title: Continuous wave operation of a superlattice quantum cascade laser emitting at 2 THz.
abstract: We report the operation of a 2 THz quantum cascade laser based on a GaAs/Al(0.1)Ga(0.9)As heterostructure. The laser transition is between an isolated subband and the upper state of a 14 meV wide miniband. Lasing action takes place on a high order vertical mode of a 200 microm thick double-metallic waveguide. In pulsed mode operation, with a 3.16mm long device, we report a threshold current density of 115 A/cm(2) at T = 4K, with a maximum measured peak power of 50 mW. The device shows lasing action in continuous wave up to 47K, with a maximum power in excess of 15 mW at T = 4K.
authors.forename: Chris
authors.initials: C
authors.lastname: Worrall
authors.forename: Jesse
authors.initials: J
authors.lastname: Alton
authors.forename: Mark
authors.initials: M
authors.lastname: Houghton
authors.forename: Stefano
authors.initials: S
authors.lastname: Barbieri
authors.forename: Harvey E
authors.initials: HE
authors.lastname: Beere
authors.forename: David
authors.initials: D
authors.lastname: Ritchie
authors.forename: Carlo
authors.initials: C
authors.lastname: Sirtori