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Operational regimes of lasers based on gain media with a large Raman scattering cross-section
E A Tereshchenkov1,2,3, E S Andrianov4,5,6, A A Zyablovsky1,2,3,7
1Moscow Institute of Physics and Technology, 9 Institutskiy Per., Moscow, Russia, 141700.
Scientific Reports
|May 9, 2022
Summary
New laser operation regimes emerge with strong electron-phonon coupling in quantum dots and perovskites. Above a critical coupling, lasers exhibit joint photon-phonon oscillations or chaotic behavior, depending on initial conditions.
Area of Science:
- Laser Physics
- Materials Science
- Quantum Optics
Background:
- Novel gain media like quantum dots and perovskites exhibit large Raman scattering cross-sections.
- These materials are characterized by strong electron-phonon coupling, a key factor in their optical properties.
Purpose of the Study:
- To analyze laser operation regimes in media with strong electron-phonon coupling.
- To investigate the influence of the Fröhlich constant on laser dynamics.
- To identify conditions leading to new operational regimes and multi-stable states.
Main Methods:
- Utilized the Fröhlich Hamiltonian to model electron-phonon coupling.
- Analyzed laser system behavior above the lasing threshold.
- Investigated the impact of varying parameters like Fröhlich constant, pump rate, and resonator eigenfrequency.
Main Results:
- Identified a critical Fröhlich constant value separating conventional and unusual laser regimes.
- Observed joint self-oscillations of coherent phonons and photons above the critical value.
- Discovered chaotic regimes and multi-stable dynamical states under specific conditions.
Conclusions:
- Strong electron-phonon coupling fundamentally alters laser dynamics, enabling new operational regimes.
- Laser behavior is highly sensitive to initial conditions when multiple dynamical states are stable.
- This research opens avenues for controlling laser output through material properties and operating parameters.
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