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Femtosecond high-order harmonic transient absorption spectroscopy is used toobserve electromagnetically induced transparency-like behavior as well asinduced absorption in the extreme ultraviolet by laser dressing of the He 2s2p(1Po) and 2p2 (1Se) double excitation states with an intense 800 nm field.Probing in the vicinity of the 1s2 \to 2s2p transition at 60.15 eV reveals theformation of an Autler-Townes doublet due to coherent coupling of the doubleexcitation states. Qualitative agreement with the experimental spectra isobtained only when optical field ionization of both double excitation statesinto the N = 2 continuum is included in the theoretical model. Because the Fanoq-parameter of the unperturbed probe transition is finite, the laser-dressed Heatom exhibits both enhanced transparency and absorption at negative andpositive probe energy detunings, respectively.

chemical physics

Femtosecond induced transparency and absorption in the extreme  ultraviolet by coherent coupling of the He 2s2p (1P0) and 2p2 (1Se) double  excitation states with 800 nm light