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Physical Review A

Photon statistics in a free-electron laser with an axial-guide magnetic field

San-kui Gou

Published Jul 1, 1992• 6 citations
Publisher

Abstract

Starting from an initial state with an electron energy ${\mathit{p}}_{0}^{2}$/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).

DOI
10.1103/physreva.46.1140

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Starting from an initial state with an electron energy p02{\mathit{p}}_{0}^{2}p02​/2m+\ensuremath{\Elzxh}\ensuremathωc{\mathrm{\ensuremath{\omega}}}_{\mathit{c}}\ensuremathωc​/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).
We discuss the problem of photon quantum statistics of a single particle free-electron laser (FEL) amplifier in the small-signal cold beam regime to first order in the electron quantum recoil. The initial radiation wave is an arbitrary coherent state. We show that Glauber coherence is not preserved by the FEL interaction if the initial coherent state is not the vacuum, even if we neglect the electron quantum recoil (absence of gain). We evaluate the first two moments of the final photon distribution and find sub- (super)-Poissonian photon statistics for a negative (positive) resonance parameter.
We discuss the problem of photon quantum statistics of a single particle Free Electron Laser (FEL) amplifier in the small-signal cold beam regime to first order in the electron quantum recoil. The initial radiation wave is an arbitrary coherent state. We show that Glauber coherence is not preserved by the FEL interaction if the initial coherent state is not the vacuum even if we neglect the electron quantum recoil (absence of gain). We evaluate the first two moments of the final photon distribution and find sub (super)-poissonian photo statistics for negative (positive) resonance parameter.