Abstract
We employed a different approach to develop multi-frequency saturated-absorption spectroscopy (SAS) involving both cesium hyperfine ground state levels using a multimode external cavity diode laser (ECDL), which could operate with neither another independent laser nor a modulator. The multi-frequency SAS is formed by atomic velocity groups on resonance with both of the laser modes from an ECDL in multimode operation, which are counterpropagated through the vapor cell as a quasicoherent pair of laser beams. A sign reversal of the sub-Doppler resonance under special pump–probe polarization with and without applied magnetic fields is observed. Simultaneously, the optical microwave generation of the multimode ECDL is also investigated experimentally. The free-running linewidth of the beat note spectra between two modes is about 475 Hz, which indicates a high coherence between them. This oscillator- and modulator-free approach provides a complementary scheme for existing optical microwave generation and has potential for improvements.
© 2023 Optica Publishing Group
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)
Liantuan Xiao, Changyong Li, Qian Li, Suotang Jia, and Guosheng Zhou
Appl. Opt. 39(6) 1049-1052 (2000)
Hui Chen, Hebin Li, Yuri V. Rostovtsev, Mikhail A. Gubin, Vladimir A. Sautenkov, and Marlan O. Scully
J. Opt. Soc. Am. B 23(4) 723-726 (2006)