Monte Carlo calculations of spectral features in random lasing
Anno: 2010
Autori: Mujumdar S., Torre R., Ramachandran H., Wiersma D.
Affiliazione autori: Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India; European Lab Nonlinear Spect, I-50019 Florence, Italy; Raman Res Inst, Bangalore 560080, Karnataka, India
Abstract: Continuing our ongoing investigations of random lasing, we used the Monte Carlo method to simulate random walks of photons within a multiply scattering medium. By initially applying this technique to calculate pulse-stretching in a passive disordered medium, we elucidated its agreement with analytical diffusion theory. Thereafter, we introduced conditions of optical amplication, and reproduced the experimentally observed spectral features like spectral narrowing, intensity enhancement, bichromaticity, mode competition, etc., in a random laser. After investigating diffusive and sub-diffusive regimes of scattering, we formulated our results in terms of a gain subvolume, the functioning of which depends upon local gain conditions. We then used a modified approach of this technique to study ultranarrow random lasing modes, and successfully reproduced these modes observed in a random laser. Based on our simulations, we were able to explain the origins of ultra-narrow lasing modes as excessively amplified extended modes.
Giornale/Rivista: JOURNAL OF NANOPHOTONICS
Volume: 4 Da Pagina: 041550 A: 041550
Parole chiavi: Random lasing; multiple scattering; Monte Carlo; light diffusion; random walksDOI: 10.1117/1.3388717Citazioni: 19dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-18Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui
