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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 12 — Jun. 17, 2013
  • pp: 14272–14281

Thermally induced mode distortion and its limit to power scaling of fiber lasers

Wei-Wei Ke, Xiao-Jun Wang, Xian-Feng Bao, and Xiao-Jian Shu  »View Author Affiliations

Optics Express, Vol. 21, Issue 12, pp. 14272-14281 (2013)

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A general model is proposed to describe thermal-induced mode distortion in the step-index fiber (SIF) high power lasers. Two normalized parameters in the model are able to determine the mode characteristic in the heated SIFs completely. Shrinking of the mode fields and excitation of the high-order modes by the thermal-optic effect are investigated. A simplified power amplification model is used to describe the output power redistribution under various guiding modes. The results suggest that fiber with large mode area is more sensitive on the thermally induced mode distortion and hence is disadvantaged in keeping the beam quality in high power operation. The model is further applied to improve the power scaling analysis of Yb-doped fiber lasers. Here the thermal effect is considered to couple with the optical damage and the stimulated Raman scattering dynamically, whereas direct constraint from the thermal lens is relaxed. The resulting maximal output power is from 67kW to 97kW, depending on power fraction of the fundamental mode.

© 2013 OSA

OCIS Codes
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(140.6810) Lasers and laser optics : Thermal effects
(140.3615) Lasers and laser optics : Lasers, ytterbium

ToC Category:
Lasers and Laser Optics

Original Manuscript: February 25, 2013
Revised Manuscript: May 24, 2013
Manuscript Accepted: May 29, 2013
Published: June 7, 2013

Wei-Wei Ke, Xiao-Jun Wang, Xian-Feng Bao, and Xiao-Jian Shu, "Thermally induced mode distortion and its limit to power scaling of fiber lasers," Opt. Express 21, 14272-14281 (2013)

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