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|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|
|Location:||San Diego, CA|
|Dates:||August 1-5, 2010|
|Keywords:||Frequency combs, Mid-IR, Molecular spectroscopy|
|Research Areas:||Optoelectronics, Molecular Spectroscopy|
|PDF version:||Click here to retrieve PDF version of paper (1MB)|