Phys. Rev. E 65, 066503 (2002) [4 pages]Amplified-spontaneous-emission power oscillation in a beam-wave interactionReceived 24 September 2001; revised 11 February 2002; published 11 June 2002 We present in this paper compelling evidence supporting the three-wave traveling-wave theory developed by Pierce fifty years ago. The transition in a Smith-Purcell free-electron laser from low, through moderate amplified spontaneous emission, to strong gain conditions was carefully controlled. Below threshold, the emitted far-infrared power exhibits oscillations with a cubic dependence on the electron beam current. Both characteristics are expected in a three-wave interaction yet, to date, have not been observed. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevE.65.066503
DOI:
10.1103/PhysRevE.65.066503
PACS:
41.60.-m, 84.40.Fe, 07.57.Hm, 42.60.Da
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