An interesting feature of ultra-short pulsed lasers in MOPA-configuration is the so-called “burst” mode. It provides pulse packages at nanosecond separation using programmable power slopes. Thus, the energy distribution of the pulses within a burst can be adjusted to the specific application task. Using burst pulses, laser-material-interaction is brought into a different regime, as subsequent pulses hit preconditioned material and plasma effects can be used effectively.
Burst pulses can help optimizing surface quality and ablation rates of engraved structures simultaneously. For laser filamentation of transparent and brittle materials, burst pulses provide filaments lengths of several millimeters.