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A femtosecond is one millionth of a nanosecond or 10-15 of a second and is a measurement sometimes used in laser technology.
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Femtosecond lasers
Devices producing energy pulses that utilize the ability of some substances to absorb electromagnetic energy and to re-radiate it as a highly focused beam of synchronized single-wavelength radiation.

"Femtosecond lasers are the fastest in the world and are capable of producing energy pulses that last a millionth of a billionth of a second and can be focused into beams less than one hundredth the diameter of a human hair."

This entry is located in the following unit: Femtolaser (page 1)