title: Differential absorption measurement of methane with two spatially resolved laser lines.
abstract: Simultaneous and independent lasing on two different atomic lines is achieved with spatial resolution of laser eigenstates in conjunction with intracavity frequency selection. A sensitivity of 0.3 part in 10(6) meter in the differential detection of methane in 1 atm of air is experimentally demonstrated with this novel dual-wavelength laser. Monitoring the output intensities of the two orthogonally polarized eigenstates permits absolute measurement of methane concentration.
authors.forename: D
authors.initials: D
authors.lastname: Jacob
authors.forename: N H
authors.initials: NH
authors.lastname: Tran
authors.forename: F
authors.initials: F
authors.lastname: Bretenaker
authors.forename: A L
authors.initials: AL
authors.lastname: Floch