A femtosecond (0.000,000,000,000,001 s) is an unimaginably short time. While light travels around the Earth more than seven times in one second, it only travels one-hundredth of the thickness of a hair in a femtosecond (fs).

For some time now, ultra-fast lasers have been on the market with a stream of extremely short, high intensity light pulses, each lasting for only a few femtoseconds. Such lasers break all records: the output during the short pulse is equal to that of 100 atomic power stations, and its light intensity can be compared to the intensity of the sunlight falling on Earth bundled in the tip of a pencil.

 Femtosecond lasers are used for drilling holes in injection nozzles for cars, for performing eye surgery and for the painless treatment of tooth

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