title: Integrated injection seeded terahertz source and amplifier for time-domain spectroscopy.
abstract: We used a terahertz (THz) quantum cascade laser (QCL) as an integrated injection seeded source and amplifier for THz time-domain spectroscopy. A THz input pulse is generated inside a QCL by illuminating the laser facet with a near-IR pulse from a femtosecond laser and amplified using gain switching. The THz output from the QCL is found to saturate upon increasing the amplitude of the THz input power, which indicates that the QCL is operating in an injection seeded regime.
authors.affiliation: Laboratoire Pierre Aigrain, Ecole Normale Supérieure, CNRS (UMR 8551), Université Pierre et Marie Curie, Université D. Diderot, Paris, France.
authors.forename: J
authors.initials: J
authors.lastname: Maysonnave
authors.forename: N
authors.initials: N
authors.lastname: Jukam
authors.forename: M S M
authors.initials: MS
authors.lastname: Ibrahim
authors.forename: K
authors.initials: K
authors.lastname: Maussang
authors.forename: J
authors.initials: J
authors.lastname: Madéo
authors.forename: P
authors.initials: P
authors.lastname: Cavalié
authors.forename: P
authors.initials: P
authors.lastname: Dean
authors.forename: S P
authors.initials: SP
authors.lastname: Khanna
authors.forename: D P
authors.initials: DP
authors.lastname: Steenson
authors.forename: E H
authors.initials: EH
authors.lastname: Linfield
authors.forename: A G
authors.initials: AG
authors.lastname: Davies
authors.forename: J
authors.initials: J
authors.lastname: Tignon
authors.forename: S S
authors.initials: SS
authors.lastname: Dhillon