All-fiber laser beam shaping at 1.0 &#956;m wavelength region in a single-mode fiber

Xijia Gu; Waleed Mohammed; Li Qian; Peter W. E. Smith

doi:10.1117/12.804764

11 August 2008 All-fiber laser beam shaping at 1.0 μm wavelength region in a single-mode fiber

Xijia Gu, Waleed Mohammed, Li Qian, Peter W. E. Smith

Proceedings Volume 7099, Photonics North 2008; 70990L (2008) https://doi.org/10.1117/12.804764
Event: Photonics North 2008, 2008, Montréal, Canada

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 m^th-radial cladding mode LP_0m. 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.

Citation Download Citation

Xijia Gu, Waleed Mohammed, Li Qian, and Peter W. E. Smith "All-fiber laser beam shaping at 1.0 μm wavelength region in a single-mode fiber", Proc. SPIE 7099, Photonics North 2008, 70990L (11 August 2008); https://doi.org/10.1117/12.804764

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