Absolute Optical Frequency Measurement of the Cesium D1 Line with a Mode-Locked Laser
نویسندگان
چکیده
We have measured the absolute optical frequency of the cesium D1 line at 335 THz (895 nm). This frequency provides an important link for a new determination of the fine structure constant a. The D1 line has been compared with the fourth harmonic of a methane stabilized He-Ne laser at 88.4 THz (3.39 mm). To measure the frequency mismatch of 18.39 THz between 4 3 88.4 THz 354 THz and the D1 line a frequency comb spanning around 244 000 modes of a Kerr-lens mode-locked laser was used. We find 1 167 688 (81) kHz for the hyperfine splitting of the 6P1y2 state and 335 116 048 807 (41) kHz for the hyperfine centroid from which we derive a21 137.035 992 4s41d. [S0031-9007(99)09057-2]
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