Figure 8.

Focusing performance of microlenses after exposure to $I_p$ = 1.27 GW/cm${}^2$ 515 nm 300 fs radiation in continuous (a) and multi-burst mode: 10 s exposure followed by a 10 s pause (b); (c) lateral distribution at the focus of microlenses exposed to 5 min of continuous radiation at $I_p$ = 1.91 GW/cm${}^2$ (515 nm 300 fs) achieved with repetition rates of 10, 100 and 200 kHz. The 10 kHz case also serves as a before image, as there were no changes in focusing properties after this experiment.