Spectroscopy with a coherent dual frequency comb interferometer at 3.4 &#956;m

Esther Baumann; Fabrizio R. Giorgetta; Ian Coddington; William C. Swann; Nathan R. Newbury

doi:10.1117/12.859730

2 August 2010 Spectroscopy with a coherent dual frequency comb interferometer at 3.4 μm

Esther Baumann, Fabrizio R. Giorgetta, Ian Coddington, William C. Swann, Nathan R. Newbury

Proceedings Volume 7790, Interferometry XV: Techniques and Analysis; 77900X (2010) https://doi.org/10.1117/12.859730
Event: SPIE Optical Engineering + Applications, 2010, San Diego, California, United States

Abstract

A coherent dual fiber-comb spectrometer centered at 1.5 μm wavelengths is transferred to 3.4 μm by differencefrequency 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 υ₃ band P-branch with a resolution of 114 MHz is demonstrated.

Citation Download Citation

Esther Baumann, Fabrizio R. Giorgetta, Ian Coddington, William C. Swann, and Nathan R. Newbury "Spectroscopy with a coherent dual frequency comb interferometer at 3.4 μm", Proc. SPIE 7790, Interferometry XV: Techniques and Analysis, 77900X (2 August 2010); https://doi.org/10.1117/12.859730

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available