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Demonstration of a HeNe/CH4-based optical molecular clock.

Authors
  • Foreman, Seth M
  • Marian, Adela
  • Ye, Jun
  • Petrukhin, Evgeny A
  • Gubin, Mikhail A
  • Mücke, Oliver D
  • Wong, Franco N C
  • Ippen, Erich P
  • Kärtner, Franz X
Type
Published Article
Journal
Optics Letters
Publisher
The Optical Society
Publication Date
Mar 01, 2005
Volume
30
Issue
5
Pages
570–572
Identifiers
PMID: 15789739
Source
Medline
License
Unknown

Abstract

We implement a simple optical clock based on the F2(2) [P(7), v3] optical transition in methane. A single femtosecond laser's frequency comb undergoes difference frequency generation to provide an IR comb at 3.39 microm with a null carrier-envelope offset. This IR comb provides a phase-coherent link between the 88-THz optical reference and the rf repetition rate. Comparison of the repetition rate signal with a second femtosecond comb stabilized to molecular iodine shows an instability of 1.2 x 10(-13) at 1 s, limited by microwave detection of the repetition rates. The single-sideband phase noise of the microwave signal, normalized to a carrier frequency of 1 GHz, is below -93 dBc/Hz at 1-Hz offset.

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