Resonant enhancement of a single attosecond pulse in a gas medium by a time-delayed control field

Abstract

An optical coherent control scheme has been proposed and theoretically investigated where an extreme ultraviolet single attosecond pulse (SAP) propagates through a dense helium gas dressed by a time-delayed femtosecond laser pulse. The laser pulse couples the 2s2p(^1P) and 2s^2(^1S) autoionizing states when the SAP excites the 2s2p state. After going through the gas, the spectral and temporal profiles of the SAP are strongly distorted. A narrowed but enhanced spike in the spectrum shows up for specific intensities and time delays of the laser, which exemplifies the control of a broadband photon wave packet by an ultrashort dressing field for the first time. We analyze the photon and electron dynamics and conclude on the dressing condition that maximizes this enhancement. The result demonstrates new possibilities of attosecond optical control.

5 pages, 4 figures

References in corpus (5)

• Attosecond Control of Ionization Dynamics
• 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
• Electromagnetically induced transparency for x rays
• Photoabsorption of attosecond XUV light pulses by two strongly laser-coupled autoionizing states
• Laser-assisted-autoionization dynamics of helium resonances with single attosecond pulses

Cited by in corpus (4)

• Beyond the single-atom response in absorption lineshapes: Probing a dense, laser-dressed helium gas with attosecond pulse trains
• Some Exact Properties of the Nonequilibrium Response Function for Transient Photoabsorption
• Absorption and emission of single attosecond light pulses in an autoionizing gaseous medium dressed by a time-delayed control field
• Probing dipole-forbidden autoionizing states by isolated attosecond pulses