[chongli]

Pulsed femtosecond lasers have repeat rates in the megahertz.

Not for petawatt lasers, those are around 1Hz or lower [1].

[1] http://www.eli-np.ro/research-activities-ra1.php

[Retric]

Both systems are cutting edge and a the limit of what we can build. They are not using a continuous beam because it’s inherently better, they are using it because it’s the best compromise.