Symmetry-Based Selective Femtosecond Coherent Control of Transient Two-Photon Absorption

Details Symmetry-Based Selective Femtosecond Coherent Control of Transient Two-Photon Absorption Symmetry-Based Selective Femtosecond Coherent Control of Transient Two-Photon Absorption

2009-10-19

arxiv.org/abs/0910.3581v2

Physics

Atomic Physics

Scientific paper

We present and implement a new scheme for independent control of both the final and the transient population utilizing the symmetry properties of the system. By proper pulse shaping, utilizing the invariance of the two-photon absorption to specific phase transformations of the pulse, different time evolutions of the transient population are photo-induced for a given (fixed) final state population. The model system is the Na atom. The work is conducted in the weak-field regime for which the transient two-photon excitation is described by second-order perturbation theory. One most attractive case is the extended family of third-order chirp pulses which control the population build-up duration independently of the final population.

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