Numerical study of Risken–Nummedal–Graham–Haken instability in mid-infrared Fabry–Pérot quantum cascade lasers
| Autor: | N. Vukovic, Jelena Radovanović, Dmitri L. Boiko, V. Milanović |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Multi-mode optical fiber Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology Laser 01 natural sciences Instability Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention 010309 optics law Cascade Quantum electrodynamics 0103 physical sciences Waveform Electrical and Electronic Engineering 0210 nano-technology Quantum Excitation Fabry–Pérot interferometer |
| Zdroj: | Optical and Quantum Electronics. 52 |
| ISSN: | 1572-817X 0306-8919 |
| Popis: | We review our recent theoretical studies on multimode instabilities in Fabry–Perot cavity mid-infrared quantum cascade lasers (QCLs) caused by parametric excitation of Rabi flopping oscillations. Numerical simulations are based on the semiclassical traveling wave Maxwell–Bloch equations. QCLs with a few mm cavity without an absorber exhibit intermittent RNGH self-pulsations, while regular self-pulsations are possible in short-cavity QCLs, with the cavity length of 100 μm or smaller. However, the second threshold in short-cavity QCLs is significantly increased compared to the values for a few mm long devices. We provide here a new insight on RNGH instability via bifurcation analysis of the output waveform and studies of the recurrence period density entropy. We propose an interpretation of the broadening/narrowing of the optical spectrum of a QCL i.e. switching the RNGH instability on and off observed in experiment. |
| Databáze: | OpenAIRE |
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