Polarization-independent frequency conversion from the infrared into the ultraviolet
Abstract
In order to connect different quantum nodes as part of a quantum network, it is often necessary to bridge large spectral gaps through nonlinear frequency conversion as the individual nodes frequently operate at distinct wavelengths. Here, we demonstrate polarization-independent frequency conversion from 863 to 370 nm using a sum frequency generation process (SFG) in a periodically poled lithium niobate (PPLN) crystal. Our setup implements a Sagnac interferometer, which is modified to allow operation across a large wavelength range. We characterize the performance of the system in terms of conversion efficiency, spectral acceptance, and polarization preservation.
Fields of Study & Subjects
Photorefractive and Nonlinear Optics
Quantum Information and Cryptography
Quantum optics and atomic interactions
Publication details
- Journal / source
- Applied Optics
- Volume
- 65
- Issue
- 5
- Pages
- 1669–1669
- Publication date
- 20 January 2026
- Language
- EN