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Two-segment distributed feedback (DFB) GaAs/AlGaAs bound-to-continuum quantum cascade lasers emitting at ∼10.8 µm were fabricated and investigated. Reversible switching between two different DFB modes by current injection control yielding sidemode suppression ratios up to >23 dB is reported. Two different devices were fabricated for which the distance between the different DFB modes is 1.5 and 2.5 cm−1, respectively, and quasi-continuous tuning over a range of >9 cm−1 (105 nm) between 120 and 250 K was observed.
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Höfling et al. (2006) studied this question.
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