Novel technique detects mid-wave infrared spectra using upconversion in a PPLN waveguide, highlighting practical advantages.
This article presents a novel room-temperature Mid-Wave Infrared spectroscopy (MWIR) technique utilizing upconversion in a 2cm-long PPLN ridge waveguide. Addressing limitations of costly, cryo-dependent FTIR, our "non-linear spectrometer" samples MWIR spectra by sweeping a low-power, continuous wave monochromatic pump laser, enabling detection with sensitive silicon detectors. Experimental validation with a channelled spectrum demonstrated accurate thermal source spectral modulation recovery, showing a 2% relative error. This robust approach offers a promising pathway for miniaturized, practical MIR spectroscopic tools.
No takes yet. Share an insight, caveat, or question.
Rai et al. (2025) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: