title: Low-dissipation 7.4-µm single-mode quantum cascade lasers without epitaxial regrowth.
abstract: We report continuous-wave operation of single-mode quantum cascade (QC) lasers emitting near 7.4 µm with threshold power consumption below 1 W at temperatures up to 40 °C. The lasers were fabricated with narrow, plasma-etched waveguides and distributed-feedback sidewall gratings clad with sputtered aluminum nitride. In contrast to conventional buried-heterostructure (BH) devices with epitaxial sidewall cladding and in-plane gratings, the devices described here were fabricated without any epitaxial regrowth processes, yet they exhibit power consumption comparable to the lowest-dissipation BH QC lasers reported to date. These low-dissipation devices are designed primarily as light sources for infrared spectroscopy instruments with limited volume, mass, and power budgets.
authors.forename: Ryan M
authors.initials: RM
authors.lastname: Briggs
authors.forename: Clifford
authors.initials: C
authors.lastname: Frez
authors.forename: Mathieu
authors.initials: M
authors.lastname: Fradet
authors.forename: Siamak
authors.initials: S
authors.lastname: Forouhar
authors.forename: Romain
authors.initials: R
authors.lastname: Blanchard
authors.forename: Laurent
authors.initials: L
authors.lastname: Diehl
authors.forename: Christian
authors.initials: C
authors.lastname: Pflügl