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Extensive study of the linewidth enhancement factor of a distributed feedback quantum cascade laser at ultra-low temperature

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Academic year: 2021

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Figure

Figure 1: Spectral characteristics of the free-running QCL operating at 77 K and under a continuous bias just below threshold at 325 mA (a) and above threshold at 340 mA (b).
Table 1: Physical and structural parameters used in the calculations.
Figure 2: Bifurcation diagram for the parameters included in Table 1.
Figure 3: Schematic of setup to measure the LEF with oscilloscope (OSCI), MCT detector (Kol- (Kol-mar KMPV50 0.5 J2), non-polarizing beam splitter (NPBS) with 90:10 transmission/reflection ratio, current source (self-made battery), linear piezo translation
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