A new nonlinear optical crystal Li0.81Ag0.19InSe2 with balanced properties for efficient nonlinear conversion in the mid-IR region

The achievement of balanced properties among nonlinear optical (NLO) effect, laser induced damage threshold (LIDT) and optical birefringence is the key to obtain the excellent NLO crystals for harmonic mid-IR coherent radiation generation. In this work, we successfully synthesize and grow a new NLO...

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Bibliographic Details
Published in:	Journal of alloys and compounds Vol. 969; p. 172382
Main Authors:	Isaenko, Ludmila, Dong, Linfeng, Yelisseyev, Alexander, Lobanov, Sergei, Korzhneva, Ksenia, Gromilov, Sergey, Sukhih, Alexander, Pugachev, Alexei, Vedenyapin, Vitaly, Kurus, Alexei, Khamoyan, Avag, Lin, Zheshuai
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 25-12-2023
Subjects:	Birefringence and phase-matching Chalcogenides Damage threshold Energy band gap Laser induced Mid-IR nonlinear optical crystals Second harmonic generation Structure analysis Chalcogenides Damage threshold Second harmonic generation Laser induced Energy band gap Mid-IR nonlinear optical crystals Structure analysis Birefringence and phase-matching
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Summary:	The achievement of balanced properties among nonlinear optical (NLO) effect, laser induced damage threshold (LIDT) and optical birefringence is the key to obtain the excellent NLO crystals for harmonic mid-IR coherent radiation generation. In this work, we successfully synthesize and grow a new NLO chalcogenide crystal Li0.81Ag0.19InSe2 by utilizing a molecular design strategy with rational replacement between Li and Ag. This crystal not only enlarges the very low birefringence in AgInSe2 from ∼ 0.017 to ∼ 0.047, but also improves the rather small NLO effect in LiInSe2 from 11.8 pm/V to ∼26 pm/V while maintaining the LIDT almost unchanged. Based on the large size Li0.81Ag0.19InSe2 single crystals of optical quality, the spectroscopic properties are measured and the main parameters important for NLO output are determined. All these results demonstrate that Li0.81Ag0.19InSe2 is a promising mid-IR NLO crystal with balanced properties. •A new nonlinear optical (NLO) crystal Li0.81Ag0.19InSe2 is obtained by a rational replacement between lithium and silver.•The balanced NLO properties in infrared spectral region are achieved in Li0.81Ag0.19InSe2.•The large size Li0.81Ag0.19InSe2 single crystals with good optical quality are grown.•The Sellmeier equations and phase matching curves are determined from the refractive indices measured on crystal prisms.
ISSN:	0925-8388 1873-4669
DOI:	10.1016/j.jallcom.2023.172382