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Voltage-current and light-current characteristics of a standard 12-μm-wide ridge QCL at room temperature. Inset: emission spectrum of the QCL.
Simplified schematics of the experimental setup, where DG, diffraction grating; BD, Black Diamond™ lenses; M, monochromator; PD, PbSe photodiode; LA, lock-in amplifier; TEC, temperature controller with laser driver. Inset: The InAs/AlSb laser chip design.
Back-reflection to the tilted ridge waveguide in Littrow configuration (dashed) vs Fabry–Pérot mode reflection (solid). Dotted lines correspond to the extreme tolerable values of the lasing wavelength, mode size, and the effective refractive index of the ridge waveguide. Linear scale is shown in the inset.
Normalized measured spectra at room temperature during continuous wavelength tuning between 3190 and 3275 nm.
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