400-W near diffraction-limited single-frequency all-solid photonic bandgap fiber amplifier

An ytterbium-doped large-mode area photonic bandgap fiber is used to demonstrate 400 W of single-frequency output at 1064 nm with excellent beam quality and minimal stimulated Brillouin scattering. The fiber possesses all-solid microstructures embedded in the cladding and a core composed of phosphos...

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Bibliographic Details
Published in:Optics letters 2015-05, Vol.40 (10), p.2297-2300
Main Authors: Pulford, Benjamin, Ehrenreich, Thomas, Holten, Roger, Kong, Fanting, Hawkins, Thomas W, Dong, Liang, Dajani, Iyad
Format: Article
Language:English
Subjects:
Amplification
Beams (radiation)
Diffraction
Energy gaps (solid state)
Fibers
Photon beams
Photonic band gaps
Photonics
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Summary:An ytterbium-doped large-mode area photonic bandgap fiber is used to demonstrate 400 W of single-frequency output at 1064 nm with excellent beam quality and minimal stimulated Brillouin scattering. The fiber possesses all-solid microstructures embedded in the cladding and a core composed of phosphosilicate with a diameter of ∼50  μm. As the signal power is pushed beyond 450 W, there is degradation in the beam quality due to the modal instability. We briefly discuss techniques to alleviate this problem in future designs. To the best of our knowledge, the 400-W single-frequency near diffraction-limited output far exceeds the current state-of-the-art from such type of fiber amplifier.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.40.002297