One salient characteristic of Quantum Cascade Laser (QCL) is its very short τ ∼ 1 ps gain recovery time that so far thwarted the attempts to achieve self-mode locking of the device into a train of single pulses. We show theoretically that four wave mixing, combined with the short gain recovery time causes QCL to operate in the self-frequency-modulated regime characterized by a constant power in time domain and stable coherent comb in the frequency domain. Coherent frequency comb may enable many potential applications of QCL's in sensing and measurement.
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Research Article| February 27 2014
Coherent frequency combs produced by self frequency modulation in quantum cascade lasers
Special Collection: On-Chip Mid-Infrared and THz Frequency Combs for Spectroscopy
J. B. Khurgin;
J. B. Khurgin, Y. Dikmelik, A. Hugi, J. Faist; Coherent frequency combs produced by self frequency modulation in quantum cascade lasers. Appl. Phys. Lett. 24 February 2014; 104 (8): 081118. https://doi.org/10.1063/1.4866868
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