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JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS
Volume 43, Issue 9A, Pages 6084-6087Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.43.6084
Keywords
cholesteric liquid crystal; laser; thiophene; photonic effect; DFB cavity
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Lasing behavior has been studied in cholesteric liquid crystals (CLCs) doped with three oligothiophene (OT) derivatives such as alpha, alpha'-dimethylquaterthiophene (DMQtT) as laser dyes. CLCs spontaneously form a distributed feedback cavity, in which OT molecules are highly oriented parallel to the local director of CLCs with an order parameter of about 0.65, as studied by polarized emission spectra. Lasing occurs at only the low-energy edge of the photonic bandgap above a threshold input power of about 4.6 mJ/cm(2)/pulse in a DMQtT-doped CLC cell by pulsed (4 ns duration and 10 Hz repetition) excitation. This lasing emission mode selection is attributed to the high order parameter of OT molecules.
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