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PbGa2MSe6 (M = Si, Ge): Two Exceptional Infrared Nonlinear Optical Crystals
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2015 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 27, no 3, 914-922 p.Article in journal (Refereed) Published
Abstract [en]

Two noncentrosymmetric (NCS) quaternary selenides, PbGa2SiSe6 (<bold>1</bold>) and PbGa2GeSe6 (<bold>2</bold>), with second-order nonlinear optical (NLO) responses, were synthesized by a conventional high-temperature solid-state reaction method. Compounds <bold>1</bold> and <bold>2</bold> are constructed by three NCS chromophores, [PbSe4], [GaSe4], and [Ga/SiSe4] or [Ga/GeSe4], with the covalent interactions between the X and Se atoms (X = Pb, Ga, Ga/Si, or Ga/Ge). They crystallize in the polar space groups Cc and Fdd2, respectively. Inspiringly, compound <bold>2</bold> is phase-matchable (PM) and shows high laser-induced damage threshold (LIDT) of 3.7 x AgGaS2 and wide transparent region (0.6325 mu m) in the mid-infrared (MIR) region. Most importantly, it presents extraordinary strong second harmonic generation (SHG) at 2.05 mu m radiation of about 12 x AgGaS2 at the particle size of 2545 mu m, which represents the strongest SHG among PM chalcogenides to date. The calculated major SHG tensor elements of compounds <bold>1</bold> and <bold>2</bold> are d31 = 224.7 and d12 = 222.1 pm/V, respectively, while the calculated d36 of AgGaS2 is only 21.2 pm/V.

Place, publisher, year, edition, pages
2015. Vol. 27, no 3, 914-922 p.
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Chemical Sciences
URN: urn:nbn:se:su:diva-115926DOI: 10.1021/cm504195xISI: 000349934500030OAI: diva2:805986


Available from: 2015-04-17 Created: 2015-04-08 Last updated: 2015-04-17Bibliographically approved

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Chen, Hong
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Department of Materials and Environmental Chemistry (MMK)
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