title: Single-mode high-power interband cascade lasers for mid-infrared absorption spectroscopy.
abstract: For high-sensitivity absorption spectroscopy, single-mode light sources capable of emitting high optical output power in the 3 to 5 µm wavelength range are vital. Here, we report on interband cascade lasers that emit 20 mW of optical power in a single spectral mode at room temperature and up to 40 mW at 0 °C using second-order laterally coupled Bragg gratings for distributed feedback. The lasers employ a double-ridge design with a narrow 3-µm-wide top ridge to confine the optical mode and a 9-µm-wide ridge for current confinement. The lasers were developed for an integrated cavity output spectroscopy instrument for stratospheric detection of hydrogen chloride at a wavelength of 3.3746 µm and emit at the target wavelength with more than 34 mW of single-mode power.
authors.forename: Carl
authors.initials: C
authors.lastname: Borgentun
authors.forename: Clifford
authors.initials: C
authors.lastname: Frez
authors.forename: Ryan M
authors.initials: RM
authors.lastname: Briggs
authors.forename: Mathieu
authors.initials: M
authors.lastname: Fradet
authors.forename: Siamak
authors.initials: S
authors.lastname: Forouhar