Broadband relative spectral calibration of an HgCdTe photodetector

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This study addresses the spectral calibration of HgCdTe photodetectors for the METimage instrument across the 3.55 µm to 13.80 µm range. It employs tuneable quantum cascade lasers combined with an integrating sphere to characterize the instrument spectral response function. By partnering with national metrology institutes, it overcomes the precision limitations associated with small-aperture sensor calibration.