Ultralow threshold laser action from toroidal polymer microcavity
Date
2009Source Title
Applied Physics Letters
Print ISSN
0003-6951
Publisher
American Institute of Phycsics
Volume
94
Issue
20
Language
English
Type
ArticleItem Usage Stats
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Abstract
We report laser action from a toroidal microcavity coated with π-conjugated polymer. An ultralow threshold value of ∼200 pJ/pulse is achieved by free space excitation in ambient conditions. This is the lowest threshold energy obtained in microtoroid lasers by free space excitation. The effective refractive index of the polymer, extracted from Fourier analysis of emission spectra, is 1.787, which is very close to measured value of 1.790 indicating that laser modes are located around the circumference of the cavity as whispering gallery resonances. © 2009 American Institute of Physics.
Keywords
Ambient conditionsEffective refractive index
Emission spectrums
Free space
Laser action
Polymer microcavity
Threshold energy
Toroidal microcavity
Ultra-low threshold
Whispering gallery
Emission spectroscopy
Fourier analysis
Microcavities
Organic polymers
Polymers
Refractive index
Lasers