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Journal of Applied Physics / Volume 107 / Issue 4 / ARTICLES / Lasers, Optics, and Optoelectronics

J. Appl. Phys. 107, 043101 (2010); http://dx.doi.org/10.1063/1.3284939 (9 pages)

Comparison of the performance of photonic band-edge liquid crystal lasers using different dyes as the gain medium

Carrie Mowatt1, Stephen M. Morris1, Myoung Hoon Song2, Timothy D. Wilkinson1, Richard H. Friend2, and Harry J. Coles1

1Centre of Molecular Materials for Photonic and Electronics, Electrical Engineering Division, Department of Engineering, University of Cambridge, 9 JJ Thomson Avenue, Cambridge CB3 0FA, United Kingdom
2Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom

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(Received 4 September 2009; accepted 6 December 2009; published online 16 February 2010)

The primary concern of this work is to study the emission characteristics of a series of chiral nematic liquid crystal lasers doped with different laser dyes (DCM, pyrromethene 580, and pyrromethene 597) at varying concentrations by weight (0.5–2 wt %) when optically pumped at 532 nm. Long-wavelength photonic band-edge laser emission is characterized in terms of threshold energy and slope efficiency. At every dye concentration investigated, the pyrromethene 597-doped lasers exhibit the highest slope efficiency (ranging from 15% to 32%) and the DCM-doped lasers the lowest (ranging from 5% to 13%). Similarly, the threshold was found to be, in general, higher for the DCM-doped laser samples in comparison to the pyrromethene-doped laser samples. These results are then compared with the spectral properties, quantum efficiencies and, where possible, fluorescence lifetimes of the dyes dispersed in a common nematic host. In accordance with the low thresholds and high slope efficiencies, the results show that the molar extinction coefficients and quantum efficiencies are considerably larger for the pyrromethene dyes in comparison to DCM, when dispersed in the liquid crystal host.

© 2010 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. SAMPLE PREPARATION
    1. Laser dyes
    2. Nematic LC
    3. Chiral nematic LC
  3. EXPERIMENTAL PROCEDURE
  4. RESULTS
    1. Spectral properties
    2. Molar extinction coefficients
    3. Quantum efficiencies
    4. Fluorescence lifetimes
    5. Optimum laser wavelength
    6. Laser emission characteristics
  5. DISCUSSION
  6. CONCLUSIONS

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KEYWORDS and PACS

Keywords

dye lasers, extinction coefficients, fluorescence, nematic liquid crystals, optical pumping, photonic crystals, radiative lifetimes

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3284939

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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    K. L. Woon, M. O'Neill, G. J. Richards, M. P. Aldred, and S. M. Kelly, Phys. Rev. E 71, 041706 (2005).

    S. M. Morris, A. D. Ford, M. N. Pivnenko, O. Hadeler, and H. J. Coles, Phys. Rev. E 74, 061709 (2006).

    A. D. Ford, S. M. Morris, M. N. Pivnenko, C. Gillespie, and H. J. Coles, Phys. Rev. E 76, 051703 (2007).

    S. M. Morris, A. D. Ford, M. N. Pivnenko, and H. J. Coles, J. Appl. Phys. 97, 023103 (2005)JAPIAU000097000002023103000001.

    Y. H. Huang, Y. Zhou, and S. T. Wu, Appl. Phys. Lett. 88, 011107 (2006)APPLAB000088000001011107000001.

    S. K. H. Wei, S. H. Chen, K. Dolgaleva, S. V. Lukishova, and R. W. Boyd, Appl. Phys. Lett. 94, 041111 (2009)APPLAB000094000004041111000001.


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