Absolute time-resolved x-ray laser gain measurement.
We present the first direct measurement of the time evolution of the gain of a soft x-ray laser amplifier. The measurement is based on the injection of a seed pulse, obtained by high-order harmonic generation, into an x-ray laser medium. Strong amplification occurs when the seed pulse is synchronized with the gain period. By precisely varying the delay between the x-ray laser plasma creation and the seed pulse injection, the actual temporal evolution of the soft x-ray amplifier gain is obtained with a subpicosecond resolution.
Mocek
T
T
Laboratoire d'Optique Appliquée, ENSTA-Ecole Polytechnique, Chemin de la Hunière, 91761 Palaiseau, France.
Sebban
S
S
Maynard
G
G
Zeitoun
Ph
P
Faivre
G
G
Hallou
A
A
Fajardo
M
M
Kazamias
S
S
Cros
B
B
Aubert
D
D
de Lachèze-Murel
G
G
Rousseau
J P
JP
Dubau
J
J