12 April 2005 Photonic band edge lasing in dye-doped chiral nematic bimesogen liquid crystals
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In this paper we investigate Photonic Band Edge (PBE) lasing from a homologous series of non-symmetric bimesogen liquid crystals (the mesogenic units are not identical) with varying physical parameters. A homologous series was synthesised, where the number of methylene units in the linking flexible spacer chain ranged from 6 to 12. Our results show a clear odd-even effect within the threshold values and slope efficiencies, of the PBE lasers, when plotted as a function of the number of methylene units in the spacer chain. The even spacer bimesogen PBE lasers performed with an overall higher efficiency (< 2μJ/pulse threshold values and 8% slope efficiency) than the odd spacer bimesogens PBE lasers (3.5μJ/pulse threshold values and 1% slope efficiency). We believe that this odd-even effect is due to the odd-even effect observed within the host physical parameters; a consequence of the molecular shape anisotropy
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Alison Ford, Alison Ford, Stephen Morris, Stephen Morris, Mikhail Pivnenko, Mikhail Pivnenko, Andrew Blatch, Andrew Blatch, Harry Coles, Harry Coles, "Photonic band edge lasing in dye-doped chiral nematic bimesogen liquid crystals", Proc. SPIE 5741, Emerging Liquid Crystal Technologies, (12 April 2005); doi: 10.1117/12.593330; https://doi.org/10.1117/12.593330

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