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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 22 — Aug. 1, 2007
  • pp: 5147–5157

Achieving Gaussian outputs from large-mode-area higher-order-mode fibers

Norbert Lindlein, Gerd Leuchs, and Siddharth Ramachandran  »View Author Affiliations

Applied Optics, Vol. 46, Issue 22, pp. 5147-5157 (2007)

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We describe an alternative to fiber-gratings for converting higher-order L P 0 m ( m > 1 ) fiber modes into a nearly fundamental Gaussian shape at the output of a fiber. This schematic enables the use of light propagation in higher-order modes of a fiber, a fiber-platform that has recently shown great promise for achieving very large mode areas needed for future high-power lasers and amplifiers. The conversion will be done by using a binary phase plate in the near field of the fiber, which emits the L P 0 m mode. Since the binary phase plate alone cannot increase the quality factor M 2 of the laser beam because of some broad sidebands, a filtering of the sidebands is done in the Fourier plane of a telescope. Of course, this will cost some of the total light power, but on the other side the M 2 factor can be reduced to nearly the ideal value near 1.0, and it is shown that 76 % of the total light power can be conserved for all investigated modes ( 2 m 8 ) . A tolerance analysis for the phase plate and its adjustment is made, and different optical imaging systems to form a magnified image of the fiber mode on the phase plate are discussed in order to have more tolerance for the adjustment of the phase plate.

© 2007 Optical Society of America

OCIS Codes
(050.1380) Diffraction and gratings : Binary optics
(060.2310) Fiber optics and optical communications : Fiber optics
(260.1960) Physical optics : Diffraction theory

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: October 9, 2006
Manuscript Accepted: April 23, 2007
Published: July 9, 2007

Norbert Lindlein, Gerd Leuchs, and Siddharth Ramachandran, "Achieving Gaussian outputs from large-mode-area higher-order-mode fibers," Appl. Opt. 46, 5147-5157 (2007)

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