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Journal of Optoelectronics·laser

Light Frequency Shift in a Cesium Beam Frequency Standard with Sharp Angle Incident Laser Light Pumping

Yiqiu Wang

Published Jan 1, 2001• 0 citations
OpenAlex

Abstract

In the experimental system of the small cesium beam frequency standard with sharp angle incident laser light pumping and sharp angle incident laser light probing,the light frequency shift (mainly caused by AC Stark effect) caused by fluorescence from pumping region was calculated theoretically.The results show,the light frequency shift can be effectively reduced in the sharp angle laser light pumping scheme.In additon,a new method to measure the light frequency shift by changing the diffusing angle of the pumping laser light beam was presented in this paper.

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Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)•Jul 8, 2004•5 citations
In the experimental system of the small cesium beam frequency standard with sharp angle incident laser light pumping and sharp angle incident laser light probing,the light frequency shift (mainly caused by AC Stark effect) caused by fluorescence from pumping region was calculated theoretically.The results show,the light frequency shift can be effectively reduced in the sharp angle laser light pumping scheme.In additon,a new method to measure the light frequency shift by changing the diffusing angle of the pumping laser light beam was presented in this paper.
One of the important subjects in coherent-population- trapping-based (CPT-based) vapor cell frequency standards is the light shift (ac Stark shift). We calculate the light shift using a numerical method and perturbation approximation. Experimentally, we measure light shift using a pair of phase-locked diode lasers as well as a frequency-modulated diode laser. There is good agreement between theory and experiment. A method of controlling light shift in CPT-based frequency standards is proposed and implemented in Agilent Laboratories. The short-term stability of our CPT-based rubidium vapor cell frequency standard is measured as 1.3 x 10(-12) tau (-1/2), which is limited by the phase noise of the reference local oscillator used.
Summary form only given. We investigated the effect of temporal and spatial characteristics not only on the ionization spectrum but on the excited-state population. From the calculational results in which Gaussian temporal and spatial variation was assumed, it was found that the nonuniformity of a laser made the shift of ionization peak frequency different from that of excitation peak frequency. This result indicates that measurement of an ac Stark shift cross section by detecting the fluorescence emitted from an excited state might give the different results comparing with the ionization spectrum measurement case.
We investigate a novel method to suppress the light-shift effect in laser-pumped passive rubidium frequency standards. The reduction of the light-shift due to additional frequency components in the pumping light is studied theoretically and compared to experimental results obtained with a frequency-modulated DBR laser diode as a pumping light source. In this way, a reduction of the light shift by a factor of 55 was successfully demonstrated. Complete cancellation of the light shift can be reached with a suitably adjusted modulation index and frequency.