Loss-induced suppression and revival of lasing

Loss-induced suppression and revival of lasing

| B. Peng, Ş. K. Özdemir, S. Rotter, H. Yilmaz, M. Liertzer, F. Monifi, C. M. Bender, F. Nori, L. Yang
This study explores the loss-induced suppression and revival of lasing in coupled microresonators near an exceptional point (EP). By tuning the system parameters, losses can be converted into gain, leading to counterintuitive effects. The research demonstrates that near an EP, increasing loss can actually revive lasing, contrary to conventional laser theory. The system consists of two coupled silica whispering-gallery-mode resonators (WGMRs), each connected to a fiber-taper. By introducing additional loss to one resonator via a chromium-coated nanofiber tip, the system is steered toward an EP. This results in the coalescence of eigenvalues and eigenstates, leading to unique optical behaviors such as resonance trapping and mode exchange. The study shows that near the EP, the system exhibits non-trivial dynamics, with loss-induced recovery of lasing despite increased loss. Theoretical models and experimental data confirm the existence of an EP and its impact on the system's behavior. The findings highlight the counterintuitive nature of EPs and their potential for controlling and reversing loss effects in optical systems. The research also demonstrates the effect of loss on thermal nonlinearity and Raman lasing in microresonators, showing that increased loss can enhance intracavity field intensities and revive lasing. The results provide insights into the behavior of non-Hermitian systems and open new avenues for controlling loss in various physical systems.This study explores the loss-induced suppression and revival of lasing in coupled microresonators near an exceptional point (EP). By tuning the system parameters, losses can be converted into gain, leading to counterintuitive effects. The research demonstrates that near an EP, increasing loss can actually revive lasing, contrary to conventional laser theory. The system consists of two coupled silica whispering-gallery-mode resonators (WGMRs), each connected to a fiber-taper. By introducing additional loss to one resonator via a chromium-coated nanofiber tip, the system is steered toward an EP. This results in the coalescence of eigenvalues and eigenstates, leading to unique optical behaviors such as resonance trapping and mode exchange. The study shows that near the EP, the system exhibits non-trivial dynamics, with loss-induced recovery of lasing despite increased loss. Theoretical models and experimental data confirm the existence of an EP and its impact on the system's behavior. The findings highlight the counterintuitive nature of EPs and their potential for controlling and reversing loss effects in optical systems. The research also demonstrates the effect of loss on thermal nonlinearity and Raman lasing in microresonators, showing that increased loss can enhance intracavity field intensities and revive lasing. The results provide insights into the behavior of non-Hermitian systems and open new avenues for controlling loss in various physical systems.
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