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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 14 — Jul. 2, 2012
  • pp: 14945–14953

Automated co-alignment of coherent fiber laser arrays via active phase-locking

Gregory D. Goodno and S. Benjamin Weiss  »View Author Affiliations


Optics Express, Vol. 20, Issue 14, pp. 14945-14953 (2012)
http://dx.doi.org/10.1364/OE.20.014945


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Abstract

We demonstrate a novel closed-loop approach for high-precision co-alignment of laser beams in an actively phase-locked, coherently combined fiber laser array. The approach ensures interferometric precision by optically transducing beam-to-beam pointing errors into phase errors on a single detector, which are subsequently nulled by duplication of closed-loop phasing controls. Using this approach, beams from five coherent fiber tips were simultaneously phase-locked and position-locked with sub-micron accuracy. Spatial filtering of the sensed light is shown to extend the control range over multiple beam diameters by recovering spatial coherence despite the lack of far-field beam overlap.

© 2012 OSA

OCIS Codes
(140.3290) Lasers and laser optics : Laser arrays
(140.3298) Lasers and laser optics : Laser beam combining

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: May 2, 2012
Manuscript Accepted: June 6, 2012
Published: June 19, 2012

Citation
Gregory D. Goodno and S. Benjamin Weiss, "Automated co-alignment of coherent fiber laser arrays via active phase-locking," Opt. Express 20, 14945-14953 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-14-14945


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References

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