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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 19 — Jul. 1, 2011
  • pp: 3330–3336

Active phase locking of fiber amplifiers using sine–cosine single-frequency dithering technique

Yanxing Ma, Pu Zhou, Xiaolin Wang, Haotong Ma, Xiaojun Xu, Lei Si, Zejin Liu, and Yijun Zhao  »View Author Affiliations

Applied Optics, Vol. 50, Issue 19, pp. 3330-3336 (2011)

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The sine–cosine single-frequency dithering technique for active phase locking of fiber amplifiers is presented for the first time to our knowledge. It has twice the phase control speed as the single-frequency dithering technique. Detailed theoretical development has been presented and the relevant experiment has been done. In the experiment, nine 10 W level fiber amplifiers are tiled into 3 × 3 array and the total output power is about 100 W . The sine–cosine single-frequency dithering algorithm is run on a signal processor based on a field-programmable gate array for phase control on the fiber amplifiers. When the phase control system is in a closed loop, the fringe contrast of far-field intensity pattern is improved by more than 90% from 21% in an open loop, and the residual phase error is less than λ / 20 .

© 2011 Optical Society of America

OCIS Codes
(140.3290) Lasers and laser optics : Laser arrays
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.3298) Lasers and laser optics : Laser beam combining

ToC Category:
Lasers and Laser Optics

Original Manuscript: February 3, 2011
Revised Manuscript: May 11, 2011
Manuscript Accepted: May 11, 2011
Published: July 1, 2011

Yanxing Ma, Pu Zhou, Xiaolin Wang, Haotong Ma, Xiaojun Xu, Lei Si, Zejin Liu, and Yijun Zhao, "Active phase locking of fiber amplifiers using sine–cosine single-frequency dithering technique," Appl. Opt. 50, 3330-3336 (2011)

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