Coherent summation of laser beams using binary phase gratings

Wilfrid B. Veldkamp, James R. Leger, Gary J. Swanson

Research output: Contribution to journalArticlepeer-review

80 Scopus citations


Method for coherent addition of lasers is presented that uses binary phase-only gratings. It is shown that a grating that splits a single beam into N equal orders with high efficiency can be used in reverse to convert N laser beams into a single beam with the same efficiency. Experiments to demonstrate the conversion of seven beams to one beam are performed with a resulting conversion efficiency of 75%. An experimental apparatus is described that adds the power from both two and three He-Ne lasers (wavelength, 3.39 µm) with efficiencies as high as 83%.

Original languageEnglish (US)
Pages (from-to)303-305
Number of pages3
JournalOptics Letters
Issue number5
StatePublished - May 1986


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