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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 10 — May. 20, 2013
  • pp: 12617–12628

Polarization characteristics of Whispering-Gallery-Mode fiber lasers based on evanescent-wave-coupled gain

Yuan-Xian Zhang, Xiao-Yun Pu, Li Feng, De-Yu Han, and Yi-Tao Ren  »View Author Affiliations

Optics Express, Vol. 21, Issue 10, pp. 12617-12628 (2013)

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The polarization characteristics of Whispering-Gallery-Mode (WGM) fiber lasers based on evanescent-wave-coupled gain are investigated. For the laser gain is excited by side-pumping scheme, it is found that the polarization property of lasing emission is simply dependent on the polarized states of the pump beams. The polarization property of lasing emission depends on the propagating situation of the pump beams in an optical fiber if the laser gain is excited by evanescent-wave pumping scheme, that is, if the pump beams within the fiber are meridional beams, the lasing emission is a transverse electric (TE) wave that forms a special radial polarization emission. However, if the pump beams within the fiber are skew beams, both transverse magnetic (TM) and TE waves exist simultaneously in lasing emission that forms a special axially and radially mixed polarization emission. Pumped by skew beams, the wave-number differences between TE and TM waves are also investigated quantitatively, the results demonstrate that the wave-number difference decreases with the increase of the fiber diameter and the refractive index (RI) of the cladding solution. The observed polarization characteristics have been well explained based on lasing radiation mechanism of WGM fiber laser of gain coupled by evanescent wave.

© 2013 OSA

OCIS Codes
(140.2050) Lasers and laser optics : Dye lasers
(140.3430) Lasers and laser optics : Laser theory
(140.3510) Lasers and laser optics : Lasers, fiber
(140.3948) Lasers and laser optics : Microcavity devices

ToC Category:
Lasers and Laser Optics

Original Manuscript: April 3, 2013
Manuscript Accepted: May 2, 2013
Published: May 15, 2013

Yuan-Xian Zhang, Xiao-Yun Pu, Li Feng, De-Yu Han, and Yi-Tao Ren, "Polarization characteristics of Whispering-Gallery-Mode fiber lasers based on evanescent-wave-coupled gain," Opt. Express 21, 12617-12628 (2013)

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