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Issue 11, 2018
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Design and synthesis of a nonlinear optical material BaAl4S7 with a wide band gap inspired from SrB4O7

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Abstract

The most convenient method to generate mid-infrared (mid-IR) high-power lasers is through nonlinear optical (NLO) process using NLO materials with high laser damage threshold (LDT). The LDT is intrinsically dependent on the energy band gap, but often inverse of the NLO effect. Therefore, achieving a good balance between band gap (Eg > 3.0 eV) and NLO response (dij > 10 × KDP) in a good mid-IR NLO material is necessary. In this study, inspired by the oxide SrB4O7 with the highest LDT among all known borate crystals, we propose that the chalcogenide BaAl4S7 with similar crystal structure may have attractive NLO properties. The experiments revealed that BaAl4S7 possesses the broadest band gap (>3.95 eV) among all known mid-IR NLO chalcogenides, and its LDT is above 10 times that of the commercial material AgGaS2. Moreover, its NLO coefficient is above 10 × KDP (half of that of AgGaS2). All these features demonstrate that BaAl4S7 is a potential candidate as a good mid-IR NLO material.

Graphical abstract: Design and synthesis of a nonlinear optical material BaAl4S7 with a wide band gap inspired from SrB4O7

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Publication details

The article was received on 12 Dec 2017, accepted on 14 Feb 2018 and first published on 14 Feb 2018


Article type: Communication
DOI: 10.1039/C7TC05693A
Citation: J. Mater. Chem. C, 2018,6, 2684-2689
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    Design and synthesis of a nonlinear optical material BaAl4S7 with a wide band gap inspired from SrB4O7

    D. Mei, J. Jiang, F. Liang, S. Zhang, Y. Wu, C. Sun, D. Xue and Z. Lin, J. Mater. Chem. C, 2018, 6, 2684
    DOI: 10.1039/C7TC05693A

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