TITLE

Random lasing in porous scattering medium

AUTHOR(S)
Yashchuk, Vasil P.; Prygodiuk, O.; Koreniuk, V.; Tikhonov, E.; Bezrodny, V.
PUB. DATE
September 2008
SOURCE
Applied Physics B: Lasers & Optics;Sep2008, Vol. 92 Issue 4, p593
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The spectrum behavior evolution and the threshold of random lasing depending on the way of photon walk randomization in an active random medium were investigated. The following three ways of photon walk randomization were implemented: multiple light scattering by corundum and silica particles embedded into a solid polymer solution of dye (astrafloxin), multiple light reflection at sub-millimeter extensive air pores (mean diameter 200 μm) produced in the medium, and the combined action of both these effects. The most effective lasing is observed in the case of an active medium with air pores and scattering particles in the interpore space. Such a combined porous scattering medium acts as a network of dielectric waveguides transmitting effectively the random light. This spatial structure of the random active medium significantly increases the photon path in the medium, thereby promoting photon multiplication due to stimulated emission. In this combined medium the random lasing reveals the narrowest spectrum, the lowest threshold, and the highest density of spectral energy in the spectrum maximum.
ACCESSION #
34003880

 

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