A. Krishna et al 2005 Europhys. Lett. 72 221 doi:10.1209/epl/i2005-10228-6
A. Krishna, K. Pandey, A. Wasan and V. Natarajan
Show affiliationsWe use the phenomenon of electromagnetically induced transparency in a three-level atomic system for hyperfine spectroscopy of upper states that are not directly coupled to the ground state. The three levels form a ladder system: the probe laser couples the ground state to the lower excited state, while the control laser couples the two upper states. As the frequency of the control laser is scanned, the probe absorption shows transparency peaks whenever the control laser is resonant with a hyperfine level of the upper state. As an illustration of the technique, we measure hyperfine structure in the 7S1/2 states of 85Rb and 87Rb, and obtain an improvement of more than an order of magnitude over previous values.
Issue 2 (October 2005)
Received 7 June 2005, accepted for publication 18 August 2005, in final form 18 August 2005
Published 14 September 2005
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