TY - JOUR
T1 - MgSiP2
T2 - An Infrared Nonlinear Optical Crystal with a Large Non-Resonant Phase-Matchable Second Harmonic Coefficient and High Laser Damage Threshold
AU - He, Jingyang
AU - Guan, Yingdong
AU - Trinquet, Victor
AU - Brunin, Guillaume
AU - Wang, Ke
AU - Robinson, Robert
AU - Zu, Rui
AU - Yoshida, Suguru
AU - Lee, Seng Huat
AU - Wang, Yu
AU - Zhu, Yanglin
AU - Rignanese, Gian Marco
AU - Mao, Zhiqiang
AU - Gopalan, Venkatraman
N1 - Publisher Copyright:
© 2023 The Authors. Advanced Optical Materials published by Wiley-VCH GmbH.
PY - 2023/12/18
Y1 - 2023/12/18
N2 - Superior infrared nonlinear optical (NLO) crystals are in urgent demand in the development of lasers and optical technologies for communications and computing. The critical challenge is to find a crystal with large non-resonant phase-matchable NLO coefficients and high laser damage threshold (LDTs) simultaneously, which however scale inversely. This work reports such a material, MgSiP2, that exhibits a large second harmonic generation (SHG) coefficient of d14≈d36 = 89 ± 5 pm V−1 at 1550 nm fundamental wavelength, surpassing the commercial NLO crystals AgGaS2, AgGaSe2, and ZnGeP2. First principles theory reveals the polarizability and geometric arrangement of the [SiP4] tetrahedral units as the origin of this large nonlinear response. Remarkably, it also exhibits a high LDT value of 684 GW cm−2, which is six times larger than ZnGeP2 and three times larger than CdSiP2. It has a wide transparency window of 0.53–10.35 µm, allowing broadband tunability. Further, it is Type I and Type II phase-matchable with large effective SHG coefficients of deff,I ≈80.2 pm V−1 and deff,II ≈73.4 pm V−1. The outstanding properties of MgSiP2 make it a highly attractive candidate for optical frequency conversion in the infrared.
AB - Superior infrared nonlinear optical (NLO) crystals are in urgent demand in the development of lasers and optical technologies for communications and computing. The critical challenge is to find a crystal with large non-resonant phase-matchable NLO coefficients and high laser damage threshold (LDTs) simultaneously, which however scale inversely. This work reports such a material, MgSiP2, that exhibits a large second harmonic generation (SHG) coefficient of d14≈d36 = 89 ± 5 pm V−1 at 1550 nm fundamental wavelength, surpassing the commercial NLO crystals AgGaS2, AgGaSe2, and ZnGeP2. First principles theory reveals the polarizability and geometric arrangement of the [SiP4] tetrahedral units as the origin of this large nonlinear response. Remarkably, it also exhibits a high LDT value of 684 GW cm−2, which is six times larger than ZnGeP2 and three times larger than CdSiP2. It has a wide transparency window of 0.53–10.35 µm, allowing broadband tunability. Further, it is Type I and Type II phase-matchable with large effective SHG coefficients of deff,I ≈80.2 pm V−1 and deff,II ≈73.4 pm V−1. The outstanding properties of MgSiP2 make it a highly attractive candidate for optical frequency conversion in the infrared.
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U2 - 10.1002/adom.202301060
DO - 10.1002/adom.202301060
M3 - Article
AN - SCOPUS:85164768361
SN - 2195-1071
VL - 11
JO - Advanced Optical Materials
JF - Advanced Optical Materials
IS - 24
M1 - 2301060
ER -