The role of the thermally modulated order parameter in the diffusive laser action observed in dye doped nematic liquid crystals was investigated. Above a given pump energy a randomly distributed series of bright tiny spots appear, giving rise to a strongly fluctuating emission pattern. The spectral analysis reveals discrete sharp peaks (about 0.5 nm) slightly blueshifted with respect to the highest efficiency region of the gain medium. A comparative study was performed in systems having different sizes and confining geometries, corroborating the idea that the random lasing observed in dye doped nematic phase is fluctuation driven through a recurrent multiple scattering process. (c) 2006 American Institute of Physics.
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|Titolo:||Thermal behavior of random lasing in dye doped nematic liquid crystals|
|Data di pubblicazione:||2006|
|Appare nelle tipologie:||1.1 Articolo in rivista|