Ultrafast laser materials processing has undergone an important change with the
development of non-diffracting beams. These beams enable overcoming many of the …

Filament-induced ablation represents an attractive scheme for long-range material
identification via optical spectroscopy. However, the delivery of laser energy to the target can …

Our experiments show that the critical power for self-focusing collapse of femtosecond vortex
beams in air is significantly higher than that of a flattop beam and grows approximately …