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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 13 — Jun. 18, 2012
  • pp: 14604–14613

Self-focusing length in highly multimode ultra-large-mode-area fibers

Huang Zhihua, Wang Jianjun, Lin Honghuan, Xu Dangpeng, Zhang Rui, Li Mingzhong, and Wei Xiaofeng  »View Author Affiliations

Optics Express, Vol. 20, Issue 13, pp. 14604-14613 (2012)

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Recent theoretical researches reveal that the self-focusing critical power in the fiber waveguide is identical to that in the bulk medium. However, the delivery of peak power much higher than the self-focusing critical power has been demonstrated experimentally in ultra-large-mode-area fiber (ULMAF). And no experimental observation of self-focusing effect has been reported in recent pulsed fiber laser system whose peak power has reached or even exceeded the critical power. In this paper, we try to address this issue by studying the self-focusing length theoretically in the ULMAF which is highly multimode. Nonlinear beam propagation method employing PÁDE(2,2) approximation is applied in the numerical simulation. The results show that the self-focusing length of the fundamental mode is typically a few millimeters which is almost identical to that in the bulk medium. However, the self-focusing length of the summation of numerous modes can be as long as a few meters.

© 2012 OSA

OCIS Codes
(190.4370) Nonlinear optics : Nonlinear optics, fibers
(260.5950) Physical optics : Self-focusing
(060.3510) Fiber optics and optical communications : Lasers, fiber

ToC Category:
Nonlinear Optics

Original Manuscript: May 7, 2012
Revised Manuscript: May 30, 2012
Manuscript Accepted: May 31, 2012
Published: June 15, 2012

Huang Zhihua, Wang Jianjun, Lin Honghuan, Xu Dangpeng, Zhang Rui, Li Mingzhong, and Wei Xiaofeng, "Self-focusing length in highly multimode ultra-large-mode-area fibers," Opt. Express 20, 14604-14613 (2012)

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