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Conference on Precision Electromagnetic Measurements

Rabi Resonance Measurements Based on CS Vapor Cell for Microwave Magnetic Field Detection in Free Space

Xiaochi Liu, Zhiyuan Jiang, Jifeng Qu, Dong Hou, Fuyu Sun

Published Jul 1, 2018• 3 citations
Publisher

Abstract

In this paper we characterized the lineshapes of Rabi resonances for microwave (MW) magnetic field with cesium vapor cell in free space. The relation between resonance lineshapes and phase modulation frequency under different experimental parameters are investigated. Based on the obtained lineshapes, the evaluation of Rabi frequency has been done in free space. Optimal laser intensity and cell temperature are obtained in our experiment, preliminary analysis of the experimental results is reported.

DOI
10.1109/cpem.2018.8501052

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In this work, we demonstrate a microwave magnetic field imaging technique based on Rabi resonance with a cesium atom vapor cell. Rabi resonance signals are generated when atoms interact with a phase-modulated microwave (MW) field and are detected by a photodiode and camera. A low noise, high quantum efficiency camera is used to capture a series of frames for different phase modulation frequencies. Rabi frequencies of each spatial point in the field can be measured by scanning the frames. Thus, the strength of the MW magnetic field distribution is obtained by combing the Rabi frequencies, measured with camera pixels in the range of the probe laser beam. The simple architecture of this imaging setup holds great potential for the construction of compact/miniature MW field sensors for material testing, field imaging of MW components, and biomedical imaging.
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We present a technique for measuring microwave (MW) field based on Rabi resonances induced by the interaction of atoms with a phase-modulated MW field. A theoretical model of field measurement is used to calculate Rabi frequency. Single-peak feature of the measurement model makes the technique a valuable tool for simple and fast field measurement. As an example, we use the technique to determine the MW field strength inside a Cs vapor cell in the X-band rectangular cavity for applied power in the range of -21 dBm to 20 dBm. The results show that this proposed technique is capable for detecting the field over a broad dynamical range.
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