Research of optimal pump light intensity in rubidium atomic magnetometers

LI Jiajia; DING Zhichao; WANG Zhiguo; XIAO Guangzong; HU Shaomin

doi:10.7510/jgjs.issn.1001-3806.2016.05.015

In order to obtain the optimal pump light intensity of a rubidium atomic magnetometer and improve its sensitivity, the relationships among the polarization, signal to noise ratio, sensitivity of magnetometer and pump light intensity were analyzed. An experimental system was designed. Transverse relaxation time and longitudinal relaxation time of a 20mm diameter spherical vapor cell with different pump light intensity were measured by using free induction decay method. The corresponding polarization data was calculated and the fitting curves of polarization, signal to noise ratio, sensitivity influenced by pump light intensity were received. The results show that the optimal pump light intensity is optimum in the rubidium atomic magnetometer under the pump light intensity of about 10mW/cm2. It will be helpful for using the pump light effectively and optimizing sensitivity of the rubidium atomic magnetometers further.

Research of optimal pump light intensity in rubidium atomic magnetometers

Corresponding author: HU Shaomin, kdhushaomin@qq.com

1. College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, China;

2. Interdisciplinary Center for Quantum Information, National University of Defense Technology, Changsha 410073, China

Received Date: 2015-07-06

Accepted Date: 2015-08-18

Available Online: 2016-09-25

Abstract: In order to obtain the optimal pump light intensity of a rubidium atomic magnetometer and improve its sensitivity, the relationships among the polarization, signal to noise ratio, sensitivity of magnetometer and pump light intensity were analyzed. An experimental system was designed. Transverse relaxation time and longitudinal relaxation time of a 20mm diameter spherical vapor cell with different pump light intensity were measured by using free induction decay method. The corresponding polarization data was calculated and the fitting curves of polarization, signal to noise ratio, sensitivity influenced by pump light intensity were received. The results show that the optimal pump light intensity is optimum in the rubidium atomic magnetometer under the pump light intensity of about 10mW/cm2. It will be helpful for using the pump light effectively and optimizing sensitivity of the rubidium atomic magnetometers further.

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Reference (16)

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Research of optimal pump light intensity in rubidium atomic magnetometers

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