Smith-Purcell effect

Smith-Purcell effect

The Smith-Purcell effect was the precursor of the free electron laser (FEL). It was studied by Steve Smith, a graduate student under the guidance of Edward Purcell. In their experiment, they sent an energetic beam of electrons very closely parallel to the surface of a ruled optical diffraction grating, and thereby generated visible light. Smith showed there was negligible effect on the trajectory of the inducing electrons. Essentially, this is a form of Cherenkov radiation where the phase velocity of the light has been altered by the periodic grating.

References

* S. J. Smith and E. M. Purcell, "Visible Light from Localized Surface Charges Moving across a Grating", Phys Rev 92, 1069 (1953) [http://link.aps.org/abstract/PR/v92/p1069]


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