Coherent and spontaneous emission in the quantum free electron laser

Gordon R.M. Robb, Rodolfo Bonifacio

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We present an analysis of quantum free electron laser (QFEL) dynamics including the effects of spontaneous emission. The effects of spontaneous emission are undesirable for coherent short-wave generation using FELs and have been shown in previous studies to limit the capabilities of classical self amplified spontaneous emission (SASE)-FELs at short wavelengths ∼1 Å due to growth of electron beam energy spread. As one of the attractive features of the QFEL is its potential as a relatively compact coherent x-ray source, it is important to understand the role of spontaneous emission, but to date there has not been a model which is capable of consistently describing the dynamics of both coherent FEL emission and incoherent spontaneous emission. In this paper, we present such a model, and use it to show that the limitations imposed by spontaneous emission on coherent FEL operation are significantly different in the quantum regime to those in the classical regime. An example set of parameters constituting a QFEL using electron and laser parameters which satisfy the condition for neglect of spontaneous emission during coherent QFEL emission is presented.
LanguageEnglish
Article number073101
Number of pages5
JournalPhysics of Plasmas
Volume19
Issue number7
DOIs
Publication statusPublished - Jul 2012

Fingerprint

free electron lasers
spontaneous emission
x ray sources
wave generation
electron beams
wavelengths
lasers
electrons

Keywords

  • coherent
  • spontaneous emission
  • quantum free electron laser

Cite this

@article{3cd7b3da7e5c43f8818f1058072456aa,
title = "Coherent and spontaneous emission in the quantum free electron laser",
abstract = "We present an analysis of quantum free electron laser (QFEL) dynamics including the effects of spontaneous emission. The effects of spontaneous emission are undesirable for coherent short-wave generation using FELs and have been shown in previous studies to limit the capabilities of classical self amplified spontaneous emission (SASE)-FELs at short wavelengths ∼1 {\AA} due to growth of electron beam energy spread. As one of the attractive features of the QFEL is its potential as a relatively compact coherent x-ray source, it is important to understand the role of spontaneous emission, but to date there has not been a model which is capable of consistently describing the dynamics of both coherent FEL emission and incoherent spontaneous emission. In this paper, we present such a model, and use it to show that the limitations imposed by spontaneous emission on coherent FEL operation are significantly different in the quantum regime to those in the classical regime. An example set of parameters constituting a QFEL using electron and laser parameters which satisfy the condition for neglect of spontaneous emission during coherent QFEL emission is presented.",
keywords = "coherent, spontaneous emission , quantum free electron laser",
author = "Robb, {Gordon R.M.} and Rodolfo Bonifacio",
year = "2012",
month = "7",
doi = "10.1063/1.4729337",
language = "English",
volume = "19",
journal = "Physics of Plasmas",
issn = "1070-664X",
number = "7",

}

Coherent and spontaneous emission in the quantum free electron laser. / Robb, Gordon R.M.; Bonifacio, Rodolfo.

In: Physics of Plasmas, Vol. 19, No. 7, 073101, 07.2012.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Coherent and spontaneous emission in the quantum free electron laser

AU - Robb, Gordon R.M.

AU - Bonifacio, Rodolfo

PY - 2012/7

Y1 - 2012/7

N2 - We present an analysis of quantum free electron laser (QFEL) dynamics including the effects of spontaneous emission. The effects of spontaneous emission are undesirable for coherent short-wave generation using FELs and have been shown in previous studies to limit the capabilities of classical self amplified spontaneous emission (SASE)-FELs at short wavelengths ∼1 Å due to growth of electron beam energy spread. As one of the attractive features of the QFEL is its potential as a relatively compact coherent x-ray source, it is important to understand the role of spontaneous emission, but to date there has not been a model which is capable of consistently describing the dynamics of both coherent FEL emission and incoherent spontaneous emission. In this paper, we present such a model, and use it to show that the limitations imposed by spontaneous emission on coherent FEL operation are significantly different in the quantum regime to those in the classical regime. An example set of parameters constituting a QFEL using electron and laser parameters which satisfy the condition for neglect of spontaneous emission during coherent QFEL emission is presented.

AB - We present an analysis of quantum free electron laser (QFEL) dynamics including the effects of spontaneous emission. The effects of spontaneous emission are undesirable for coherent short-wave generation using FELs and have been shown in previous studies to limit the capabilities of classical self amplified spontaneous emission (SASE)-FELs at short wavelengths ∼1 Å due to growth of electron beam energy spread. As one of the attractive features of the QFEL is its potential as a relatively compact coherent x-ray source, it is important to understand the role of spontaneous emission, but to date there has not been a model which is capable of consistently describing the dynamics of both coherent FEL emission and incoherent spontaneous emission. In this paper, we present such a model, and use it to show that the limitations imposed by spontaneous emission on coherent FEL operation are significantly different in the quantum regime to those in the classical regime. An example set of parameters constituting a QFEL using electron and laser parameters which satisfy the condition for neglect of spontaneous emission during coherent QFEL emission is presented.

KW - coherent

KW - spontaneous emission

KW - quantum free electron laser

UR - http://www.scopus.com/inward/record.url?scp=84866936178&partnerID=8YFLogxK

U2 - 10.1063/1.4729337

DO - 10.1063/1.4729337

M3 - Article

VL - 19

JO - Physics of Plasmas

T2 - Physics of Plasmas

JF - Physics of Plasmas

SN - 1070-664X

IS - 7

M1 - 073101

ER -