Laser-induced frequency shift in a spin-1 Bose–Einstein condensate of sodium. (January 2022)

• Record Type: Journal Article
• Authors: Zheng, Ningxuan; Liu, Wenliang; Sovkov, Vladimir; Tian, Li; Li, Yuqing; Fu, Yongming; Li, Peng; Wu, Jizhou; Ma, Jie; Xiao, Liantuan; Jia, Suotang
• Is Part Of: Journal of quantitative spectroscopy & radiative transfer. Volume 277(2022)
• Publication Date: 2022-01
• Subjects: Laser-induced frequency shift -- Photoassociation -- Spinor Bose–Einstein condensate; Spectrum analysis -- Periodicals; Radiation -- Periodicals; Analyse spectrale -- Périodiques; Rayonnement -- Périodiques; Radiation; Spectrum analysis; Periodicals; 543.0858
• DOI: 10.1016/j.jqsrt.2021.107985
• Languages: English
• ISSNs: 0022-4073

Abstract

Highlights: The laser-induced frequency shift (LIFS) and the full width at half maximum (FWHM) broadening of photoassociation (PA) in a spinor Bose–Einstein condensate (BEC) of sodium were measured in experiment for the first time. A linear variation of the frequency shift and the FWHM broadening for different spin components were demonstrated. A theoretical model, considering the interactions of the three channels was proposed to explain the linear dependence of the LIFS and the FWHM widening on the PA laser power. The experimental results are quantitatively consistent with the theoretical calculations. Abstract: Experimental measurement and analysis of the laser-induced frequency shifts (LIFSs) of photoassociation (PA) spectra in a spinor Bose–Einstein condensate (BEC) of sodium is reported. The trap loss spectra of the atoms in the BEC were recorded at different PA laser intensities. Linear variations of the frequency shift for different spin components were demonstrated. The analogous linear dependence on the intensity of the full width at half maximum (FWHM) of the spectra was also shown. The slopes of the linear relationships of the shift and broadening are both independent of spin component within the error range of the experiment. A theoretical model, considering the interactions of three channels (a scattering continuum state, a single bound level near the scattering state, and an optically excited light-dressed level), explains the linear dependence of the LIFSs and the FWHM broadening on the PA laser power. The experimental results are consistent with the theoretical calculations.