Growth and characterization of single crystals of ternary chalcogenides for laser applications

Ludmila Isaenko, Alexander Yelisseyev, Jean Jacques Zondy, Guido Knippels, I. Thenot, Sergei Lobanov

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Bulk single crystals up to 20 mm in diameter and 40 mm long for LiInS2 and up to 10 mm, 20 mm, respectively, for LiInSe2 have been grown. Their color changed from colorless to rose for the first one and from yellow to dark red for the other. All crystals have wurtzite-type lattice (Pna21 space group), lattice parameters were determined. A band gap was found to be 3.72 and 3.57 eV for LiInS2 and 3.02, 2.86 eV for LiInSe2 at 80 and 300K respectively. Color variations are due to point defects, first of all to interstitial sulfur, resulting in additional wide absorption bands in the shortwave part of transparency range. For LiInS2 the SHG phase matching conditions were found to be similar for samples of different color and some difference from Boyd's predictions of 1973 was shown: for XY plane Δφ∼ +3° at 2.6 μm and Δφ∼ -3 to -5° at at 4÷5μm. Nonlinear susceptibility for LiInS2 was estimated: deff(XY)~3.4pm/V relative to Boyd’s value as 10.6 pm/V. A proper illumination gives a photoinduced change of LiInSe2 color from dark red to yellow as a result of changes in point defects charge state.

Original languageEnglish
Pages (from-to)342-350
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4412
Issue number1
DOIs
Publication statusPublished - Aug 10 2001

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Keywords

  • Absorption
  • Band gap
  • Color
  • Lattice parameters
  • Lithium indium sulfide/selenide
  • Nonlinear susceptibility

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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