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Laser lens for electrons

27.08.2009

A lens that creates attosecond pulses of electrons is quite possible, American scientists say. The processes associated with the movement of molecules last for femtoseconds. Thousands of times faster, in attoseconds, there are processes associated with the movement of electrons.

If you create a video camera that shoots at a rate of one frame per attosecond, it would make a film based on the story of the life of molecules. And this can be achieved - all you need is an ultrafast electron microscope with electron pulses that last such a short time.

Scientists from the University of Nebraska-Lincoln, led by Associate Professor Herman Batelaan, working with the laboratory of Nobel laureate in the field of femtosecond spectroscopy Ahmed Ziwail, calculated the possibility of creating temporary (emphasis on the last syllable) laser lenses.

In their opinion, such a lens obeys the laws that apply in ordinary, spatial optics, only it compresses the rays not in space, but in time. It follows from the calculation that with the help of a single laser beam it is possible to obtain electron pulses with a duration of less than 10 femtoseconds. Two laser beams directed towards each other must compress an electron pulse into attoseconds.

Now it's up to the experimenters who would like to put the theorists' prediction into practice.

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