Giant Non-Resonant Infrared Second Order Nonlinearity in γ -NaAsSe2

Jingyang He, Abishek K. Iyer, Michael J. Waters, Sumanta Sarkar, Rui Zu, James M. Rondinelli, Mercouri G. Kanatzidis, Venkatraman Gopalan

Research output: Contribution to journalArticlepeer-review

Abstract

Infrared laser systems are vital for applications in spectroscopy, communications, and biomedical devices, where infrared nonlinear optical (NLO) crystals are required for broadband frequency down-conversion. Such crystals need to have high non-resonant NLO coefficients, a large bandgap, low absorption coefficient, and phase-matchability among other competing demands; for example, a larger bandgap leads to smaller NLO coefficients. Here, the successful growth of single crystals of γ -NaAsSe2 that exhibit a giant second harmonic generation (SHG) susceptibility of d11 = 590 pm V−1 at 2 µm wavelength is reported; this is ~18 times larger than that of commercial AgGaSe2 while retaining a similar bandgap of ~1.87 eV, making it an outstanding candidate for quasi-phase-matched devices utilizing d11. In addition, γ -NaAsSe2 is both Type I and Type II phase-matchable, and has a transparency range up to 16 µm wavelength. Thus, γ -NaAsSe2 is a promising bulk NLO crystal for infrared laser applications.

Original languageEnglish (US)
JournalAdvanced Optical Materials
DOIs
StateAccepted/In press - 2021

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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