Abstract
Laser-cooled alkaline earth atoms are prime candidates for constructing optical frequency standards because they can be trapped/cooled on the strong 1S0 1P1 transition and interrogated using the narrow 1S0 3P1 intercombination line as the clock transition, A consequence of their J = 0 ground-state structure is that they do not achieve the sub-Doppler temperatures characteristic of the alkali traps, and the residual Doppler width of the trapped sample remains much greater than the intercombination linewidth. In strontium, however, the possibility exists to cool the atoms to near the recoil limit using the 7-kHz intercombination line at 689 nm.
© 1998 Optical Society of America
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