2007/03/28 by X. Wu, H. Cao, Hui Cao +2
Engineering · Physics and Astronomy · #FOS: Physical sciences #Optics (physics.optics) #Quantum optics and atomic interactions #Random lasers and scattering media #Terahertz technology and applications #physics.optics
paper · pdf · doi:10.48550/arxiv.physics/0703255
arxiv created 2007/03/28 · openalex publication_date 2007/03/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We have measured the spectral correlations and intensity statistics of random lasing modes in weakly scattering systems, and compared them to those of the amplified spontaneous emission spikes. Their dramatic differences revealed the distinct physical mechanisms. We find that local excitation of a weakly scattering system may greatly reduce the number of lasing modes even without absorption outside the pumped region. The lasing modes can be very different from the quasimodes of the passive system due to selective amplification of the feedback from the scatterers within the local gain region.