2010/11/25 by Jonathan Andreasen, Patrick Sebbah, Christian Vanneste +1 · 12 citations
Chemistry · Computer Science · Physics and Astronomy · #Atomic physics #Chemistry #Coherent backscattering #Laser #Lasing threshold #Neural Networks and Reservoir Computing #Optics #Physics #Polarization (electrochemistry) #Population inversion #Quantum optics and atomic interactions #Random laser #Random lasers and scattering media #Scattering #physics.optics
paper · pdf · doi:10.1103/physreva.84.023826
published in Physical Review A 84(2) (American Physical Society) · 10 pages, 5 figures
arxiv created 2010/11/25 · openalex publication_date 2011/08/16 · arxiv updated 2011/08/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A numerical study is presented of random lasers as a function of the pumping rate above the threshold for lasing. Depending on the leakiness of the system resonances, which is typically larger in random lasers compared to conventional lasers, we observe that the stationary lasing regime becomes unstable above a second threshold. Coherent instabilities are observed as self pulsation at a single frequency of the output intensity, population inversion, as well as the atomic polarization. We find these Rabi oscillations have the same frequency everywhere in the random laser despite the fact that the field intensity strongly depends on the spatial location.