title: Phase-locked arrays of surface-emitting graded-photonic-heterostructure terahertz semiconductor lasers.
abstract: We have demonstrated that a hybrid laser array, combining graded-photonic-heterostructure terahertz semiconductor lasers with a ring resonator, allows the relative phase (either symmetric or anti-symmetric) between the sources to be fixed by design. We have successfully phase-locked up to five separate lasers. Compared with a single device, we achieved a clear narrowing of the output beam profile.
authors.forename: Yacine
authors.initials: Y
authors.lastname: Halioua
authors.forename: Gangyi
authors.initials: G
authors.lastname: Xu
authors.forename: Souad
authors.initials: S
authors.lastname: Moumdji
authors.forename: Lianhe
authors.initials: L
authors.lastname: Li
authors.forename: Jingxuan
authors.initials: J
authors.lastname: Zhu
authors.forename: Edmund H
authors.initials: EH
authors.lastname: Linfield
authors.forename: A Giles
authors.initials: AG
authors.lastname: Davies
authors.forename: Harvey E
authors.initials: HE
authors.lastname: Beere
authors.forename: David A
authors.initials: DA
authors.lastname: Ritchie
authors.forename: Raffaele
authors.initials: R
authors.lastname: Colombelli