The experimental setup of the dual QCLs and PA spectroscopy for noninvasive glucose detection is shown in Fig. 5. In the developed setup, two single-wavelength QCLs were employed. The first QCL was at a glucose fingerprint of 9.25 \(\upmu\)m (1080 cm\(^{-1}\)) (QD9500CM1, Thorlabs, Newton, NJ, USA), and the second was employed as a reference to the measurements lasing at 10.3 \(\upmu\)m (970 cm\(^{-1}\)) (QD10500CM1, Thorlabs, Newton, NJ, USA). The threshold currents of the 9.25 \(\upmu\)m and 10.3 \(\upmu\)m QCLs are around 180 mA and 280 mA, respectively. The light beams of the dual…
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