cm−1. On the basis of the results of a spontaneous Raman scattering study they were assigned to vibrations of the tetrahedral [SiO4] groups of the silicate chains and lattice modes of Li-O or Al-O of the crystal structure. A brief review in tabular form of so far known SRS-active natural crystals (minerals) is given as well.

Keywords: active crystal; new natural; srs active; spodumene lialsi2o6; lialsi2o6 new

Journal Title: Optical Materials
Year Published: 2018

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