title: Characterization of an external cavity diode laser based ring cavity NICE-OHMS system.
abstract: The performance of an external cavity diode laser based noise immune cavity enhanced optical heterodyne molecular spectrometer is presented. To reduce the noise on the signal a ring cavity and a circuit to remove residual amplitude modulation on the pre-cavity laser radiation was implemented. We demonstrate a sensitivity of 4 x 10(-11) cm(-1) Hz(-1/2) using a cavity with a finesse of 2600 on a Doppler-broadened transition of CH(4) at 6610.063 cm(-1).
authors.affiliation: Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford, UK.
authors.forename: C L
authors.initials: CL
authors.lastname: Bell
authors.forename: G
authors.initials: G
authors.lastname: Hancock
authors.forename: R
authors.initials: R
authors.lastname: Peverall
authors.forename: G A D
authors.initials: GA
authors.lastname: Ritchie
authors.forename: J H
authors.initials: JH
authors.lastname: van Helden
authors.forename: N J
authors.initials: NJ
authors.lastname: van Leeuwen
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D054023:Lasers, Semiconductor; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers