[20a-P03-1~4] 1.5 Instrumentation, measurement and Metrology

[20a-P03-1] The Removing Method for Light Shifts in Ramsey-CPT Spectra with Different Free Evolution Time

〇Hiroyoki Gamou¹, Masahiro Fukuoka¹, Shigeyoshi Goka¹ (1.Tokyo Metro. Univ.)

Keywords:Ramsey-CPT spectroscopy, chip scale atomic clock, pulsed excitation

We propose a method that can estimate the Ramsey-CPT resonance frequency without light shifts by using different free evolution time. Light shifts are the major factor of deteriorating the long-term frequency stability in a CPT atomic clock and our proposal indicate the possibility to make the long-term frequency stability improved. In the method a target resonance frequency without light shifts can be assumed from an asymptotic value of fitted curves which show light shifts are in inverse proportion to free evolution times. We also can know light shifts from the fitted curves at any time. This report shows the effectiveness of the method.