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Proceedings Paper

Lasing of pyrromethene 597 in 2D holographic polymer dispersed liquid crystals: influence of columnar conformation
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Paper Abstract

Holographic photopolymerization, such as used to form holographic polymer dispersed liquid crystals (HPDLCs), has the advantage of combining the desirable processing properties of polymers with a periodic distribution of an electrically tunable medium (LC). Herein we describe laser oscillations resulting from distributed feedback in fieldmodulated, 2-D H-PDLC photonic crystals. Compared to results of lasing from pyrromethene 597 in 1-D H-PDLCs, the linewidth of the laser action decreases by at least a factor of four and the lasing wavelength is electrically tunable over 5 nm. The 2-D H-PDLCs consist of LC columns within a polymer matrix that were created by interference of four writing beams on the sample cell. Two configurations were studied; one comprising a reflection grating orthogonal to a transmission grating (in-plane) and the other from two orthogonal transmission gratings (out-of-plane). Given that the lattice spacing was the same for both samples, the lasing wavelengths were similar; however the polarization dependence on lasing threshold varied by a factor of three for the in-plane configuration and electrical switching resulted in bimodal lasing. The out-of-plane geometry showed no polarization dependence on lasing threshold and the lasing blue-shifted with applied electric field.

Paper Details

Date Published: 3 February 2009
PDF: 6 pages
Proc. SPIE 7232, Emerging Liquid Crystal Technologies IV, 72320K (3 February 2009); doi: 10.1117/12.810496
Show Author Affiliations
Rachel Jakubiak, Air Force Research Lab. (United States)
Vincent P. Tondiglia, Air Force Research Lab. (United States)
Science Applications International Corp. (United States)
Lalgudi V. Natarajan, Air Force Research Lab. (United States)
Science Applications International Corp. (United States)
Pamela F. Lloyd, Air Force Research Lab. (United States)
UES, Inc. (United States)
Richard Sutherland, Air Force Research Lab. (United States)
Science Applications International Corp. (United States)
Richard A. Vaia, Air Force Research Lab. (United States)
Timothy J. Bunning, Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 7232:
Emerging Liquid Crystal Technologies IV
Liang-Chy Chien; Ming Hsien Wu, Editor(s)

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