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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 15 — Jul. 29, 2013
  • pp: 17999–18010

Thermal-induced two dimensional beam distortion in planar waveguide amplifiers

Xiao-Jun Wang, Wei-Wei Ke, and Hua Su  »View Author Affiliations

Optics Express, Vol. 21, Issue 15, pp. 17999-18010 (2013)

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Mode characteristics in the solid-state planar waveguide (PWG) laser amplifiers are investigated theoretically, in consideration of the temperature gradient generated by cooling across the thickness and by pumping inhomogeneity along the width direction. When variation of the refractive index along the width direction is dominated by the lower spatial frequencies, the vector wave equation is solved analytically by means of the perturbation method. It is similar to the zigzag slab amplifier in which the phase aberration depending on the width coordinate plays the most important role to cause degradation of the beam quality. The crossing mode distortions owing to two dimension nature of the index variations are illustrated, and that mode profile is varied by the index variation along both the thickness and the width directions. Modes in the single-mode or the few-mode PWGs are shown to suffer weaker thermal-induced distortion across the thickness than those in the multi-mode PWGs.

© 2013 OSA

OCIS Codes
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.6810) Lasers and laser optics : Thermal effects
(230.7390) Optical devices : Waveguides, planar
(140.3295) Lasers and laser optics : Laser beam characterization

ToC Category:
Lasers and Laser Optics

Original Manuscript: April 22, 2013
Revised Manuscript: July 8, 2013
Manuscript Accepted: July 11, 2013
Published: July 19, 2013

Xiao-Jun Wang, Wei-Wei Ke, and Hua Su, "Thermal-induced two dimensional beam distortion in planar waveguide amplifiers," Opt. Express 21, 17999-18010 (2013)

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