Abstract
We present a technique, called the polarization enhanced tunable Doppler-free dichroic lock (PET-DFDL) technique, for frequency stabilization of a laser system. This technique is based on the magnetically induced circular dichroism for a pair of circularly polarized probe beams overlapped by oppositely circularly polarized counterpropagating pump beams. The amplitude and slope of the signal generated in the PET-DFDL technique at cooling transition ${\rm{F}} = 2 \to {\rm{F}}^\prime = 3$ in $^{87}{\rm Rb}$ atom are nearly 4 times higher than those of signal generated from conventional Doppler-free dichroic lock (DFDL). The proposed PET-DFDL technique can also provide tunable lock-position. The frequency stability of a laser system locked with the PET-DFDL technique has been improved by factor of 2 as compared to frequency stability obtained by the DFDL technique. The dependence of PET-DFDL signal on pump beam power and magnetic field for the cooling transition of $^{87}{\rm Rb}$ atom is also investigated.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Minhua Zhao, Xunda Jiang, Ruihuan Fang, Yuxiang Qiu, Zhu Ma, Chengyin Han, Bo Lu, and Chaohong Lee
Appl. Opt. 60(17) 5203-5207 (2021)
Y. B. Kale, V. B. Tiwari, S. Singh, S. R. Mishra, and H. S. Rawat
J. Opt. Soc. Am. B 31(11) 2531-2539 (2014)
Swarupananda Pradhan and Bhagawantrao N. Jagatap
J. Opt. Soc. Am. B 28(3) 398-405 (2011)