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Exploring possibilities of regular self-pulsing in monolithic and external cavity mid-IR QCLs
Mid-IR Quantum cascade lasers (QCLs), at a low pump excess above threshold [1], show features of Risken-Nummedal-Graham-Haken (RNGH) instabilities [2,3] related to the excitation of coherent Rabi oscillations in the gain medium and therefore might exhibit self-pulsations (SP). The difficulties for practical use of RNGH SP in monolithic mm long QCLs originate from the quasiperiodic chaotic behavior of the pulse train when the coherence length is smaller than the length of the sample, while in the monolithic short cavity (100 µm) QCLs very high pulse repetition rate prohibit practical applications.

Authors: N. Vukovic, J. Radovanovic, V. Milanovic, D. Boiko

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