title: Group delay locking of coherently combined broadband lasers.
abstract: We demonstrate a method for single-detector coherent sensing and automated coalignment of group delays in a coherently combined laser array, enabling robust coherent combining of broadband sources despite initial path mismatches exceeding the laser coherence length. The method is based on Fourier-domain filtering of the coherently combined laser beam to extract error signals, and it is equally applicable to controlling both spatial and temporal misalignments.
authors.affiliation: Northrop Grumman Aerospace Systems, Redondo Beach, California 90278, USA.
authors.forename: S Benjamin
authors.initials: SB
authors.lastname: Weiss
authors.forename: Mark E
authors.initials: ME
authors.lastname: Weber
authors.forename: Gregory D
authors.initials: GD
authors.lastname: Goodno