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Improvement of the spin polarization lifetime in the 85Rb vapor cell by octadecyltrichlorosilane coating

Improvement of the spin polarization lifetime in the 85Rb vapor cell by octadecyltrichlorosilane coating
S. M. H. Khalkhali1, M. Ranjbaran2, D. Mofidi2, S. M. Hamidi2, M. M. Tehranchi2, 3
۱: Physics Department, Kharazmi University, Tehran, Iran.
۲: Laser and Plasma Research Institute, Shahid Behehshti University, Tehran, Iran.
۳: Physics Depatrment, Shahid Behehshti University, Tehran, Iran.
Chinese Journal of Physics

 

 

Abstract
Effective surface coatings allow long spin polarization in alkali metal cells suppressing magnetic field gradient effect and providing improvement in atomic magnetometer sensitivity. In this work, the effect of octadecyltrichlorosilane (OTS) surface coating on the longitudinal and transverse spin polarization lifetime of optically pumped 85Rb vapor cell has been studied. Our results showed that the spin polarization lifetime significantly increased in OTS lined cell compared to the unlined cell. The relaxation rate due to alkali metal atoms wall collisions and magnetic field gradient has been decreased by using OTS surface coating. Longer spin polarization life time in the lined cell cause a narrower magnetic resonance line width and subsequently a more sensitive atomic magnetometer.