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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 21, Iss. 1 — Jan. 1, 2004
  • pp: 159–167

Random lasing in closely packed resonant scatterers

Xiaohua H. Wu, Alexey Yamilov, Heeso Noh, Hui Cao, Eric W. Seelig, and Robert P. H. Chang  »View Author Affiliations

JOSA B, Vol. 21, Issue 1, pp. 159-167 (2004)

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We report experimental and theoretical studies of the random lasing threshold and its fluctuation in an ensemble of highly packed spherical dielectric scatterers. The ratio of the sphere diameter to the lasing wavelength was varied in a wide range, which covered the transition from the weak Rayleigh scattering regime to the strong Mie scattering regime. Experimentally, when the diameters of monodispersed ZnO spherical particles changed from less than 100 to more than 600 nm we observed a drastic decrease of the lasing threshold at small-particle size followed by a plateau at large particle size. We attribute this effect to the particle-size dependence of transport mean free path lt, which was deduced from coherent backscattering measurements. Theoretical calculation of lt reproduced experimental behavior. Using the finite-difference time domain method, we obtained the lasing threshold and its standard deviation as functions of particle size in two-dimensional systems. The results of our numerical simulations are in qualitative agreement with the experimental data.

© 2004 Optical Society of America

OCIS Codes
(140.3460) Lasers and laser optics : Lasers
(290.4210) Scattering : Multiple scattering

Xiaohua H. Wu, Alexey Yamilov, Heeso Noh, Hui Cao, Eric W. Seelig, and Robert P. H. Chang, "Random lasing in closely packed resonant scatterers," J. Opt. Soc. Am. B 21, 159-167 (2004)

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