Title :
The progress of strontium optical clock at NIM
Author :
Wang Shao-Kai ; Wang Qiang ; Lin Bai-Ke ; Li Ye ; Lin Yi-Ge ; Wang Min-Ming ; Zhao Yang ; Cao Jian-Ping ; Zang Er-Jun ; Li Tian-Chu ; Fang Zhan-Jun
Author_Institution :
Nat. Inst. of Metrol., Beijing, China
Abstract :
We report the experimental realization of 88Sr magneto-optical trap (MOT) operating at the wavelength of 461 nm and 689nm. The blue MOT is loaded via a 32 cm long spin-flip type Zeeman slower which enhances the MOT population by a factor of 44. We have trapped 1.6×108 88Sr atoms with the use of 679nm and 707nm repumping laser. The 88Sr cloud has a temperature of about 2.3 mK, measured by recording the time evolution of the absorption signal. The 689nm laser used in our experiment has a line width of about 200Hz. To optimize the transfer efficiency, the laser spectrum is broadened by frequency modulation technique to about 2 MHz. The transfer efficiency from blue MOT to red MOT is about 20%.
Keywords :
Zeeman effect; atomic clocks; optical pumping; radiation pressure; spectral line broadening; strontium; temperature measurement; MOT; NIM; absorption signal; atom trapping; frequency modulation technique; laser spectrum; magnetooptical trap; repumping laser; size 32 cm; spin-flip type Zeeman slower; strontium optical clock; temperature measurement; time evolution; wavelength 461 nm; wavelength 679 nm; wavelength 689 nm; wavelength 707 nm;
Conference_Titel :
EFTF-2010 24th European Frequency and Time Forum
Conference_Location :
Noordwijk
Print_ISBN :
978-1-4673-5970-2
DOI :
10.1109/EFTF.2010.6533714
