Journal
OPTICS EXPRESS
Volume 19, Issue 3, Pages 2266-2277Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.002266
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Funding
- Ministry of Education, Science and Technology [2009-0090843, 2010-0013899]
- Ministry of Education, Science & Technology (MoST), Republic of Korea [N10110041] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Council of Science & Technology (NST), Republic of Korea [K11001] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2009-0090843, 2010-0013899] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We demonstrate ultrafast coherent control of multiphoton absorption in a dynamically shifted energy level structure. In a three-level system that models optical interactions with sodium atoms, we control the quantum interference of sequential 2 + 1 photons and direct three-photon transitions. Dynamic change in energy levels predicts an enormous enhancement of vertical bar 7p >-state excitation in the strong-field regime by a negatively chirped pulse. In addition, the vertical bar 4s >-state excitation is enhanced symmetrically by nonzero linear chirp rates given as a function of laser peak intensity and laser detuning. Experiments performed by ultrafast shaped-pulse excitation of ground-state atomic sodium verifies the various strong-field contributions to vertical bar 3s >-vertical bar 7p > and vertical bar 3s >-vertical bar 4s > transitions. The result suggests that for systems of molecular level understanding adiabatic control approach with analytically shaped pulses becomes a more direct control than feedback-loop black-box approaches. (C) 2011 Optical Society of America
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