Development of laser sources with a sub-Hertz linewidth using

点击翻译按钮获取中文摘要

We have proven that the mechanism of laser linewidth reduction using the traditionalPound-Drever-Hall method is mathematically equivalent to that using the signal of polarization spectroscopy provided that the optical density of the atomic sample is well below unity. A proof-of-principle experiment was conducted using a Rb vapor cell. We performed polarization spectroscopy of Li6 and proved that the saturation of the transition caused by the pump beam enables polarization spectroscopy without spin polarization. As a source of Sr for spectroscopy, we examine the performance of the Sr hollow cathode lampusing the 461nm（1S0-1P1）transition and proved that polarization spectroscopy relying onpump-beam-induced saturation was possible even in a hollow cathode discharge.