Absolute frequency measurement of sub-Doppler molecular lines using a 3.4-μm difference-frequency-generation spectrometer and a fiber-based frequency comb

  • Takahata K
  • Kobayashi T
  • Sasada H
 et al. 
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We measure the absolute frequency of 12 sub-Doppler lines of the P6
and P7 transitions in the 3 band

of 12CH4 using difference-frequency-generation DFG of 1.064-m Nd:YAG
and 1.55-m DFB lasers and a

fiber-based frequency comb referenced to International Atomic Time.
The relative uncertainties are typically

9.410?11, and the determined value for the P7 F2 2 line agrees
with the International Committee for

Weights and Measures recommendation with a discrepancy of 1.28.4
kHz. The combination of the DFG

spectrometer and the frequency comb enables determining energy levels
as accurately as microwave


See references 13 and 14 for other papers that rerference fiber combs.

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  • Keisuke Takahata

  • Takumi Kobayashi

  • Hiroyuki Sasada

  • Yoshiaki Nakajima

  • Hajime Inaba

  • Feng Lei Hong

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