Abstract
The use of the forbidden optical transition of a single laser-cooled ion stored in a Paul-Straubel trap has been proposed as the basis for a new atomic frequency standard of high accuracy.1 We investigated the In+ ion with its narrow 5 s2 1S0 → 5 s 5p 3P0 transition at 236.5nm2 (Fig. 1). This clock transition is especially technically convenient, since it coincides with the fourth harmonic of the 946-nm transition 4F3/2 → 4I9/2 of the ND:YAG laser. So this intrinsically frequency stable solid-state laser can be used as the oscillator to drive the clock transition.3
© 1994 IEEE
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