title: Terahertz-bandwidth coherence measurements of a quantum dash laser in passive and active mode-locking operation.
abstract: This research carries out coherence measurements of a 42.7 GHz quantum dash (QDash) semiconductor laser when passively, electrically, and optically mode-locked. Coherence of the spectral lines from the mode-locked laser is determined by examining the radio frequency beat-tone linewidth as the mode spacing is increased up to 1.1 THz. Electric-field measurements of the QDash laser are also presented, from which a comparison between experimental results and accepted theory for coherence in passively mode-locked lasers has been performed.
authors.affiliation: The Rince Institute, Dublin City University, Glasnevin, Dublin 9, Ireland.
authors.forename: Eamonn
authors.initials: E
authors.lastname: Martin
authors.forename: Regan
authors.initials: R
authors.lastname: Watts
authors.forename: Laurent
authors.initials: L
authors.lastname: Bramerie
authors.forename: Alexandre
authors.initials: A
authors.lastname: Shen
authors.forename: Harry
authors.initials: H
authors.lastname: Gariah
authors.forename: Fabrice
authors.initials: F
authors.lastname: Blache
authors.forename: Francois
authors.initials: F
authors.lastname: Lelarge
authors.forename: Liam
authors.initials: L
authors.lastname: Barry