Two-photon excitation of the metastable state of hydrogen assisted by laser-induced chirped Stark shifts and continuum structure

LP Yatsenko, VI Romanenko, BW Shore… - Physical Review A …, 2005 - APS
Physical Review A—Atomic, Molecular, and Optical Physics, 2005APS
Traditional two-photon excitation suffers from two difficulties that prevent complete
population transfer: dynamic Stark shifts and multiphoton ionization. We describe a
technique for overcoming these limitations by using a second field to control dynamic Stark
shifts via Stark-chirped rapid adiabatic passage (SCRAP) and simultaneously suppress
undesired photoionization via laser-induced continuum structure (LICS). We illustrate this
proposed procedure by numerical simulations of two-photon excitation of the metastable 2 s …
Traditional two-photon excitation suffers from two difficulties that prevent complete population transfer: dynamic Stark shifts and multiphoton ionization. We describe a technique for overcoming these limitations by using a second field to control dynamic Stark shifts via Stark-chirped rapid adiabatic passage (SCRAP) and simultaneously suppress undesired photoionization via laser-induced continuum structure (LICS). We illustrate this proposed procedure by numerical simulations of two-photon excitation of the metastable state of hydrogen, showing that efficient excitation can be expected when the two laser pulses are properly crafted.
American Physical Society
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