State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics Engineering and Computer Science, and Center for Quantum Information Technology, Peking University, Beijing 100871, China.
Science and Technology on Metrology and Calibration Laboratory, Beijing Institute of Radio Metrology and Measurement, Beijing 100876, China.
Sci Rep. 2016 Jul 15;6:29882. doi: 10.1038/srep29882.
The Faraday anomalous dispersion optical filter (FADOF), which has acquired wide applications, is mainly limited to some gaseous elements and low melting-point metals before, for the restriction of the attainable atomic density. In conventional FADOF systems a high atomic density is usually achieved by thermal equilibrium at the saturated vapor pressure, hence for elements with high melting-points a high temperature is required. To avoid this restriction, we propose a scheme of FADOF based on the hollow cathode lamp (HCL), instead of atomic vapor cells. Experimental results in strontium atoms verified this scheme, where a transmission peak corresponding to the (88)Sr (5s(2))(1)S0 - (5s5p)(1)P1 transition (461 nm) is obtained, with a maximum transmittance of 62.5% and a bandwith of 1.19 GHz. The dependence of transmission on magnetic field and HCL discharge current is also studied. Since the state-of-art commercial HCLs cover about 70 elements, this scheme can greatly expand the applications of FADOFs, and the abundant atomic transitions they provide bring the HCL based FADOFs potential applications for frequency stabilization.
远失超反常色散滤光器（FADOF）在获得广泛应用之前，主要局限于一些气态元素和低熔点金属，因为其原子密度的可实现性受到限制。在传统的 FADOF 系统中，通常通过在饱和蒸气压下的热平衡来实现高原子密度，因此对于熔点较高的元素需要较高的温度。为了避免这种限制，我们提出了一种基于空心阴极灯（HCL）的 FADOF 方案，而不是原子蒸气池。在锶原子的实验结果中验证了该方案，其中获得了对应于（88）Sr（5s(2))(1)S0 - （5s5p）(1)P1 跃迁（461nm）的透射峰，最大透过率为 62.5%，带宽为 1.19GHz。还研究了透射率对磁场和 HCL 放电电流的依赖性。由于最先进的商用 HCL 涵盖约 70 种元素，因此该方案可以大大扩展 FADOF 的应用范围，并且它们提供的丰富原子跃迁为基于 HCL 的 FADOF 带来了用于频率稳定的潜在应用。
