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JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS
Volume 43, Issue 2, Pages 631-636Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.43.631
Keywords
dye laser; chiral nematic liquid crystal; photonic effect; order parameter; DFB laser; optical eigen mode; density of mode
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We have studied lasing in dye-doped chiral nematic liquid crystals (N*LCs). To demonstrate the advantages of using a polymer dye, that is highly aligned along the local director of N*LCs, over commercial small molecule dyes such as 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostryl)-4H-pyran (DCM), comparative studies of the fluorescence spectra, lasing conditions and order parameters have been made using polymer-dye doped N*LC and DCM-doped N*LC cells. Right-and left-circularly polarized fluorescence spectra for both dyes were accurately simulated by taking account of their density of modes and order parameters. These results indicate that the greater alignment afforded by the polymer dye in N*LCs provides ideal conditions for lasing.
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