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Experimental setup for propagation loss measurements. The glow bar beam (TE or TM polarized) is focused on the ridge front facet. The transmitted light emerging from the rear facet is focused on a HgCdTe detector. Rear facet and transmitted light can also be imaged on a QWIP camera, as shown on the figure.
(a) Glow bar emission transmitted through the different optical elements (without waveguide) of the setup. (b) Glow bar emission transmitted by the waveguide. The two gray arrows correspond to the two regions where a zoom is performed in (c). [(c) and (d)] Zoom on the two regions with a common vertical scale.
Fourier transform of the spectra shown in Fig. 2(c), centered around (a) and (b) around . Inset: zoom on the and orders in a linear scale.
Transmission oscillations of the QCL (square) and blackbody (circles) around in a ridge.
Sum up of the optical properties (effective index and propagation loss) for the two wavelength ranges under study.
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