Share Email Print

Proceedings Paper

Mirrorless lasing in liquid crystalline materials
Author(s): Wenyi Cao; Heino Finkelmann; Seok-Tae Kim; Antonio Munoz; Peter Palffy-Muhoray; Bahman Taheri; Robert J. Twieg
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

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.

Paper Details

Date Published: 13 June 2002
PDF: 7 pages
Proc. SPIE 4642, Organic Photonic Materials and Devices IV, (13 June 2002); doi: 10.1117/12.470459
Show Author Affiliations
Wenyi Cao, Kent State Univ. (United States)
Heino Finkelmann, Albert-Ludwigs-Univ. Freiburg (Germany)
Seok-Tae Kim, L.G. Cable Research Ctr. (United States)
Antonio Munoz, Univ. Autonoma Metropolitana (United States)
Peter Palffy-Muhoray, Kent State Univ. (United States)
Bahman Taheri, Kent State Univ. (United States)
Robert J. Twieg, Kent State Univ. (United States)

Published in SPIE Proceedings Vol. 4642:
Organic Photonic Materials and Devices IV
Bernard Kippelen; Donal D. C. Bradley, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?