title: Frequency stabilization of a single mode terahertz quantum cascade laser to the kilohertz level.
abstract: A simple analog locking circuit was shown to stabilize the beat signal between a 2.408 THz quantum cascade laser and a CH(2)DOH THz CO(2) optically pumped molecular laser to 3-4 kHz (FWHM). This is approximately a tenth of the observed long-term (t approximately sec) linewidth of the optically pumped laser showing that the feedback loop corrects for much of the mechanical and acoustic-induced frequency jitter of the gas laser. The achieved stability should be sufficient to enable the use of THz quantum cascade lasers as transmitters in short-range coherent transceivers.
authors.affiliation: Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA. Andriy_Danylov@student.uml.edu
authors.forename: Andriy A
authors.initials: AA
authors.lastname: Danylov
authors.forename: Thomas M
authors.initials: TM
authors.lastname: Goyette
authors.forename: Jerry
authors.initials: J
authors.lastname: Waldman
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Coulombe
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Gatesman
authors.forename: Robert H
authors.initials: RH
authors.lastname: Giles
authors.forename: William D
authors.initials: WD
authors.lastname: Goodhue
authors.forename: Xifeng
authors.initials: X
authors.lastname: Qian
authors.forename: William E
authors.initials: WE
authors.lastname: Nixon
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005246:Feedback; D054023:Lasers, Semiconductor; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D055053:Terahertz Radiation