Open AccessCoherent beam combination of four holmium amplifiers with phase control via a direct digital synthesizer chip
Author(s) -
Michael R. Oermann,
Neil Carmody,
Alexander Hemming,
Simon Rees,
Nikita Simakov,
Robert Swain,
Keiron Boyd,
Alan Davidson,
Leonardo Corena,
Д. В. Степанов,
John Haub
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.006715
Subject(s) - optics , amplifier , holmium , phase (matter) , beam (structure) , phase locked loop , chip , phase modulation , direct digital synthesizer , materials science , physics , phase noise , computer science , optoelectronics , cmos , laser , telecommunications , frequency synthesizer , quantum mechanics
We present the coherent beam combination of four 2100 nm holmium amplifiers with their phase controlled through acousto-optic modulators driven by the RF output of direct digital synthesizer chips. Phase alignment was achieved through the use of a field programmable gate array based stochastic parallel gradient descent algorithm.