Abstract
It is challenging to cooperatively improve the nonlinear optical(NLO)efficiency and the laser-induced damage threshold(LIDT).This work reports a novel IR NLO materials CslnP2S7(CIPS)designed by combination the strategies of alkali metals substitution and microscopic NLO units PS4 introduction based on AgGaS2.CIPS was composed of strongly distorted[InS6]9-octahedra and[P2S7]4-dimers con-structed by corner-sharing[PS4]3-,which increase the NLO efficiency and decrease thermal expansion anisotropy simultaneously.Compared with AgGaS2,CIPS exhibited strong phase matchable NLO response ca.1.1 × AGS@2.1 μm,high LIDT ca.20.8×AgGaS2,and IR transparency up to 15.3 μm.Structural analysis and theoretical investigation confirmed that large SHG effect and ultrahigh LIDT of CIPS originated from the synergistic contribution of[InS6]9-octahedra and[P2S7]4-dimers.These results indicate that CIPS is a promising NLO candidate in the mid-IR region,and this study provides a new approach for developing potential NLO-LIDT compatible materials.
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