TY - JOUR

T1 - A New Nonlinear Optical Selenide Crystal AgLiGa2Se4 with Good Comprehensive Performance in Mid-Infrared Region

AU - Yelisseyev, Alexander

AU - Lobanov, Sergei

AU - Molokeev, Maxim

AU - Zhang, Shengzi

AU - Pugachev, Alexei

AU - Lin, Zheshuai

AU - Vedenyapin, Vitaly

AU - Kurus, Alexei

AU - Khamoyam, Avag

AU - Isaenko, Ludmila

N1 - Crystal growth and investigation of physical properties were supported by Russian Science Foundation, Russia (#19-12-00085). Spectroscopic data were obtained at the Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, Russia; Ministry of Science and Higher Education, Russia (performed on a state assignment). The work on first-principles calculations also supported by National Science Foundation in China (No.51872297) and Fujian Institute of Innovation (FJCXY18010201) in Chinese Academy of Sciences. Publisher Copyright: © 2020 Wiley-VCH GmbH Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/3/4

Y1 - 2021/3/4

N2 - Mid-infrared (mid-IR) nonlinear optical (NLO) crystals are indispensable for the mid-IR lasers generation with tunable wavelengths from 3 to 20 µm. AgGaSe2 is a commercial mid-IR NLO crystal with the highest figures of merit, but suffers low laser damage threshold (LDT). To achieve the balance of optical transmission, NLO effect, and LDT, it is proposed to molecularly modify the AgGaSe2 structure by introducing the [LiSe4] tetrahedra, and successfully grow large crystals of a new selenide AgLiGa2Se4. The replacement of half of the heavy Ag+ cations with light Li+ increases the band gap to 2.2 eV (vs. 1.7 eV in AgGaSe2). The LDT value in AgLiGa2Se4 increases five times compared to that in AgGaSe2, while keeping a relatively large NLO susceptibility of 26 pm V−1. Moreover, the thermal expansion coefficients in AgLiGa2Se4 are approximately two times lower in absolute value compared with AgGaSe2, which is beneficial to the large crystal growth. All these advantages would make AgLiGa2Se4 a new promising NLO crystal for mid-IR laser applications.

AB - Mid-infrared (mid-IR) nonlinear optical (NLO) crystals are indispensable for the mid-IR lasers generation with tunable wavelengths from 3 to 20 µm. AgGaSe2 is a commercial mid-IR NLO crystal with the highest figures of merit, but suffers low laser damage threshold (LDT). To achieve the balance of optical transmission, NLO effect, and LDT, it is proposed to molecularly modify the AgGaSe2 structure by introducing the [LiSe4] tetrahedra, and successfully grow large crystals of a new selenide AgLiGa2Se4. The replacement of half of the heavy Ag+ cations with light Li+ increases the band gap to 2.2 eV (vs. 1.7 eV in AgGaSe2). The LDT value in AgLiGa2Se4 increases five times compared to that in AgGaSe2, while keeping a relatively large NLO susceptibility of 26 pm V−1. Moreover, the thermal expansion coefficients in AgLiGa2Se4 are approximately two times lower in absolute value compared with AgGaSe2, which is beneficial to the large crystal growth. All these advantages would make AgLiGa2Se4 a new promising NLO crystal for mid-IR laser applications.

KW - crystal growth

KW - first principles calculations

KW - inorganic functional materials

KW - laser damage threshold

KW - second harmonic generation

KW - TE

KW - SE

KW - TEMPERATURE-DEPENDENCE

KW - MID-IR

KW - GROWTH

KW - GAP

KW - 2ND-HARMONIC GENERATION

UR - http://www.scopus.com/inward/record.url?scp=85097607023&partnerID=8YFLogxK

U2 - 10.1002/adom.202001856

DO - 10.1002/adom.202001856

M3 - Article

AN - SCOPUS:85097607023

VL - 9

JO - Advanced Optical Materials

JF - Advanced Optical Materials

SN - 2195-1071

IS - 5

M1 - 2001856

ER -