FIR optical cavity oscillation is observed with the AT&T Bell Laboratories free-electron laser

1991 ◽  
Author(s):  
Earl D. Shaw ◽  
Robert J. Chichester ◽  
A. La Porta
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Optical Cavity

scholarly journals Multiple-Collision Free-Electron Laser Compton Backscattering for a High-Yield Gamma-Ray Source

2020 ◽  
Vol 10 (4) ◽  
pp. 1418
Author(s):  
Norihiro Sei ◽  
Hiroshi Ogawa ◽  
QiKa Jia
Keyword(s):  
Gamma Rays ◽  
Free Electron ◽  
Free Electron Laser ◽  
Gamma Ray ◽  
Optical Cavity ◽  
High Yield ◽  
Multiple Collision ◽  
Collision Point ◽  
Compton Backscattering ◽  
Multiple Collisions

We observed multiple-collision free-electron laser (FEL)-Compton backscattering in which a multi-bunch electron beam makes head-on collisions with multi-pulse FELs in an optical cavity, using an infrared FEL system in the storage ring NIJI-IV. It was demonstrated that the measured spectrum of the multiple-collision FEL-Compton backscattering gamma rays was the summation of the spectra of the gamma rays generated at each collision point. Moreover, it was demonstrated that the spatial distribution of the multiple-collision FEL-Compton backscattering gamma rays was the summation of those of the gamma rays generated at each collision point. Our experimental results proved quantitatively that the multiple collisions in the FEL-Compton backscattering process are effective in increasing the yield of the gamma rays. By applying the multiple-collision FEL-Compton backscattering to high-repetition FEL devices such as energy recovery linac FELs, an unprecedented high-yield gamma-ray source with quasi-monochromaticity and wavelength tunability will be realized.

Sustained Saturation in a Free-Electron Laser Oscillator at Perfect Synchronism of an Optical Cavity

2001 ◽  
Vol 86 (25) ◽  
pp. 5707-5710 ◽  
Author(s):  
N. Nishimori ◽  
R. Hajima ◽  
R. Nagai ◽  
E. J. Minehara
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Optical Cavity ◽  
Laser Oscillator

scholarly journals Observation of terahertz coherent edge radiation amplified by infrared free-electron laser oscillations

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Norihiro Sei ◽  
Takeshi Sakai ◽  
Yasushi Hayakawa ◽  
Yoske Sumitomo ◽  
Kyoko Nogami ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Electron Distribution ◽  
Optical Cavity ◽  
Terahertz Range ◽  
Diffraction Loss ◽  
Coupling Device ◽  
Edge Radiation ◽  
Excellent Tool

AbstractA coupling device, which can extract coherent edge radiation (CER) from an optical cavity for a free-electron laser (FEL) without damaging the FEL due to diffraction loss, was developed at Nihon University. We successfully observed the CER beam with a power of 1 mW or more in the terahertz range during FEL oscillation. It is revealed that the CER power changed with the detuning of the optical cavity and the dependence of the CER power on the detuning length differs from that of the FEL power. The measured CER spectra indicate that the longitudinal electron distribution in a bunch is modulated by the FEL oscillation with a period corresponding to the FEL slippage length. We herein report the characteristics of the CER with FEL oscillation in detail. These results demonstrate that the CER is excellent tool to reveal the overall effect of FEL interaction on electron distribution in a bunch.

FAR INFRARED FREE ELECTRON LASER

1983 ◽  
Vol 44 (C1) ◽  
pp. C1-385-C1-385
Author(s):  
E. D. Shaw ◽  
R. M. Emanuelson ◽  
G. A. Herbster
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Far Infrared
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