Strong-field effects in bichromatic laser-induced collisional energy transfer
Autori: Buffa Roberto, Cavalieri Stefano, Eramo Roberto, Fini Lorenzo, Matera Manlio
Affiliazione autori: Universita di Firenze, Firenze, Italy
Abstract: Laser-induced collisional energy transfer (LICET) is a process that involves two dissimilar atoms, one of which is excited, colliding in the presence of a monochromatic laser field. If the radiation field is properly tuned to an interatomic resonance, the initially excited system undergoes a transition to its ground state, while its partner gains both the excitation energy and that of a photon. The transfer cannot occur unless both collisional and radiative interaction are present. For a weak laser field, the LICET cross section, peaked at the interatomic resonance frequency. On the contrary, theoritical predictions of strong field models appear to to experimental confirmation. The different role played by two laser fields allows a perturbation treatment of the equation of motion in a dressed state basis. In the excitation spectrum, calculated for strong laser is reported showing a remarkable splitting of the resonance peak easily detectable.
Parole chiavi: Atoms; Calculations; Laser applications; Mathematical models; Radiation; Van der Waals forces, Interatomic resonance; Kleak field models; Kleak laser field; Laser induced collisional energy transfer; Monochromatic laser fields; Stark dynamic, Multiphoton processesDOI: 10.1109/EQEC.1994.698318