Ramsey spectroscopy of bound atomic states with extreme-ultraviolet laser harmonics.
We report the experimental measurement of Ramsey interference fringes in the single-photon excitation to a high-lying bound state of atomic argon by pairs of phase-locked, time-delayed, extreme UV high-order-harmonic pulses at 87 nm. High-visibility Ramsey fringes are observed for delays larger than 100 ps, thus demonstrating a potential resolving power >10(5) at this wavelength.
LENS, Via Nello Carrara 1, 50019 Sesto Fiorentino, Firenze, Italy.
I
I
Liontos
S
S
Cavalieri
C
C
Corsi
R
R
Eramo
S
S
Kaziannis
A
A
Pirri
E
E
Sali
M
M
Bellini