Transform-limited pulses are not optimal for resonant multiphoton transitions

Details Transform-limited pulses are not optimal for resonant multiphoton transitions Transform-limited pulses are not optimal for resonant multiphoton transitions

2003-02-05

arxiv.org/abs/physics/0302014v1

Phys. Rev. Lett. 86, 47 (2001)

Physics

Atomic Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.86.47

Maximizing nonlinear light-matter interactions is a primary motive for compressing laser pulses to achieve ultrashort transform limited pulses. Here we show how, by appropriately shaping the pulses, resonant multiphoton transitions can be enhanced significantly beyond the level achieved by maximizing the pulse's peak intensity. We demonstrate the counterintuitive nature of this effect with an experiment in a resonant two-photon absorption, in which, by selectively removing certain spectral bands, the peak intensity of the pulse is reduced by a factor of 40, yet the absorption rate is doubled. Furthermore, by suitably designing the spectral phase of the pulse, we increase the absorption rate by a factor of 7.

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