title: Terahertz quantum cascade laser as local oscillator in a heterodyne receiver.
abstract: Terahertz quantum cascade lasers have been investigated with respect to their performance as a local oscillator in a heterodyne receiver. The beam profile has been measured and transformed in to a close to Gaussian profile resulting in a good matching between the field patterns of the quantum cascade laser and the antenna of a superconducting hot electron bolometric mixer. Noise temperature measurements with the hot electron bolometer and a 2.5 THz quantum cascade laser yielded the same result as with a gas laser as local oscillator.
authors.forename: Heinz-Wilhelm
authors.initials: HW
authors.lastname: Hübers
authors.forename: S
authors.initials: S
authors.lastname: Pavlov
authors.forename: A
authors.initials: A
authors.lastname: Semenov
authors.forename: R
authors.initials: R
authors.lastname: Köhler
authors.forename: L
authors.initials: L
authors.lastname: Mahler
authors.forename: A
authors.initials: A
authors.lastname: Tredicucci
authors.forename: H
authors.initials: H
authors.lastname: Beere
authors.forename: D
authors.initials: D
authors.lastname: Ritchie
authors.forename: E
authors.initials: E
authors.lastname: Linfield