title: Free-running frequency stability of mid-infrared quantum cascade lasers.
abstract: The intrinsic frequency fluctuations of two single-mode quantum cascade (QC) distributed-feedback lasers operating continuously at a wavelength of 8.5 mum are reported. A Doppler-limited rovibrational resonance of nitrous oxide is used to transform the frequency noise into measurable intensity fluctuations. The QC lasers, along with recently improved current controllers, exhibit a free-running frequency stability of 150 kHz over a 15-ms time interval.
authors.forename: T L
authors.initials: TL
authors.lastname: Myers
authors.forename: R M
authors.initials: RM
authors.lastname: Williams
authors.forename: M S
authors.initials: MS
authors.lastname: Taubman
authors.forename: C
authors.initials: C
authors.lastname: Gmachl
authors.forename: F
authors.initials: F
authors.lastname: Capasso
authors.forename: D L
authors.initials: DL
authors.lastname: Sivco
authors.forename: J N
authors.initials: JN
authors.lastname: Baillargeon
authors.forename: A Y
authors.initials: AY
authors.lastname: Cho