Author:
Hao 郝 Jian-Hai 建海,Jia 贾 Feng-Dong 凤东,Cui 崔 Yue 越,Wang 王 Yu-Han 昱寒,Zhou 周 Fei 飞,Liu 刘 Xiu-Bin 修彬,Zhang 张 Jian 剑,Xie 谢 Feng 锋,Bai 白 Jin-Hai 金海,You 尤 Jian-Qi 建琦,Wang 王 Yu 宇,Zhong 钟 Zhi-Ping 志萍
Abstract
We have theoretically and experimentally studied the dispersive signal of the Rydberg atomic electromagnetically-induced transparency (EIT) Autler–Townes (AT) splitting spectra obtained using amplitude modulation of the microwave (MW) electric field. In addition to the two zero-crossing points interval Δf
zeros, the dispersion signal has two positive maxima with an interval defined as the shoulder interval Δf
sho, which is theoretically expected to be used to measure a much weaker MW electric field. The relationship of the MW field strength E
MW and Δf
sho is experimentally studied at the MW frequencies of 31.6 GHz and 9.2 GHz respectively. The results show that Δf
sho can be used to characterize the much weaker E
MW than that of Δf
zeros and the traditional EIT–AT splitting interval Δf
m; the minimum E
MW measured by Δf
sho is about 30 times smaller than that by Δf
m. As an example, the minimum E
MW at 9.2 GHz that can be characterized by Δf
sho is 0.056 mV/cm, which is the minimum value characterized by the frequency interval using a vapor cell without adding any auxiliary fields. The proposed method can improve the weak limit and sensitivity of E
MW measured by the spectral frequency interval, which is important in the direct measurement of weak E
MW.
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