Ultrafast lasers are advanced laser systems that emit light pulses lasting only a few femtoseconds, which is one quadrillionth of a second. These brief pulses allow for precise control over light-matter interactions, making them useful in various scientific and industrial applications, such as medical imaging, material processing, and spectroscopy. The technology behind ultrafast lasers often involves solid-state laser systems or fiber lasers, which can generate high peak power while maintaining a low average power. Researchers use these lasers to study rapid processes in physics and chemistry, enabling breakthroughs in fields like nanotechnology and biophysics.