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Acta Physica Sinica

REDUCTION OF LIGHT SHIFT IN Rb87 FREQUENCY STANDARD USING PULSE SAMPLING OPTICAL DETECTION METHOD

DONG TAI-QIAN, 北京大学

Published Jan 1, 1981• 0 citations
Publisher

Abstract

Device of pulse optical pumping and pulse sampling optical detection is presentedto reduce the light shift in Rb87 atomic frequency standard. The 0-0 transitionlineshape and light shift is calculated. It is qualitatively, inagreement with the experimen-tal results. With this device, one may expect to improve the long term frequency sta-bility of the passive Rb87 atomic frequeney standard.

DOI
10.7498/aps.30.1

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Device of pulse optical pumping and pulse sampling optical detection is presentedto reduce the light shift in Rb87 atomic frequency standard. The 0-0 transitionlineshape and light shift is calculated. It is qualitatively, inagreement with the experimen-tal results. With this device, one may expect to improve the long term frequency sta-bility of the passive Rb87 atomic frequeney standard.
A pulsed optical pumping rubidium frequency standard has been constructed for the purpose of eliminating the light shift and investigation the long-term frequency stability in the absence of light shifts. The device used employs a very small physics package that occupies a total volume of only 260 cc. Initial measurements of the light shift for this device showed that the light shift was reduced by about an order of magnitude: to approximately -1.5 times 10 to the -10th power fractional frequency shift for a 30$ reduction in light intensity. Under these conditions, the square root of the Allan variance was determined to be of the order of parts in 10 to the 12th power for averaging times of 24 hrs and 48 hrs.
We report a simple method to suppress the light shift in optical pumping systems. This method uses only frequency modulation of a radio frequency or microwave source, which is used to excite an atomic resonance, to simultaneously lock the source frequency to the atomic resonance and lock the pumping light frequency to suppress the light shift. We experimentally validate the method in a vapor-cell atomic clock and verify the results through numerical simulation. This technique can be applied to many optical pumping systems that experience light shifts. It is especially useful for atomic frequency standards because it improves long-term performance, reduces the influence of the laser, and requires less equipment than previous methods.
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.
The /sup 87/Rb cell frequency standard, optically pumped by a laser diode, is of great interest in the development of high short-term stability oscillators. We report experiments performed on a rubidium cell prototype aiming at evaluate the transfer of the laser noise to the hyperfine clock transition via the light shift effect, which appears to be the main contribution to the observed short term frequency stability in this kind of standard. Pulsed optical pumping will also be examined in order to strongly reduce the light shift effect and to achieve the theoretical limit never approached up to now despite the strong detected microwave signals.
two-photon transition optical frequency standard (2hν-OFS). The approach used an auxiliary system to calibrate the light shift of the primary system in real time to mitigate the absolute light shift and suppress the sensitivity of the system to the light power. Results show that after using the DI method, the absolute light shift and light-power sensitivity of the system were reduced by a factor of 10. The proposed method will improve the accuracy of the Rb 778 nm 2hν-OFS and increase the mid- and long-term stability. The method can also be applied to other vapor-cell atomic frequency standards that experience light shifts.