We study Λ-type Electromagnetically Induced Transparency (EIT) on the Rb D2 transition in a buffer-gas-free thermal vapor cell without anti-relaxation coating. Experimental data show well-resolved features due to velocity-selective optical pumping and one EIT resonance. The Zeeman splitting of the EIT line in magnetic fields up to 12 Gauss is investigated. One Zeeman component is free of the first-order shift and its second-order shift agrees well with theory. The full width at half maximum (FWHM) of this magnetic-field-insensitive EIT resonance is reduced due to Doppler narrowing, scales linearly in Rabi frequency over the range studied, and reaches about 100 kHz at the lowest powers. These observations agree with an analytic model for a Doppler-broadened medium developed in (Javan et al 2002 Phys. Rev. A 66 013805; Lee et al 2003 Appl. Phys. B, Lasers Opt. (Germany) B 76 , 33–9; Taichenachev et al 2000 JETP Lett. 72 ...

中文翻译：

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蒸气室中85 Rb D2线的Λ型电磁感应透明性中的多普勒变窄，塞曼和激光束形状效应

我们研究了无缓冲气体的无热松弛涂层的Rb D2跃迁上的Λ型电磁感应透明度（EIT）。实验数据显示出由于速度选择光学泵浦和一次EIT共振而获得的良好分辨的特征。研究了在高达12高斯的磁场中EIT线的Zeeman分裂。一个塞曼分量没有一阶位移，其二阶位移与理论吻合得很好。由于多普勒变窄，这种对磁场不敏感的EIT共振的半峰全宽（FWHM）减小了，在研究的范围内拉比频率呈线性缩放，并且在最低功率下达到约100 kHz。这些观察结果与（Javan等人2002 Phys。Rev. A 66 013805; Lee等人2003 Appl。Phys。B，激光选项。（德国）B 76，33–9; Taichenachev等2000 JETP Lett。72 ...