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Continuous spatial tuning of laser emissions in a full visible spectral range

Title
Continuous spatial tuning of laser emissions in a full visible spectral range
Authors
Jeong M.-Y.Wu J.W.
Ewha Authors
우정원
SCOPUS Author ID
우정원scopus
Issue Date
2011
Journal Title
International Journal of Molecular Sciences
ISSN
1422-0067JCR Link
Citation
vol. 12, no. 3, pp. 2007 - 2018
Indexed
SCIE; SCOPUS WOS scopus
Abstract
In order to achieve a continuous tuning of laser emission, the authors designed and fabricated three types of cholesteric liquid crystal cells with pitch gradient, a wedge cell with positive slope, a wedge cell with negative slope, and a parallel cell. The length of the cholesteric liquid crystal pitch could be elongated up to 10 nm, allowing the lasing behavior of continuous or discontinuous spatial tuning determined by the boundary conditions of the cholesteric liquid crystal cell. In the wedge cell with positive slope, the authors demonstrated a continuous spatial laser tuning in the near full visible spectral range, with a tuning resolution less than 1 nm by pumping with only a single 355 nm laser beam. This continuous tuning behavior is due to the fact that the concentration of pitch gradient matches the fixed helical pitch determined by the cell thickness. This characteristic continuous spatial laser tuning could be confirmed again by pumping with a 532 nm laser beam, over 90 nm in the visible spectral range. The scheme of the spatial laser tuning in the wedge cell bearing a pitch gradient enabled a route to designing small-sized optical devices that allow for a wide tunability of single-mode laser emissions. © 2011 by the authors; licensee MDPI, Basel, Switzerland.
DOI
10.3390/ijms12032007
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자연과학대학 > 물리학전공 > Journal papers
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