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QCL MIR modulation at 83.3 MHz without (a) and with (b) the germanium etalon.
The QCL dc spectrum (dashed) and its modulated spectrum at 83.3 MHz (solid) with NIR power of 0.5 mW (a), 1 mW (b), 1.5 mW (c), and 2 mW (d). Figure 4(e) gives the WM spectrum peak value plotted against the NIR power and its linear fit.
QCL MIR pure wavelength shift frequency response to the fs Ti:sapphire laser pulse train.
The QCL dc spectrum (dashed) and its modulated spectrum at 10 MHz (solid) with NIR power of 5 mW (a), 10 mW (b), 15 mW (c), 20 mW (d), and 25 mW (e). Figure 4(f) gives the wavelength shift amplitude dependency on the incident NIR power.
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