Abstract

We show that sufficiently strong laser beams with two frequencies differing by a cyclotron frequency of a free electron can give rise to strong cyclotron excitation with prohibited and allowed cyclotron orbits as well as to an optical Stark shift. This is due to a combination of relativistic effects and results in multiple isolated branches of excited motion (isolas). The formation of the first three-photon isola, when λcyclotron ≈ 2 mm and λlaser ≈ 10 μm, can be observed with the laser power as low as ≅ 10 mW.

© 1987 Optical Society of America

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