We propose a technique based on Fabry-Pérot fringes to analyze, in a broad wavelength range, the waveguide properties of semiconductor lasers in the midinfrared spectrum. This technique has been applied to strain-balanced Ga0.32In0.68As∕Al0.64In0.36As quantum cascade lasers, with a double phonon active region, in order to determine propagation losses and the effective index between 2.5 and 8μm wavelength. These results are in good agreement with the values obtained using another method.
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Peter et al. (2008) studied this question.
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