Measurement of the Transverse Mode Excitation in the Stimulated Emission of the ACO Free Electron Laser

1984 ◽  
Author(s):  
David A. Deacon
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Transverse Mode ◽  
Stimulated Emission ◽  
Mode Excitation

Transverse Mode Dynamics in a Free Electron Laser.

1983 ◽  
Author(s):  
P. Elleaume ◽  
D. A. G. Deacon
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Transverse Mode

Measurement of stimulated transverse mode mixing in a free electron laser

1985 ◽  
Vol 21 (3) ◽  
pp. 208-215 ◽  
Author(s):  
D. Deacon ◽  
P. Elleaume ◽  
M. Xie ◽  
C. Bazin ◽  
M. Bergher ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Transverse Mode ◽  
Mode Mixing

Classical free-electron lasing in an undulating electrostatic field in the axial direction

1992 ◽  
Vol 47 (2) ◽  
pp. 197-217 ◽  
Author(s):  
S. H. Kim
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Laser Field ◽  
Laser Cavity ◽  
Axial Direction ◽  
Stimulated Emission ◽  
Spectral Lines ◽  
Quantum Mechanical ◽  
Electron Mass ◽  
Fundamental Line

It is shown that the phase of the electromagnetic wave emitted through stimulated emission is intrinsically random. The insensitivity of the phase of the laser field to any disturbance in the laser cavity parameter derives from the fact that stimulated and spontaneous emissions take place concurrently at the same wave vector, the phases of spontaneous emission are mildly bunched, and the central limit theorem can be applied to the phase of the laser field. The two spectral lines observed in the Smith-Purcell free-electron laser experiment show that both classical and quantum-mechanical free-electron lasings, in which the wigglers behave as classical waves and wiggler quanta respectively, take place concurrently at different laser wavelengths in the case of the electric wiggler. It is shown that the coherence of the classical free-electron laser is achieved through modulation of the relativistic electron mass by the electric wiggler. The classical free-electron lasing is calculated using the quantum-augmented classical theory. In this, the probability of stimulated emission is first evaluated by interpreting the classically derived energy exchange between an electron and the laser field from a quantum-mechanical viewpoint. Then the laser gain is obtained from this probability by using a relationship between the two quantities derived by quantum kinetics. The wavelength of the fundamental line of classical free-electron lasing is twice the wavelength of the fundamental line of the free-electron two-quantum Stark emission, which is the quantum free-electron lasing in the electric wiggler. The gain of the classical free-electron lasing appears to scale as λ3w/γ3, where γ is the Lorentz factor of the electron beam and λw is the wavelength of the wiggler.

Transverse mode effects in free-electron laser oscillations

1994 ◽  
Author(s):  
Robert K. Wong ◽  
William B. Colson
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Transverse Mode ◽  
Mode Effects

Control of transverse mode content and polarization structure of terahertz coherent beams

2019 ◽  
Vol 43 (6) ◽  
pp. 1103-1108
Author(s):  
V.S. Pavelyev ◽  
Yu.Yu. Choporova ◽  
N.D. Osintseva ◽  
K.N. Tukmakov ◽  
B.A. Knyazev
Keyword(s):  
Terahertz Radiation ◽  
Free Electron ◽  
Free Electron Laser ◽  
Transverse Mode ◽  
Diffractive Optical Elements ◽  
Optical Elements ◽  
Polarization Structure ◽  
Mode Content ◽  
Coherent Beams ◽  
Illuminating Beam

The paper is devoted to investigation of forming multimode coherent beams of terahertz radiation with pre-given transverse mode content and terahertz vector beams by use of silicon diffractive optical elements forming single modes from terahertz free-electron laser illuminating beam.

scholarly journals CHANNELING OF POSITRONS THROUGH PERIODICALLY BENT CRYSTALS: ON THE FEASIBILITY OF CRYSTALLINE UNDULATOR AND GAMMA-LASER

2004 ◽  
Vol 13 (05) ◽  
pp. 867-916 ◽  
Author(s):  
A. V. KOROL ◽  
A. V. SOLOV'YOV ◽  
W. GREINER
Keyword(s):  
Electromagnetic Radiation ◽  
Free Electron ◽  
Free Electron Laser ◽  
Interplanar Spacing ◽  
High Energy ◽  
Literature Survey ◽  
Stimulated Emission ◽  
Spontaneous Radiation ◽  
Spectral Distributions ◽  
Bent Crystals

The electromagnetic radiation generated by ultra-relativistic positrons channeling in a crystalline undulator is discussed. The crystalline undulator is a crystal whose planes are bent periodically with the amplitude much larger than the interplanar spacing. Various conditions and criteria to be fulfilled for the crystalline undulator operation are established. Different methods of crystal bending are described. We present the results of numeric calculations of spectral distributions of the spontaneous radiation emitted in the crystalline undulator and discuss the possibility to create the stimulated emission in such a system in analogy with the free electron laser. A careful literature survey covering the formulation of all essential ideas in this field is given. Our investigation shows that the proposed mechanism provides an efficient source for high energy photons, which is worth studying experimentally.

Transverse mode dynamics in a free-electron laser

1984 ◽  
Vol 33 (1) ◽  
pp. 9-16 ◽  
Author(s):  
P. Elleaume ◽  
D. A. G. Deacon
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Transverse Mode
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