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Journal of the Physical Society of Japan

Analyzing Electromagnetically Induced Transparency and Autler–Townes Splitting in a Doppler-broadened Three-level System Using Spectral Decomposition Followed by Integration

孟腾飞 Meng Tengfei, Zhonghua Ji, Jianfeng Tian, Yanting Zhao

Published Dec 27, 2024• 0 citations
Publisher
DOI
10.7566/jpsj.94.024401

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We study the relationship between electromagnetically-induced transparency(EIT) and Autler–Townes(AT) splitting in a cascade three-level Doppler-broadened system. By comparing the absorption spectrum with the fluorescence excitation spectrum, it is found that for a Doppler-broadened system, EIT resonance cannot be explained as the result of quantum interference, unlike the case of a homogeneously broadened system. Instead, the macroscopic polarization interference plays an important role in determining the spectra of EIT and AT splitting, which can be explained within the same framework when being detected by the absorption spectra.
We describe in this Letter how inhomogeneous line broadening affects the Autler-Townes (AT) splitting in a three level open molecular cascade system. For moderate Rabi frequencies in the range of 300 to 500 MHz the fluorescence line shape from the uppermost level |3> in this system depends strongly on the frequency ratio of the two laser fields. However, the fluorescence spectrum of the intermediate level |2> appears as expected. We provide a description of the conditions for optimally resolved AT splitting in terms of the probe laser/coupling field frequency ratio and laser propagation geometry based on our theoretical analysis of the Doppler integral. This is important for applications such as molecular angular momentum alignment as well as for the measurement of the transition dipole moment matrix element.