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Applied Physics B

Absorption and emission control in a femtosecond-dephasing medium via quantum coherence

H. Nishioka, Kenji Ueda

Published Jun 1, 2002• 3 citations
Publisher
DOI
10.1007/s00340-002-0896-6

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Summary form only given. We have demonstrated absorption enhancement and emission suppression by the coherence control in the fs-dephasing medium. The ultra-broadband differential phase excitation controls the coupling between multiple energy levels. The pumping scheme is possibly applied to further broadband materials for the control of general material properties unlimited within the optical characteristics. Especially, coherence control by the UV and VUV broadband excitations coupling to the same continuum drastically changes ionization and reaction properties of material. Applications for reaction control, material processing, or optical control of short wavelength system, that are essentially connecting with their short-live and ultra-broadband nature may be remarkable future of this scheme.
A sequence of two femtosecond coherent pulses--a strong pi-polarized pulse and a weak sigma-polarized pulse--excite the S1/2-P1/2 transition of atomic rubidium in an optically dense vapor. The sigma pulse induces transitions between the adiabatic states with a coupling strength that is different for identically and oppositely light-shifted coupled states, and that can be modified by tuning the relative phase between the pulses. An efficient control of the medium gain for the sigma pulse is experimentally demonstrated. It is shown to be the result of interference between the absorption and the stimulated emission paths for sigma photons.