Attophysics was developed since 2001 when pulses and trains of attopulses (ATPT) with durations of hundreds of attoseconds were obtained. One attosecond (1 as= 10-18 s) is a thousandth of a millionth of millionth of a second. The characterization of these ATPT may be performed through a scheme called RABBITT (Reconstruction of Attosecond Beating by Interference of Two-photon Transitions). In such scheme, the ATPT ionizes an atomic target in the presence of an assistant near infrared (NIR) laser of low intensity.


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In 2001 a breakthrough is recorded in laser history when the barrier of femtoseconds (1fs=10-15 s, i.e., thousand times shorter than a millionth of a millionth of a second) was broken in the pulse duration with the obtention of the first pulsed lasers with durations of some hundreds of attoseconds (1 as= 10-18 s, thousand times shorter than a femtosecond). This has created the 'attophysics' field where the prototype of basic reaction is the ionization of atoms and molecules by 'attopulses' in the presence of a near infrared laser (NIR).
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