Phys. Rev. Lett. 64, 2511–2514 (1990)Ion-channel laserReceived 5 February 1990; published in the issue dated 21 May 1990 A relativistic electron beam propagating through a plasma in the ion-focused regime exhibits an electromagnetic instability with peak growth rate near a resonant frequency ω∼2γ2ωβ. Growth is enhanced by optical guiding in the ion channel, which acts as a dielectric waveguide, with fiber parameter V∼1(I/IA)1/2. A 1D theory for a laser making use of this instability is formulated, scaling laws are derived, and numerical examples are given. Possible experimental evidence is noted. © 1990 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.64.2511
DOI:
10.1103/PhysRevLett.64.2511
PACS:
42.55.Tb, 41.80.Ee, 52.40.Mj
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