Urabe S, Watanabe M, Imajo H, Hayasaka K
Opt Lett. 1992 Aug 15;17(16):1140-2. doi: 10.1364/ol.17.001140.
We describe the laser cooling of Ca(+) ions in a rf ion trap and the measurement of its 3(2)D(5/2) state lifetime. The ions are cooled to below 1 K by radiation from a frequency-doubled Ti:sapphire laser and a laser diode. The radiative lifetime is measured by observing the change in fluorescence when the ions, which are optically pumped to the metastable state, return to the cooling cycle. The lifetime of the 3(2)D(5/2) state is measured to be 0.77 +/- 0.07 s.
我们描述了在射频离子阱中对Ca(+)离子的激光冷却及其3(2)D(5/2)态寿命的测量。通过倍频钛宝石激光器和激光二极管的辐射，离子被冷却到1 K以下。通过观察被光泵浦到亚稳态的离子回到冷却循环时荧光的变化来测量辐射寿命。测得3(2)D(5/2)态的寿命为0.77±0.07秒。
