title: Self-referenced, accurate and sensitive optical frequency comb spectroscopy with a virtually imaged phased array spectrometer.
abstract: We present a cavity-enhanced direct optical frequency comb spectroscopy system with a virtually imaged phased array (VIPA) spectrometer and either a dither or a Pound-Drever-Hall (PDH) locking scheme used for stable transmission of the comb through the cavity. A self-referenced scheme for frequency axis calibration is shown along with an analysis of its accuracy. A careful comparison between both locking schemes is performed based on near-IR measurements of the carbon monoxide ν=3←0 band P branch transitions in a gas sample with known composition. The noise-equivalent absorptions (NEA) for the PDH and dither schemes are 9.9×10(-10) cm(-1) and 5.3×10(-9) cm(-1), respectively.
authors.forename: Grzegorz
authors.initials: G
authors.lastname: Kowzan
authors.forename: Kevin F
authors.initials: KF
authors.lastname: Lee
authors.forename: Magdalena
authors.initials: M
authors.lastname: Paradowska
authors.forename: Mateusz
authors.initials: M
authors.lastname: Borkowski
authors.forename: Piotr
authors.initials: P
authors.lastname: Ablewski
authors.forename: Szymon
authors.initials: S
authors.lastname: Wójtewicz
authors.forename: Kamila
authors.initials: K
authors.lastname: Stec
authors.forename: Daniel
authors.initials: D
authors.lastname: Lisak
authors.forename: Martin E
authors.initials: ME
authors.lastname: Fermann
authors.forename: Ryszard S
authors.initials: RS
authors.lastname: Trawiński
authors.forename: Piotr
authors.initials: P
authors.lastname: Masłowski