Comparison of an InSb detector and upconversion detector for infrared polarization spectroscopy

Rasmus L. Pedersen et al., Applied Spectroscopy 72, pp. 793 – 797 (2018)

NLIR enabling infrared polarization spectroscopy with high SNR

This paper compares the signal-to-noise ratio obtained using an InSb photodiode for infrared (IR) polarization spectroscopy to that obtained using an upconversion detector, and shows a factor 64 improvement by the change. Upconversion detection is based on using sum frequency generation to move the IR optical signal to near-visible wavelengths to improve the sensitivity.

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