Direct interferometric measurement of the atomic dipole phase in high-order harmonic generation.
We report the first direct measurements of the atomic dipole phase in the process of high-order harmonic generation. Differently from previously reported studies based on frequency chirp measurements, we use extreme ultraviolet interferometry as the most natural and direct way to measure phase shifts. Our approach has the important advantage of allowing us to investigate the effects associated to both the main quantum paths involved in the emission of a particular harmonic, thus offering a particularly clear and simple picture of the underlying electronic dynamics.
Corsi
Chiara
C
LENS, Via Nello Carrara 1, 50019 Sesto Fiorentino, Florence, Italy.
Pirri
Angela
A
Sali
Emiliano
E
Tortora
Alessandra
A
Bellini
Marco
M