This paper reports experimental investigations of the spectral response of synchronous coherent population trapping (CPT) for magnetometry applications. Synchronous CPT is demonstrated using resonant two-photon excitation with a modulated bichromatic laser field in the ${}^{87}\mathrm{Rb} D_1$ manifold. Spectra containing multiple magnetic resonances are produced due to two-photon excitations created by various frequency components of the modulated beam. Theoretical modeling based on the atomic density-matrix equations is used to simulate the spectral response of synchronous CPT. Our results show potential advantages of synchronous CPT over synchronous optical pumping for magnetic field measurement. Magnetic resonance signals produced by synchronous CPT can be used in eliminating the dead-zone problem and also in determining the magnetic field direction.

中文翻译：

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铷蒸气中的同步相干布居俘获及其磁谱响应

本文报告了用于磁力测量应用的同步相干布居俘获 (CPT) 光谱响应的实验研究。使用具有调制双色激光场的共振双光子激发演示了同步 CPT${}^{87}铷 D_1$多方面的。由于调制光束的各种频率分量产生的双光子激发，产生了包含多个磁共振的光谱。使用基于原子密度矩阵方程的理论建模来模拟同步 CPT 的光谱响应。我们的结果显示了同步 CPT 在磁场测量中相对于同步光泵浦的潜在优势。同步 CPT 产生的磁共振信号可用于消除死区问题，也可用于确定磁场方向。