Similar to most of the other alkaline earth elements,barium atoms can be candidates for optical clocks,thus the magic wavelength for an optical lattice is important for the clock transition.We calculate the magic wave...Similar to most of the other alkaline earth elements,barium atoms can be candidates for optical clocks,thus the magic wavelength for an optical lattice is important for the clock transition.We calculate the magic wavelength of a possible clock transition between 6s21S0 and 6s5d3D2 states of barium atoms.Our theoretical result shows that there are three magic wavelengths 615.9 nm,641.2 nm and 678.8 nm for a linearly polarized optical lattice laser for barium.展开更多
Whether the transitions between 6s5d 3D and 5d6p 3F can be used for laser cooling of barium heavily depends upon the transition probabilities of 5d6p 3F-5d2 3F. Taking the transition 6s5d 3D3-5d6p 3F4 as a scale, the ...Whether the transitions between 6s5d 3D and 5d6p 3F can be used for laser cooling of barium heavily depends upon the transition probabilities of 5d6p 3F-5d2 3F. Taking the transition 6s5d 3D3-5d6p 3F4 as a scale, the leakage rate of 5d6p 3Fa-5d2 3F was used to evaluate the transition probabilities. 706 nm laser pulses with different durations were applied to a barium atomic beam for 6s5d 3D3-5d2 3F4 optical pumping, and the remaining percentages in 6s5d 3D3 were measured. After exponential fitting, the transition probability of 5d6p 3F4-5d2 3F3,4 was determined to be 2.1（4） ~ 104 s-1, which is in agreement with theoretical calculations using the scaled Thomas-Fermi-Dirac method.展开更多
基金by the National Natural Science Foundation of China under Grant Nos 11004227 and 11074281the National Basic Research Program of China under Grant No 2010CB832805,and the Chinese Academy of Sciences.
文摘Similar to most of the other alkaline earth elements,barium atoms can be candidates for optical clocks,thus the magic wavelength for an optical lattice is important for the clock transition.We calculate the magic wavelength of a possible clock transition between 6s21S0 and 6s5d3D2 states of barium atoms.Our theoretical result shows that there are three magic wavelengths 615.9 nm,641.2 nm and 678.8 nm for a linearly polarized optical lattice laser for barium.
文摘Whether the transitions between 6s5d 3D and 5d6p 3F can be used for laser cooling of barium heavily depends upon the transition probabilities of 5d6p 3F-5d2 3F. Taking the transition 6s5d 3D3-5d6p 3F4 as a scale, the leakage rate of 5d6p 3Fa-5d2 3F was used to evaluate the transition probabilities. 706 nm laser pulses with different durations were applied to a barium atomic beam for 6s5d 3D3-5d2 3F4 optical pumping, and the remaining percentages in 6s5d 3D3 were measured. After exponential fitting, the transition probability of 5d6p 3F4-5d2 3F3,4 was determined to be 2.1（4） ~ 104 s-1, which is in agreement with theoretical calculations using the scaled Thomas-Fermi-Dirac method.
