MgSiP2: An Infrared Nonlinear Optical Crystal with a Large Non‐Resonant Phase‐Matchable Second Harmonic Coefficient and High Laser Damage Threshold
(2023) Advanced Optical Materials — p. 2301060 (2023)
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He, Jingyang 
- Abstract
- Superior infrared nonlinear optical (NLO) crystals are in urgent demand in thedevelopment of lasers and optical technologies for communications andcomputing. The critical challenge is to find a crystal with large non-resonantphase-matchable NLO coefficients and high laser damage threshold (LDTs)simultaneously, which however scale inversely. This work reports such amaterial, MgSiP2,that exhibits a large second harmonic generation (SHG)coefficient ofd14≈d36=89±5pmV−1at 1550 nm fundamental wavelength,surpassing the commercial NLO crystals AgGaS2, AgGaSe2, and ZnGeP2.First principles theory reveals the polarizability and geometric arrangement ofthe [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 sixtimes larger than ZnGeP2and three times larger than CdSiP2. It has a widetransparency window of 0.53–10.35μm, allowing broadband tunability.Further, it is Type I and Type II phase-matchable with large effective SHGcoefficients ofdeff,I≈80.2 pm V−1anddeff,II≈73.4 pm V−1. The outstandingproperties of MgSiP2make it a highly attractive candidate for opticalfrequency conversion in the infrared.
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Citations
He, J., Guan, Y., Trinquet, V., Brunin, G., Wang, K., Robinson, R., Zu, R., Yoshida, S., Lee, S. H., Wang, Y., Zhu, Y., Rignanese, G.-M., Mao, Z., & Gopalan, V. (2023). MgSiP2: An Infrared Nonlinear Optical Crystal with a Large Non‐Resonant Phase‐Matchable Second Harmonic Coefficient and High Laser Damage Threshold. Advanced Optical Materials, 2301060. https://doi.org/10.1002/adom.202301060 (Original work published 2023)