title: Supercontinuum high-speed cavity-enhanced absorption spectroscopy for sensitive multispecies detection.
abstract: Cavity-enhanced absorption spectroscopy is promising for many applications requiring a very high concentration sensitivity but often accompanied by low temporal resolution. In this Letter, we demonstrate a broadband cavity-enhanced absorption spectrometer capable of detection rates of up to 50 kHz, based on a spatially coherent supercontinuum (SC) light source and an in-house-built, high-speed near-infrared spectrograph. The SC spectrometer allows for the simultaneous quantitative detection of CO2, C2H2, and H2O within a spectral range from 1420 to 1570 nm. Using cavity mirrors with a specified reflectivity of R=98.0±0.3% a minimal spectrally averaged absorption coefficient of αmin=1·10-5cm-1can be detected at a repetition rate of 50 kHz.
authors.forename: Thomas
authors.initials: T
authors.lastname: Werblinski
authors.forename: Bastian
authors.initials: B
authors.lastname: Lämmlein
authors.forename: Franz J T
authors.initials: FJ
authors.lastname: Huber
authors.forename: Lars
authors.initials: L
authors.lastname: Zigan
authors.forename: Stefan
authors.initials: S
authors.lastname: Will