Wave profile modification (optical guiding) induced by free-electron laser interaction
- 14 September 1987
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 59 (11) , 1177-1180
- https://doi.org/10.1103/physrevlett.59.1177
Abstract
Modification of the transverse intensity profile of a single electromagnetic waveguide mode during the free-electron laser (FEL) interaction has been measured. This effect is the waveguide analog to free-space optical guiding. The studies were carried out at microwave frequencies (8–12 GHz) in a FEL with use of a mildly relativistic electron beam of ≃200 kV energy and ≃1.0 A current. The probing of the rf fields was accomplished by small electric dipole antennas inserted in the interaction region. The observed intensity profiles are compared with the measured FEL-induced phase shifts (wave refractive index).Keywords
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