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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 12, Iss. 25 — Dec. 13, 2004
  • pp: 6230–6239

Fundamental mode operation of a 19-core phase-locked Yb-doped fiber amplifier

Yanming Huo, Peter K. Cheo, and George G. King  »View Author Affiliations

Optics Express, Vol. 12, Issue 25, pp. 6230-6239 (2004)

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We demonstrate, theoretically and experimentally, a high power/energy 19-core Yb-doped fiber amplifier that operates in its fundamental in-phase mode. The calculated result using an improved coupled mode theory with gain shows that, with a Gaussian beam as seed, the in-phase supermode dominates. Experimentally, we use a Q-switched single-core fiber laser with single transverse mode as seed, and amplify it with a 5.8 m 19-core fiber. The measured near and far fields are close to the in-phase supermode. The measured M2 factor of the amplified beam is 1.5, which is close to the theoretical value. A pulse energy gain of 20 dB is obtained with the amplified pulse energy up to 0.65 mJ at a repetition frequency of 5 kHz. No appreciable stimulated Brillouin scattering is observed at this power level.

© 2004 Optical Society of America

OCIS Codes
(030.4070) Coherence and statistical optics : Modes
(140.3280) Lasers and laser optics : Laser amplifiers
(140.3290) Lasers and laser optics : Laser arrays
(140.3510) Lasers and laser optics : Lasers, fiber
(140.4480) Lasers and laser optics : Optical amplifiers

ToC Category:
Research Papers

Original Manuscript: November 2, 2004
Revised Manuscript: November 30, 2004
Published: December 13, 2004

Yanming Huo, Peter Cheo, and George King, "Fundamental mode operation of a 19-core phase-locked Yb-doped fiber amplifier," Opt. Express 12, 6230-6239 (2004)

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