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Physical Review Letters

Generation of Squeezed Coherent States via a Free-Electron Laser

Wilhelm Becker, Marlan O. Scully, Muhammad Suhail Zubairy

Published Feb 15, 1982• 98 citations
Publisher

Abstract

Spontaneous radiation from a magnetic wiggler or undulator as used in a free-electron laser is shown to be in a squeezed state for a low-density electron beam. It is pointed out that the problem is formally analogous to radiation from a Josephson junction.
DOI
10.1103/physrevlett.48.475

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Starting from an initial state with an electron energy p02{\mathit{p}}_{0}^{2}p02​/2m+\ensuremath{\Elzxh}${\mathrm{\ensuremath{\omega}}}_{\mathit{c}}$/2, a vacuum-laser field, and a coherent wiggler field, I discuss photon statistics in a free-electron laser with an axial-guide magnetic field. It is found that the axial field can weaken the squeezing, enhance the positive (for \ensuremath{\theta}>0) and negative (for \ensuremath{\theta}0) gain, and strengthen the bunching (for \ensuremath{\theta}>0) and antibunching (for \ensuremath{\theta}0).
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