Abstract
Incoherent radiation of amplifying random media was investigated using Monte Carlo simulation and the characteristics of random laser were observed. The entire emission spectra of the random media would become narrow abruptly when pumping energies exceeded certain threshold values, and as the pumping energies further increased, distinct sharp peaks would emerge on the spectrum background. The intensity of a certain spatial point within the scattering media was contributed from emissions of many frequencies. The intensity of a single frequency of the entire spectrum was contributed with emissions from wide spatial location and angle ranges. It has been pointed out that the incoherent radiation of amplifying random media is essentially different from amplified spontaneous emission without any feedback as well as conventional resonant-feedback laser. The explanation on distinct sharp peaks is that rare photons have experienced rather more scattering events and walked longer paths in amplifying random media, which accumulates more gain for these photons.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Letokhov V S. Stimulated emission of an ensemble of scattering particles with negative absorption. JETP Letters, 1967, 5(8): 212–215
Letokhov V S. Generation of light by a scattering medium with negative resonance absorption. Soviet Physics JETP, 1968, 26(4): 835–839
Noginov M A, Bahoura M, Noginova N, et al. Study of absorption and reflection in solid-state random laser media. Applied Optics, 2004, 43(21): 4237–4243
Lawandy N M, Balachandran R M, Gomes A S L, et al. Laser action in strongly scattering medium. Nature, 1994, 368(6470): 436–438
Cao H, Xu J Y, Zhang D Z, et al. Spatial confinement of laser light in active random media. Physical Review Letters, 2000, 84(24): 5584–5587
Zhang Y, Wang G, Cui Y P, et al. Electrochemical deposition and stimulated emission of zinc oxide thin films. Chinese Journal of Lasers, 2004, 31(1): 97–100 (in Chinese)
Cao H, Xu J Y, Chang S H, et al. Transition from amplified spontaneous emission to laser action in strongly scattering media. Physical Review E, 2000, 61(2): 1985–1989
Mujumdar S, Ricci M, Torre R, et al. Amplified extended modes in random lasers. Physical Review Letters, 2004, 93(5): 053903-1–053903-4
Wang C, Liu J S. Polarization dependence of lasing modes in two-dimensional random lasers. Physics Letters A, 2006, 353(2–3): 269–272
Mujumdar S, Cavalieri S, Wiersma D S. Temperature — tunable random lasing: numerical calculations and experiments. Journal of the Optical Society of America B, 2004, 21(1): 201–207
Schafer F P. Dye Lasers (in Chinese, trans. Chen Changmin, Sun Mengjia, Su Dachun). Beijing: Science Press, 1987, 92–174
Niginov M A, Bahoura M, Noginova N, et al. Stimulated emission in scattering and composite dielectric media (random lasers): effect of particle size. Proceedings of SPIE, 2003, 5218:124–139
van de Hulst H C. Light Scattering by Small Particles. New York: Jonh Wiley & Sons Press, 1957, 115–130
Cao H. Random lasers: development, features and applications. Optics & Photonics News, 2005, 16(1): 24–29
Author information
Authors and Affiliations
Corresponding author
Additional information
__________
Translated from Chinese Journal of Lasers, 2007, 34(3): 364–369 [译自: 中国激光]
Rights and permissions
About this article
Cite this article
Ye, Y., Fan, D. Incoherent radiation of amplifying random media. Front. Optoelectron. China 1, 95–100 (2008). https://doi.org/10.1007/s12200-008-0023-3
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12200-008-0023-3