Journal
JOURNAL OF APPLIED PHYSICS
Volume 94, Issue 1, Pages 279-283Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1578534
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Lasing conditions in a dye-doped cholesteric liquid crystal (ChLC) have been studied in view of optical modes for the light propagating in ChLCs using a polymeric dye with the transition dipole moment parallel to the local director of the ChLC host. We found that lasing always occurs at the lower-energy edge of the photonic gap. This is because that the optical eigen mode at the lower-energy gap is linearly polarized parallel to the director, while it is perpendicular at the higher-energy gap. Because of this well-defined lasing condition, low-threshold lasing was successfully achieved. (C) 2003 American Institute of Physics.
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