Thu May 18 09:34:48 BST 2006
- Phys. Rev. Lett. 96, 183601 (2006)
- Title: Multicolored Coherent Population Trapping in a \Lambda System Using Phase Modulated Fields
- Author: Harshawardhan Wanare
- Abstract: We demonstrate the simultaneous occurrence of coherent population trapping at a series of frequencies separated by modulation frequency of phase-modulated fields. The two arms of the \Lambda system are coupled to two phase-modulated fields and the response of the atomic system to such fields is calculated nonperturbatively. A judicious choice of modulation characteristics allows one to selectively switch on or off the occurrence of coherent population trapping at specific frequencies. A new technique is developed to compute two-dimensional tridiagonal matrix equations. This generalized technique provides the vital methodology needed to calculate the response of such systems in the strong modulation regime and for arbitrary field strengths.
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