skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Interplay of the chirps and chirped pulse compression in a high-gain seeded free-electron laser

Abstract

In a seeded high-gain free-electron laser (FEL), where a coherent laser pulse interacts with an ultrarelativistic electron beam, the seed laser pulse can be frequency chirped, and the electron beam can be energy chirped. Besides these two chirps, the FEL interaction introduces an intrinsic frequency chirp in the FEL even if the above-mentioned two chirps are absent. We examine the interplay of these three chirps. The problem is formulated as an initial value problem and solved via a Green function approach. Besides the chirp evolution, we also give analytical expressions for the pulse duration and bandwidth of the FEL, which remains fully longitudinally coherent in the high-gain exponential growth regime. Because the chirps are normally introduced for a final compression of the FEL pulse, some conceptual issues are discussed. We show that to get a short pulse duration, an energy chirp in the electron beam is important.

Authors:
; ; ; ; ;  [1];  [2];  [2];  [2];  [3]
  1. Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309 (United States)
  2. (United States)
  3. (China)
Publication Date:
OSTI Identifier:
20929626
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of the Optical Society of America. Part B, Optical Physics; Journal Volume: 24; Journal Issue: 3; Other Information: DOI: 10.1364/JOSAB.24.000484; (c) 2007 Optical Society of America; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ELECTRON BEAMS; EVOLUTION; FREE ELECTRON LASERS; GREEN FUNCTION; MODULATION; PULSES; RELATIVISTIC RANGE

Citation Formats

Wu Juhao, Murphy, James B., Emma, Paul J., Wang Xijie, Watanabe, Takahiro, Zhong Xinming, National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973-5000, Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309, National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973-5000, and Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing 100875. Interplay of the chirps and chirped pulse compression in a high-gain seeded free-electron laser. United States: N. p., 2007. Web. doi:10.1364/JOSAB.24.000484.
Wu Juhao, Murphy, James B., Emma, Paul J., Wang Xijie, Watanabe, Takahiro, Zhong Xinming, National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973-5000, Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309, National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973-5000, & Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing 100875. Interplay of the chirps and chirped pulse compression in a high-gain seeded free-electron laser. United States. doi:10.1364/JOSAB.24.000484.
Wu Juhao, Murphy, James B., Emma, Paul J., Wang Xijie, Watanabe, Takahiro, Zhong Xinming, National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973-5000, Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309, National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973-5000, and Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing 100875. Thu . "Interplay of the chirps and chirped pulse compression in a high-gain seeded free-electron laser". United States. doi:10.1364/JOSAB.24.000484.
@article{osti_20929626,
title = {Interplay of the chirps and chirped pulse compression in a high-gain seeded free-electron laser},
author = {Wu Juhao and Murphy, James B. and Emma, Paul J. and Wang Xijie and Watanabe, Takahiro and Zhong Xinming and National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973-5000 and Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309 and National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973-5000 and Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing 100875},
abstractNote = {In a seeded high-gain free-electron laser (FEL), where a coherent laser pulse interacts with an ultrarelativistic electron beam, the seed laser pulse can be frequency chirped, and the electron beam can be energy chirped. Besides these two chirps, the FEL interaction introduces an intrinsic frequency chirp in the FEL even if the above-mentioned two chirps are absent. We examine the interplay of these three chirps. The problem is formulated as an initial value problem and solved via a Green function approach. Besides the chirp evolution, we also give analytical expressions for the pulse duration and bandwidth of the FEL, which remains fully longitudinally coherent in the high-gain exponential growth regime. Because the chirps are normally introduced for a final compression of the FEL pulse, some conceptual issues are discussed. We show that to get a short pulse duration, an energy chirp in the electron beam is important.},
doi = {10.1364/JOSAB.24.000484},
journal = {Journal of the Optical Society of America. Part B, Optical Physics},
number = 3,
volume = 24,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}
  • In a seeded high-gain Free-electron Laser (FEL), where a coherent laser pulse interacts with an ultra-relativistic electron beam, the seed laser pulse can be frequency chirped, and the electron beam can be energy chirped. Besides these two chirps, the FEL interaction introduces an intrinsic frequency chirp in the FEL even if the above mentioned two chirps are absent. In this paper we examine the interplay of these three chirps. The problem is formulated as an initial value problem, and solved via a Green function approach. Besides the chirp evolution, we also give analytical expressions for the pulse duration and bandwidthmore » of the FEL, which remains fully longitudinally coherent in the high gain exponential growth regime. Because the chirps are normally introduced for a final compression of the FEL pulse, some conceptual issues are discussed. We show that in order to get a short pulse duration, an energy chirp in the electron beam is necessary.« less
  • No abstract prepared.
  • When a short electron bunch traverses an undulator to radiate a wavelength longer than the bunch length, intense superradiance from the electron bunch can quickly deplete the electron’s kinetic energy and lead to generation of an isolated chirped radiation pulse. Here, we develop a theory to describe this novel chirped pulse radiation in a superradiant free-electron laser and show the opportunity to generate isolated few-cycle high-power radiation through chirped-pulse compression after the undulator. The theory is completely characterized by how fast the electron energy is depleted for a given length of an undulator. We further present two design examples atmore » the THz and extreme-ultraviolet wavelengths and numerically generate isolated three- and nine-cycle radiation pulses, respectively.« less
  • When a short electron bunch traverses an undulator to radiate a wavelength longer than the bunch length, intense superradiance from the electron bunch can quickly deplete the electron’s kinetic energy and lead to generation of an isolated chirped radiation pulse. Here, we develop a theory to describe this novel chirped pulse radiation in a superradiant free-electron laser and show the opportunity to generate isolated few-cycle high-power radiation through chirped-pulse compression after the undulator. The theory is completely characterized by how fast the electron energy is depleted for a given length of an undulator. We further present two design examples atmore » the THz and extreme-ultraviolet wavelengths and numerically generate isolated three- and nine-cycle radiation pulses, respectively.« less