Non-collinear upconversion of infrared light

Christian Pedersen et al., Optics Express 22, pp. 28027 – 28036 (2014)
Non-collinear upconversion of infrared light using NLIR technology as in Optics Express, 2014

Mid-infrared hyperspectral imaging with MIDWAVE Spectrometer

Two dimensional mid-infrared upconversion imaging provides unique spectral and spatial information showing good potential for mid-infrared spectroscopy and hyperspectral imaging. However, to extract spectral or spatial information from the upconverted images an elaborate model is needed, which includes non-collinear interaction. We derive here a general theory providing the far field of the upconverted light when two arbitrary fields interact inside a nonlinear crystal. Theoretical predictions are experimentally verified for incoherent radiation and subsequently applied to previously published data with good agreement.

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