High efficiency coherent beam combining of semiconductor optical amplifiers

We demonstrate 40 W coherently combined output power in a single diffraction-limited beam from a one-dimensional 47-element array of angled-facet slab-coupled optical waveguide amplifiers at 1064 nm. The output from each emitter was collimated and overlapped onto a diffractive optical element combin...

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Bibliographic Details
Published in:Optics letters 2012-12, Vol.37 (23), p.5006-5008
Main Authors: Creedon, Kevin J, Redmond, Shawn M, Smith, Gary M, Missaggia, Leo J, Connors, Michael K, Kansky, Jan E, Fan, Tso Yee, Turner, George W, Sanchez-Rubio, Antonio
Format: Article
Language:English
Subjects:
Amplification
Arrays
Beams (radiation)
Coherence
Diffraction
Diffractive optical elements
Semiconductor optical amplifiers
Transforms
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Summary:We demonstrate 40 W coherently combined output power in a single diffraction-limited beam from a one-dimensional 47-element array of angled-facet slab-coupled optical waveguide amplifiers at 1064 nm. The output from each emitter was collimated and overlapped onto a diffractive optical element combiner using a common transform lens. Phase locking was achieved via active feedback on each amplifier's drive current to maximize the power in the combined beam. The combining efficiency at all current levels was nearly constant at 87%.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.37.005006