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Folding flexible co-extruded all-polymer multilayer distributed feedback films to control lasing.

Authors
  • Andrews, James H1
  • Crescimanno, Michael
  • Dawson, Nathan J
  • Mao, Guilin
  • Petrus, Joshua B
  • Singer, Kenneth D
  • Baer, Eric
  • Song, Hyunmin
  • 1 Dept. of Physics & Astronomy, Youngstown State Univ., Youngstown, Ohio 44555, USA. [email protected]
Type
Published Article
Journal
Optics Express
Publisher
The Optical Society
Publication Date
Jul 02, 2012
Volume
20
Issue
14
Pages
15580–15588
Identifiers
DOI: 10.1364/OE.20.015580
PMID: 22772253
Source
Medline
License
Unknown

Abstract

We report on improved gain and spectral control in co-extruded all-polymer multilayer distributed feedback (DFB) lasers achieved by folding and deliberate modification of the center "defect" layer. Because DFB laser gain is greater at spectral defects inside the reflection band than at the band edges, manipulation of structural defects can be used to alter spectral defects and thereby tune the output wavelength and improve laser efficiency. By experimentally terracing the layer that becomes the center of the fold, we tuned the lasing wavelength across the reflection stop-band (∼25 nm) in controllable, discrete steps. The increased density of states associated with the defect resulted in a lower lasing threshold and, typically, a 3- to 6-fold increase in lasing efficiency over non-folded samples.

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