Publications
High efficiency coherent beam combining of semiconductor optical amplifiers
Summary
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...
External cavity beam combining of 21 semiconductor lasers using SPGD
Summary
Summary
Active coherent beam combining of laser oscillators is an attractive way to achieve high output power in a diffraction limited beam. Here we describe an active beam combining system used to coherently combine 21 semiconductor laser elements with an 81% beam combining efficiency in an external cavity configuration compared with...
Beam combining of quantum cascade laser arrays
Summary
Summary
Wavelength beam combining was used to co-propagate beams from 28 elements in an array of distributed-feedback quantum cascade lasers (DFB-QCLs). The beam-quality product of the array, defined as the product of near-field spot size and far-field divergence for the entire array, was improved by a factor of 21 by using...
Coherent beam combining of large number of PM fibres in 2-D fibre array
Summary
Summary
Coherent combining of a record 48 PM fibres in a phased array configuration is reported. The resulting Strehl ratio degrades by