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