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Proceedings Paper

All-fiber laser beam shaping at 1.0 μm wavelength region in a single-mode fiber
Author(s): Xijia Gu; Waleed Mohammed; Li Qian; Peter W. E. Smith
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Paper Abstract

Laser beam shaping is an important subject in industrial and medical applications of lasers since different applications may require different laser intensity distributions. Recently we demonstrated successfully an all-fiber laser beam shaping device that could transform a Gaussian shaped laser beam into a uniform or ring-shaped beam in 1.5 μm wavelength region. In this paper we present the work of the beam shaping in 1.0 μm wavelength region to make it compatible to Yb-doped high power fiber laser. The device uses a long-period grating to couple a portion of core-mode, LP01 into a low-order mth-radial cladding mode LP0m. Interference of the two modes could reduce field at the centre and enhance the field in the first or second ring of the cladding mode to transform the Gaussian-shaped laser beam to an intensity uniform beam. The design parameters that affect the beam shaping will be discussed and the results of the interference from two cladding modes, LP03 and LP04 will be presented.

Paper Details

Date Published: 11 August 2008
PDF: 5 pages
Proc. SPIE 7099, Photonics North 2008, 70990L (11 August 2008); doi: 10.1117/12.804764
Show Author Affiliations
Xijia Gu, Ryerson Univ. (Canada)
Waleed Mohammed, Chulalongkorn Univ. (Thailand)
Li Qian, Univ. of Toronto (Canada)
Peter W. E. Smith, Univ. of Toronto (Canada)

Published in SPIE Proceedings Vol. 7099:
Photonics North 2008
Réal Vallée; Michel Piché; Peter Mascher; Pavel Cheben; Daniel Côté; Sophie LaRochelle; Henry P. Schriemer; Jacques Albert; Tsuneyuki Ozaki, Editor(s)

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