title: Energy efficient method for two-photon population transfer with near-resonant chirped pulses.
abstract: We investigate a method for complete population inversion in three level systems through pi-pulse bichromatic two-photon coherent excitation and study the dependence on the chirp of the laser pulses. We observe that the population inversion does not monotonously decrease with increasing the time-bandwidth product, and that the excitation depends on the sign of the chirp of the individual pulses. Our results evidence a strategy for coherent population transfer which is energetically superior to adiabatic methods and opens the door for real-world applications, since it alleviates the need for challenging generation of transform-limited pulses at arbitrary wavelengths.
authors.affiliation: DTDI - Universitat de Vic, Carrer de la Laura 13, 08500 Vic, Barcelona, Spain.
authors.forename: Carles
authors.initials: C
authors.lastname: Serrat
authors.forename: Jens
authors.initials: J
authors.lastname: Biegert