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13 June 2002 Mirrorless lasing in liquid crystalline materials
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Proceedings Volume 4642, Organic Photonic Materials and Devices IV; (2002)
Event: Symposium on Integrated Optoelectronic Devices, 2002, San Jose, California, United States
Cholesteric liquid crystals, because of their birefringence and periodic structure, and 1-d photonic band-gap materials. In the reflection band, classical light propagation is forbidden for one of the two eigenmodes; for this mode, the material acts as a distributed cavity host. This inherent distributed cavity effect modifies the fluorescence spectrum, and, if the material is optically pumped, allows population inversion and mirrorless lasing. We have studied emission from thin samples of liquid crystalline materials optically pumped by pico- and nanosecond laser pulses. We have observed laser emission, without an external cavity, from dye-doped liquid crystals, from pure cholesteric liquid crystals without dyes, and from cholesteric liquid crystal elastomers. We present the results of these experiments, discuss the relation between material properties and the lasing process, and consider promising materials and applications.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wenyi Cao, Heino Finkelmann, Seok-Tae Kim, Antonio Munoz, Peter Palffy-Muhoray, Bahman Taheri, and Robert J. Twieg "Mirrorless lasing in liquid crystalline materials", Proc. SPIE 4642, Organic Photonic Materials and Devices IV, (13 June 2002);

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