Author Affiliations
Abstract
1 Key Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 University of Chinese Academy of Science, Beijing 100049, China
3 Center for Cold Atom Physics, Chinese Academy of Sciences, Shanghai 201800, China
We experimentally observe polarization spectroscopy (PS) of the S01-P31 transition of mercury atom gases at 253.7 nm. The PS signal can be observed in all six richly abundant isotopes and the PS signal of six transitions for laser cooling are all clear and of a dispersive line shape. The optimized pump power and probe power are found for the PS of Hg202. We find the linearly polarized component in the pump beam will distort the original PS signal due to the use of linear PS. Consequently, the purity of the pump beam is crucial to laser frequency stabilization by PS.
300.6210 Spectroscopy, atomic 300.6310 Spectroscopy, heterodyne Chinese Optics Letters
2015, 13(7): 073001
Author Affiliations
Abstract
1 Department of Physics, School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China
2 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
We present a Herriott-type multipass laser absorption spectrometer enhanced by optical heterodyne detection. The proposal is demonstrated by measuring the spectra of water vapor molecule in the region from 12247.6873 to 12249.6954 cm-1. Compared with direct absorption spectroscopy, the signal-to-noise ratio is improved nearly one magnitude of factor by combining with the optical heterodyne spectroscopy and extra weak absorption lines are observed. The minimum detectable absorption is estimated at 4.36×10-8 cm-1and the measured line shape dominated by Doppler broadening can be precisely recovered by direct transformation of experimental optical heterodyne spectral profile.
300.1030 Absorption 300.6310 Spectroscopy, heterodyne Chinese Optics Letters
2015, 13(1): 013001
