Competition between coherent emission and broadband spontaneous emission in the quantum free electron laser

Gordon Robb, Rodolfo Bonifacio

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We extend previous analyses of spontaneous emission in a quantum free electron laser (QFEL) and competition between spontaneous and coherent QFEL emission to include a broad distribution of photon frequencies and momenta appropriate for spontaneous undulator radiation. We show that although the predictions of monochromatic and broadband models predict different electron momentum distributions for the quantum regime due to spontaneous emission alone after many photon emissions, the inclusion of broadband spontaneous emission has a negligible effect on the competition between spontaneous and coherent emission in the QFEL. Numerical results from both models are well described by the same condition for the threshold/critical value of spontaneous emission rate.
LanguageEnglish
JournalPhysics of Plasmas
Volume20
Issue number3
DOIs
Publication statusPublished - 1 Mar 2013

Fingerprint

free electron lasers
spontaneous emission
broadband
momentum
photons
inclusions
thresholds
radiation
predictions
electrons

Keywords

  • spontaneous emission
  • free electron lasers
  • photons
  • undulator radiation

Cite this

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Competition between coherent emission and broadband spontaneous emission in the quantum free electron laser. / Robb, Gordon; Bonifacio, Rodolfo.

In: Physics of Plasmas, Vol. 20, No. 3, 01.03.2013.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Competition between coherent emission and broadband spontaneous emission in the quantum free electron laser

AU - Robb, Gordon

AU - Bonifacio, Rodolfo

PY - 2013/3/1

Y1 - 2013/3/1

N2 - We extend previous analyses of spontaneous emission in a quantum free electron laser (QFEL) and competition between spontaneous and coherent QFEL emission to include a broad distribution of photon frequencies and momenta appropriate for spontaneous undulator radiation. We show that although the predictions of monochromatic and broadband models predict different electron momentum distributions for the quantum regime due to spontaneous emission alone after many photon emissions, the inclusion of broadband spontaneous emission has a negligible effect on the competition between spontaneous and coherent emission in the QFEL. Numerical results from both models are well described by the same condition for the threshold/critical value of spontaneous emission rate.

AB - We extend previous analyses of spontaneous emission in a quantum free electron laser (QFEL) and competition between spontaneous and coherent QFEL emission to include a broad distribution of photon frequencies and momenta appropriate for spontaneous undulator radiation. We show that although the predictions of monochromatic and broadband models predict different electron momentum distributions for the quantum regime due to spontaneous emission alone after many photon emissions, the inclusion of broadband spontaneous emission has a negligible effect on the competition between spontaneous and coherent emission in the QFEL. Numerical results from both models are well described by the same condition for the threshold/critical value of spontaneous emission rate.

KW - spontaneous emission

KW - free electron lasers

KW - photons

KW - undulator radiation

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