Abstract
The laser cooling of ytterbium (Yb) atoms needs a 399-nm laser which operates on the strong 1S0
-1P1 transition and can be locked at the desired frequencies for different Yb isotopes. We demonstrate a
frequency locking method using the fluorescence spectrum of an Yb atomic beam as a frequency reference. For
unresolved fluorescence peaks, we make the spectrum of the even isotopes vanish by using the strong
angular-dependence of the fluorescence radiations; the remained closely-spaced peaks are thus clearly resolved
and able to serve as accurate frequency references. A computer-controlled servo system is used to lock the
laser frequency to a single fluorescence peak of interest, and a frequency stability of 304 kHz is achieved.
This frequency-locked laser enables us to realize stable blue magneto-optic-traps (MOT) for all abundant Yb
isotopes.
© 2014 Chinese Optics Letters
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