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Title: Broadband THz amplification and superradiant spontaneous emission in a guided FEL

Abstract

While significant progress has been made to fill the “THz gap”, critical applications requiring powerful and energy efficient THz sources and amplifiers, from high frequency communications to medical and security imaging and nonlinear spectroscopy, continue to drive research on new methods of THz generation. Here we demonstrate a Free Electron Laser (FEL) THz source based on a novel interaction regime where broadband THz pulses can be phase and group velocity matched to the electron beam in a magnetic undulator via dispersion in a waveguide. Using < 10 pC, 6 MeV electron beams we show amplification of broadband THz pulses and demonstrate THz generation via both stimulated emission and spontaneous coherent superradiant emission, due to the short bunch length (< 200 fs rms) relative to resonant THz frequency (0.8 THz). A newly developed multifrequency simulation, designed to model the special case of guided FEL interaction, is benchmarked with the experiments and then used to extrapolate the capabilities of this “zero-slippage” FEL to efficient, tunable generation of > 100 μJ THz pulses when using higher (200 pC) beam charges and a tapered resonant condition.

Authors:
ORCiD logo; ; ;
Publication Date:
Research Org.:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF); US-Israel Binational Science Foundation (BSF)
OSTI Identifier:
1532591
Alternate Identifier(s):
OSTI ID: 1611227
Grant/Contract Number:  
SC0009914; PHY-1734215
Resource Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Name: Optics Express Journal Volume: 27 Journal Issue: 15; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; optics

Citation Formats

Snively, E. C., Xiong, J., Musumeci, P., and Gover, A. Broadband THz amplification and superradiant spontaneous emission in a guided FEL. United States: N. p., 2019. Web. doi:10.1364/OE.27.020221.
Snively, E. C., Xiong, J., Musumeci, P., & Gover, A. Broadband THz amplification and superradiant spontaneous emission in a guided FEL. United States. https://doi.org/10.1364/OE.27.020221
Snively, E. C., Xiong, J., Musumeci, P., and Gover, A. Tue . "Broadband THz amplification and superradiant spontaneous emission in a guided FEL". United States. https://doi.org/10.1364/OE.27.020221.
@article{osti_1532591,
title = {Broadband THz amplification and superradiant spontaneous emission in a guided FEL},
author = {Snively, E. C. and Xiong, J. and Musumeci, P. and Gover, A.},
abstractNote = {While significant progress has been made to fill the “THz gap”, critical applications requiring powerful and energy efficient THz sources and amplifiers, from high frequency communications to medical and security imaging and nonlinear spectroscopy, continue to drive research on new methods of THz generation. Here we demonstrate a Free Electron Laser (FEL) THz source based on a novel interaction regime where broadband THz pulses can be phase and group velocity matched to the electron beam in a magnetic undulator via dispersion in a waveguide. Using < 10 pC, 6 MeV electron beams we show amplification of broadband THz pulses and demonstrate THz generation via both stimulated emission and spontaneous coherent superradiant emission, due to the short bunch length (< 200 fs rms) relative to resonant THz frequency (0.8 THz). A newly developed multifrequency simulation, designed to model the special case of guided FEL interaction, is benchmarked with the experiments and then used to extrapolate the capabilities of this “zero-slippage” FEL to efficient, tunable generation of > 100 μJ THz pulses when using higher (200 pC) beam charges and a tapered resonant condition.},
doi = {10.1364/OE.27.020221},
journal = {Optics Express},
number = 15,
volume = 27,
place = {United States},
year = {2019},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.1364/OE.27.020221

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