title: Ultra-broadband quantum cascade laser, tunable over 760 cm(-1), with balanced gain.
abstract: A heterogeneous quantum cascade laser, consisting of multiple stacks of discrete wavelength quantum cascade stages, emitting in 5.9-10.9 µm, wavelength range is reported. The broadband characteristics are demonstrated with a distributed-feedback laser array, emitting at fixed frequencies at room temperature, covering an emission range of ~760 cm(-1), which is ~59% relative to the center frequency. By appropriate choice of a strained AlInAs/GaInAs material system, quantum cascade stage design and spatial arrangement of stages, the distributed-feedback array has been engineered to exhibit a flat threshold current density across the demonstrated range.
authors.forename: N
authors.initials: N
authors.lastname: Bandyopadhyay
authors.forename: M
authors.initials: M
authors.lastname: Chen
authors.forename: S
authors.initials: S
authors.lastname: Sengupta
authors.forename: S
authors.initials: S
authors.lastname: Slivken
authors.forename: M
authors.initials: M
authors.lastname: Razeghi