Multicolored coherent population trapping in a system using phase modulated fields.
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 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.
Wanare
Harshawardhan
H
Department of Physics and Center for Laser Technology, Indian Institute of Technology, Kanpur 208016, India. hwwanare@iitk.ac.in