4.2 Article

Effect of particle size and shape on nonresonant random laser action of dye-doped polymer random media

Journal

OPTICAL REVIEW
Volume 17, Issue 3, Pages 300-304

Publisher

OPTICAL SOC JAPAN
DOI: 10.1007/s10043-010-0053-0

Keywords

random laser; gain media; photopolymer; multiple scattering; particles; aggregates

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Funding

  1. Ministry of Education, Culture, Sports, Science and Technology

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We present an experimental study of the light emission from dye-doped polymer random media dispersed with TiO(2) particles of various sizes, shapes, and structures. Random lasing with nonresonant feedback, similar to that for spherically shaped particles that are used for conventional random lasers, is observed for almost all types of particles and aggregates. The efficiency of random lasing for each medium is analyzed using the relationship between the emission spectrum and the transport mean free path (TMFP), which is measured by enhanced backscattering experiments. Results show that the peak emission intensity depends strongly on the particle shape and structure, whereas the spectral linewidth is governed by the TMFP.

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