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Tunable distributed feedback lasing from leaky waveguides based on gel-glass dispersed liquid crystal thin films

Authors
Journal
Materials Letters
0167-577X
Publisher
Elsevier
Publication Date
Volume
65
Identifiers
DOI: 10.1016/j.matlet.2011.07.070
Keywords
  • Sol–Gel Preparation
  • Thin Films
  • Distributed Feedback Laser
  • Gel–Glass Dispersed Liquid Crystal
Disciplines
  • Mathematics

Abstract

Abstract Different amount of nematic liquid crystal (LC) 4-Cyano-4′-pentylbiphenyl(5CB) was encapsulated in sol–gel derived organically modified silica(ORMOSIL) matrices to fabricate dye doped gel-glass dispersed liquid crystal (GDLC) thin films by co-hydrolyzation/condensation of ethyl triethoxisilane (ETES) and tetraethyl orthosilicate (TEOS) precursors. Distributed feedback (DFB) leaky waveguide lasers from GDLC thin films using a dynamic grating were demonstrated. Tunable laser action from 558 to 570 nm was obtained in the sample with lowest LC concentration of 0.375 mol%. The DFB laser performance of GDLC thin films with various LC concentrations was investigated using the same pumping geometry, and it was shown that the encapsulation of 5CB also led to the red shift of lasing peak.

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