Baek Jaeuk, Park Sanghyun, Lee Min-Hwan, Noh Heung-Ryoul, Moon Geol
Department of Physics, Chonnam National University, Gwangju, 61186, Korea.
Center for Quantum Technologies, Chonnam National University, Gwangju, 61186, Korea.
Sci Rep. 2024 Mar 8;14(1):5705. doi: 10.1038/s41598-024-56229-5.
This paper describes the first observation of polarization-selective four-wave mixing signals in conventional coupling-probe spectroscopy, specifically, saturation absorption spectroscopy in Rb atoms. The four-wave mixing signal is induced by two counter-propagating laser beams in a degenerate multi-level atomic system, involving the , and 4 transitions of the Rb D2 line. Consequently, the four-wave mixing signals copropagating along the probe beam induce polarization rotation of a linearly polarized probe beam. To distinguish these four-wave mixing signals from the resulting probe beam, we detect the polarization components orthogonal to the polarization direction of the input probe beam, depending on the linear polarization angles between the probe and coupling beams. The experimental findings demonstrate excellent agreement with theoretical results.
本文描述了在传统耦合探针光谱学中首次观察到的偏振选择性四波混频信号，具体而言，是在铷原子中的饱和吸收光谱学中。四波混频信号由简并多能级原子系统中的两束反向传播的激光束诱导产生，涉及铷D2线的 、 和4跃迁。因此，沿探测光束共传播的四波混频信号会使线偏振探测光束发生偏振旋转。为了将这些四波混频信号与产生的探测光束区分开来，我们根据探测光束与耦合光束之间的线性偏振角度，检测与输入探测光束偏振方向正交的偏振分量。实验结果与理论结果显示出极佳的一致性。
