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

Gregory D. Goodno, S. Benjamin Weiss

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


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 closedloop 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.

Original languageEnglish
Pages (from-to)14945-14953
Number of pages9
JournalOptics Express
Issue number14
StatePublished - 2 Jul 2012
Externally publishedYes


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