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Updated: Mar 19, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
Published on: March 22, 2019
Polarization-independent frequency conversion from the infrared into the ultraviolet
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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.
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