Ja n 20 01 Recoil - Induced - Resonances in Nonlinear , Ground - State , Pump - Probe Spectroscopy
نویسنده
چکیده
A theory of pump-probe spectroscopy is developed in which optical fields drive two-photon Raman transitions between ground states of an ensemble of three-level atoms. Effects related to the recoil the atoms undergo as a result of their interactions with the fields are fully accounted for in this theory. The linear absorption coefficient of a weak probe field in the presence of two pump fields of arbitrary strength is calculated. For subrecoil cooled atoms, the spectrum consists of eight absorption lines and eight emission lines. In the limit that χ 1 ≪ χ 2 , where χ 1 and χ 2 are the Rabi frequencies of the two pump fields, one recovers the absorption spectrum for a probe field interacting with an effective two-level atom in the presence of a single pump field. However when χ 1 χ 2 , new interference effects arise that allow one to selectively turn on and off some of these recoil induced resonances.
منابع مشابه
0 Recoil - Induced - Resonances in Nonlinear , Ground - State , Pump - Probe Spectroscopy
A theory of pump-probe spectroscopy is developed in which optical fields drive two-photon Raman transitions between ground states of an ensemble of three-level Λ atoms. Effects related to the recoil the atoms undergo as a result of their interactions with the fields are fully accounted for in this theory. The linear absorption coefficient of a weak probe field in the presence of two pump fields...
متن کامل2 00 1 Recoil - Induced - Resonances in Nonlinear , Ground - State , Pump - Probe Spectroscopy
A theory of pump-probe spectroscopy is developed in which optical fields drive two-photon Raman transitions between ground states of an ensemble of three-level atoms. Effects related to the recoil the atoms undergo as a result of their interactions with the fields are fully accounted for in this theory. The linear absorption coefficient of a weak probe field in the presence of two pump fields o...
متن کاملRecoil-induced resonances in pump-probe spectroscopy including effects of level degeneracy.
متن کامل
Femtosecond Wavepacket Spectroscopy: Influence of Temperature, Wavelength, and Pulse Duration
We discuss pump-probe signals from the wavepackets which are simultaneously generated on both the ground and excited electronic states by weak optical pulses shorter in duration than a vibrational period. A classical model of localized ground state bleaching and excited state population of the internuclear geometries where the photon energy matches the electronic energy gap predicts the pump an...
متن کاملElectromagnetically induced gain in molecular systems
We report electromagnetically induced gain in a highly degenerate two-level rotational vibrational molecular system. Using two photon Raman-type interaction with right and left circularly polarized pump and probe waves, the Zeeman coherence is established within the manifold of degenerate sublevels belonging to a rotational vibrational eigenstate. We analytically and numerically calculate the t...
متن کامل