Measurement of the absolute frequency of the methane E-line at 88 THz
Abstract
We report an absolute frequency measurement of the E-line of CH 4 at 88 THz interrogated by a Zeeman-tuned 3.39 μm He-Ne laser using a phase-coherent frequency measurement chain linking to a Cs-clock. We find a value of νE=88 373 149 028 553±200 Hz increasing the accuracy of the optical frequency of this reference substantially over previous measurements.
- Publication:
-
Optics Communications
- Pub Date:
- June 1998
- DOI:
- 10.1016/S0030-4018(98)00107-2
- Bibcode:
- 1998OptCo.151..229E