title: Near infrared frequency comb vernier spectrometer for broadband trace gas detection.
abstract: We present a femtosecond frequency comb vernier spectrometer in the near infrared with a femtosecond Er doped fiber laser, a scanning high-finesse cavity and an InGaAs camera. By utilizing the properties of a frequency comb and a scanning high-finesse cavity such a spectrometer provides broad spectral bandwidth, high spectral resolution, and high detection sensitivity on a short time scale. We achieved an absorption sensitivity of ~8 × 10(-8) cm(-1)Hz(-1/2), corresponding to a detection limit of ~70 ppbv for acetylene, with a resolution of ~1.1 GHz in single images taken in 0.5 seconds and covering a frequency range of ~5 THz. Such measurements have broad applications for sensing greenhouse gases in this fingerprint near infrared region with a simple apparatus.
authors.forename: Feng
authors.initials: F
authors.lastname: Zhu
authors.forename: James
authors.initials: J
authors.lastname: Bounds
authors.forename: Aysenur
authors.initials: A
authors.lastname: Bicer
authors.forename: James
authors.initials: J
authors.lastname: Strohaber
authors.forename: Alexandre A
authors.initials: AA
authors.lastname: Kolomenskii
authors.forename: Christoph
authors.initials: C
authors.lastname: Gohle
authors.forename: Mahmood
authors.initials: M
authors.lastname: Amani
authors.forename: Hans A
authors.initials: HA
authors.lastname: Schuessler
mesh_terms: D000114:Acetylene / Q000032:analysis*; D005740:Gases / Q000032:analysis*; D007834:Lasers; D057230:Limit of Detection; D019265:Spectroscopy, Near-Infrared / Q000379:methods*
chemical_list: D005740:Gases; D000114:Acetylene