Spatially resolved lasers using a glassy cholesteric liquid crystal film with lateral pitch gradient

Wei, Simon H.; Chen, Shaw H.

doi:10.1063/1.3568889

Spatially resolved lasers using a glassy cholesteric liquid crystal film with lateral pitch gradient

Journal Article · Thu Mar 17 00:00:00 EDT 2011 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.3568889· OSTI ID:1095285

Wei, Simon H. ^[1]; Chen, Shaw H. ^[2]

University of Rochester Department of Chemical Engineering and Laboratory for Laser Energetics, , Rochester, New York 14623-1212, USA; Laboratory for Laser Energetics, University of Rochester, Rochester, NY
University of Rochester Department of Chemical Engineering and Laboratory for Laser Energetics, , Rochester, New York 14623-1212, USA

To fabricate spatially resolved glassy cholesteric liquid crystal (CLC) lasers, a lateral pitch gradient was introduced by thermally activated diffusion across the interface of two films comprising nematic and cholesteric oligofluorene doped with a red-emitting oligifluorene. The formation of spatially resolved Grandjean–Cano bands was accountable by strong surface anchoring at substrates and the qualitative chiral concentration profile. Across each band there was a common stop band, and a set of bands produced multiple lasing peaks across the spectral range determined by light-emitter’s fluorescence spectrum. The resultant lasing thresholds, 6.6–7.6 mJ/cm², and slope efficiencies, 0.2%–1.5%, are superior to those reported to date for gradient-pitch CLC lasers.

Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Sponsoring Organization:: USDOE

DOE Contract Number:: FC52-08NA28302

OSTI ID:: 1095285

Report Number(s):: DOE/NA/28302-995; 2011-29; 1975

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 11 Vol. 98; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

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