1. Near infrared frequency comb vernier spectrometer for broadband trace gas detection.
- Author
-
Zhu F, Bounds J, Bicer A, Strohaber J, Kolomenskii AA, Gohle C, Amani M, and Schuessler HA
- Subjects
- Acetylene analysis, Gases analysis, Lasers, Limit of Detection, Spectroscopy, Near-Infrared methods
- 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.
- Published
- 2014
- Full Text
- View/download PDF