Giant Non‐Resonant Infrared Second Order Nonlinearity in γ ‐NaAsSe2
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 09, 2021
- Source ID
- 10.1002/adom.202101729
Entities
People
- Abishek K. Iyer
- James M. Rondinelli
- Jingyang He
- Mercouri Kanatzidis
- Michael J. Waters
- Rui Zu
- Sumanta Sarkar
- Venkatraman Gopalan
Organizations
- Air Force Office of Scientific Research
- Northwestern University
- Pennsylvania State University