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Ultra-broadband quantum cascade laser, tunable over 760 cm, with balanced gain

Optics Express, ISSN: 1094-4087, Vol: 23, Issue: 16, Page: 21159-21164
2015
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Ultra-Broadband Lasers for Portable Chemical Sensors

New quantum cascade laser design is lightweight, powerful and operates at room temperature.

Article Description

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, 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.

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