Attosecond…  XUV pulse duration dependence (no chirp)
n Energy width decreases as
pulse duration increases
n The angular distribution of
final momentum
q For given energy
q broader as XUV pulse
duration increases
n For XUV duration
approaching laser cycle:
q image expands in all
direction
q Sidebands begin to emerge
0.2 fs
0.5 fs
2 fs
no laser
Ex
AL
13