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.
Original language | English (US) |
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Pages (from-to) | 21159-21164 |
Number of pages | 6 |
Journal | Optics Express |
Volume | 23 |
Issue number | 16 |
DOIs | |
State | Published - Aug 10 2015 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics