Experimental investigation of electromagnetically pumped free-electron-laser

Jianqiang Wu

doi:10.1117/12.2297961

1 October 1991 Experimental investigation of electromagnetically pumped free-electron-laser

Jianqiang Wu

Proceedings Volume 1576, 16th International Conference on Infrared and Millimeter Waves; 15766W (1991) https://doi.org/10.1117/12.2297961
Event: 16th International Conference on Infrared and Millimeter Waves, 1991, Lausanne, Switzerland

Abstract

Free-electron-laser (FEL) offers the promise of a continuously tunable source of extremly high-power coherent radiation from millimeter waves to visible wavelengths. And a great deal of attention has been focused on the electromagnetically pumped FEL(EM-FEL) in recent years due to the potential of short-wavelength operation with electron beams of relatively modest energy. In the case of a magnetostatic wiggler, the wavelength of the output radiation scales as λ≈λ_w/2Υ² where λ_w denotes the wiggler period and Υ is the relativistic factor for the beam. In contrast, the wavelength of the output radiation for an electromagnetic-wave wiggler scales as λ≈λ_w/4Υ². As a result , for fixed wiggler periods and electron beam energies, the electromagnetic-wave wiggler will produce shorter output wavelength. Although various proposals for developing short-period magnetostatic wigglers and the associated electron beam technology are being studied, there are still many difficulties to overcome in order to get shorter or/and visible output wavelengths of FEL. On the other hand, The EM-FEL can produce any given laser frequency with electron beam of modest energy using a variety of wavelengths' electromagnetic-wave wigglers in principle.

Citation Download Citation

Jianqiang Wu "Experimental investigation of electromagnetically pumped free-electron-laser", Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 15766W (1 October 1991); https://doi.org/10.1117/12.2297961

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