NIST logo

Publication Citation: Spectroscopy with a coherent dual frequency comb interferometer at 3.4 µm

NIST Authors in Bold

Author(s): Esther Baumann; Fabrizio R. Giorgetta; Ian R. Coddington; William C. Swann; Nathan R. Newbury;
Title: Spectroscopy with a coherent dual frequency comb interferometer at 3.4 µm
Published: August 01, 2010
Abstract: A coherent dual fiber-comb spectrometer centered at 1.5 µm wavelengths is transferred to 3.4 µm by difference-frequency generation with a 1064 nm cw laser. It is shown that the residual linewidth between the comb teeth at 3.4 µm is resolution-limited to 200 mHz; such narrow linewidths can enable coherent dual-comb spectroscopy at high-precision and signal-to-noise ratio. We then discuss different interferometric configurations for coherent dual-comb spectroscopy. We find that a two branch interferometric setup is appropriate to measure both the magnitude and phase spectrum of purely Doppler broadened absorption lines. An initial measurement of methane lines in the nu3 band P-branch with a resolution of 114 MHz is demonstrated.
Proceedings: SPIE Optical Engineering + Applications:Interferometry XV: Techniques and Analysis
Volume: 7790
Pages: 8 pp.
Location: San Diego, CA
Dates: August 1-5, 2010
Keywords: Frequency combs, Mid-IR, Molecular spectroscopy
Research Areas: Optoelectronics, Molecular Spectroscopy
PDF version: PDF Document Click here to retrieve PDF version of paper (1MB)