OSA's Digital Library

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)

View Full Text Article

Enhanced HTML    Acrobat PDF (1047 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools



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

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

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)

Sort:  Author  |  Year  |  Journal  |  Reset  


  1. C. X. Yu and T. Y. Fan, “Beam combining,” in High Power Laser Handbook, H. Injeyan and G. D. Goodno, eds (McGraw Hill, 2011), pp. 533–571.
  2. G. D. Goodno, C. C. Shih, and J. E. Rothenberg, “Perturbative analysis of coherent combining efficiency with mismatched lasers,” Opt. Express18(24), 25403–25414 (2010). [CrossRef] [PubMed]
  3. S. M. Redmond, T. Y. Fan, D. Ripin, P. Thielen, J. Rothenberg, and G. Goodno, “Diffractive beam combining of a 2.5-kW fiber laser array,” in Lasers, Sources, and Related Photonic Devices, OSA Technical Digest (CD) (Optical Society of America, 2012), paper AM3A.1.
  4. T. R. O’Meara, “The multidither principle in adaptive optics,” J. Opt. Soc. Am.67(3), 306–314 (1977). [CrossRef]
  5. T. M. Shay, “Theory of electronically phased coherent beam combination without a reference beam,” Opt. Express14(25), 12188–12195 (2006). [CrossRef] [PubMed]
  6. M. A. Vorontsov and V. P. Sivokon, “Stochastic parallel-gradient-descent technique for high-resolution wave-front phase-distortion correction,” J. Opt. Soc. Am. A15(10), 2745–2758 (1998). [CrossRef]
  7. M. A. Vorontsov, T. Weyrauch, L. A. Beresnev, G. W. Carhart, L. Liu, and K. Aschenbach, “Adaptive array of phase-locked fiber collimators: analysis and experimental demonstration,” IEEE J. Sel. Topics Quantum Electron.15, 269–280 (2009).
  8. S. B. Weiss, M. E. Weber, and G. D. Goodno, “Group delay locking of coherently combined broadband lasers,” Opt. Lett.37(4), 455–457 (2012). [CrossRef] [PubMed]
  9. R. Uberna, A. Bratcher, and B. G. Tiemann, “Coherent polarization beam combination,” IEEE J. Quantum Electron.46(8), 1191–1196 (2010). [CrossRef]
  10. B. N. Pulford, “LOCSET phase locking: operation, diagnostics, and applications,” Ph.D. dissertation (Univ. of New Mexico, 2011).

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

Supplementary Material

» Media 1: AVI (1477 KB)     
» Media 2: AVI (958 KB)     

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited