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Optics Letters

Optics Letters


  • Vol. 36, Iss. 16 — Aug. 15, 2011
  • pp: 3121–3123

Active phasing a nine-element 1.14 kW all-fiber two-tone MOPA array using SPGD algorithm

Xiaolin Wang, Pu Zhou, Yanxing Ma, Jingyong Leng, Xiaojun Xu, and Zejin Liu  »View Author Affiliations

Optics Letters, Vol. 36, Issue 16, pp. 3121-3123 (2011)

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We demonstrated active phase locking a nine-element 1.14 kW all-fiber master-oscillator power amplifier (MOPA) array using the stochastic parallel gradient descent (SPGD) blind optimization algorithm. Two spectrally combined single-frequency seed lasers, which provide potential ability to suppress the stimulated Brillouin scattering effect, are employed as a master oscillator for the nine MOPA channels. The nine laser beams are tiled side by side into a 3 × 3 laser array with a fill factor of 40% in the near field. When the SPGD controller is enabled, the metric function is increased 4.1 times, and a visibility more than 90% of the interference pattern at the receiving plane is obtained. The computed phase residual error is less than λ / 15 , despite the phase fluctuation of each channel.

© 2011 Optical Society of America

OCIS Codes
(140.3280) Lasers and laser optics : Laser amplifiers
(140.3290) Lasers and laser optics : Laser arrays
(140.3510) Lasers and laser optics : Lasers, fiber

ToC Category:
Lasers and Laser Optics

Original Manuscript: April 22, 2011
Revised Manuscript: July 5, 2011
Manuscript Accepted: July 5, 2011
Published: August 10, 2011

Xiaolin Wang, Pu Zhou, Yanxing Ma, Jingyong Leng, Xiaojun Xu, and Zejin Liu, "Active phasing a nine-element 1.14 kW all-fiber two-tone MOPA array using SPGD algorithm," Opt. Lett. 36, 3121-3123 (2011)

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