Absolute frequency measurements of methane absorption lines with a stabilized near-infrared optical frequency comb

Kristan L. Corwin1,2, Tasshi Dennis1, Isabell Thomann1,3, Richard Fox1, William Swann1, E. Anne Curtis1,
Chris W. Oates1, Guido Wilpers1, Albrecht Bartels1, Sarah L. Gilbert1, Leo Hollberg1, Scott A. Diddams1,
Nathan R. Newbury1, Jeffrey W. Nicholson4, Man F. Yan4

2) Kansas State Univ., USA
3) Univ. of Colorado, USA
4) OFS Labs., USA.

A Cr:forsterite laser-based frequency comb is stabilized simultaneously to two NIST frequency references. Methane lines from 1315 nm - 1330 nm are measured with an uncertainty of 2.3 MHz. The pressure shifts are also evaluated.

This work was supported by the Chemical Sciences, Geosciences and Biosciences Division,
Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy.

Submitted to CLEO/IQEC, May 2004 in San Francisco, CA.

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