Extension of Free-Electron Lasers into the Extreme Ultraviolet

1988 ◽  
Author(s):  
Brian E. Newnam
Keyword(s):  
Free Electron ◽  
Extreme Ultraviolet ◽  
Free Electron Lasers

scholarly journals Switching of the harmonic order in free-electron lasers by controlling the density modulation of an electron bunch

2018 ◽  
Vol 25 (5) ◽  
pp. 1317-1322 ◽  
Author(s):  
Norihiro Sei ◽  
Hiroshi Ogawa ◽  
QiKa Jia
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Extreme Ultraviolet ◽  
Free Electron Lasers ◽  
Harmonic Order ◽  
Third Harmonic ◽  
X Ray ◽  
The Third ◽  
Density Modulation ◽  
Higher Harmonic

It was demonstrated that harmonic order in free-electron laser (FEL) oscillations could be switched by adjusting the dispersive gap of the optical klystron ETLOK-III in the storage ring NIJI-IV. The effective gains for the fundamental and third-harmonic FEL oscillations were evaluated and it was confirmed that the FEL oscillated at the order of the harmonic with the higher effective gain. The ratio between the effective gain for the fundamental and that for the third harmonic was controlled by the dispersive gap. It was also demonstrated that a spectral measurement of the FEL-based Compton scattering X-ray beam was effective for directly observing the switching of the harmonic order. These results contribute to the development of higher-harmonic FEL oscillations suppressing the fundamental FEL oscillation in the extreme ultraviolet and X-ray regions.

scholarly journals Electron-bunch lengthening on higher-harmonic oscillations in storage-ring free-electron lasers

2017 ◽  
Vol 24 (5) ◽  
pp. 912-918 ◽  
Author(s):  
Norihiro Sei ◽  
Hiroshi Ogawa ◽  
Shuichi Okuda
Keyword(s):  
Electron Beam ◽  
Storage Ring ◽  
Free Electron ◽  
Free Electron Laser ◽  
Cavity Length ◽  
Extreme Ultraviolet ◽  
Bunch Length ◽  
Free Electron Lasers ◽  
X Ray ◽  
Higher Harmonic

The influence of higher-harmonic free-electron laser (FEL) oscillations on an electron beam have been studied by measuring its bunch length at the NIJI-IV storage ring. The bunch length and the lifetime of the electron beam were measured, and were observed to have become longer owing to harmonic lasing, which is in accord with the increase of the FEL gain. It was demonstrated that the saturated FEL power could be described by the theory of bunch heating, even for the harmonic lasing. Cavity-length detuning curves were measured for the harmonic lasing, and it was found that the width of the detuning curve was proportional to a parameter that depended on the bunch length. These experimental results will be useful for developing compact resonator-type FELs by using higher harmonics in the extreme-ultraviolet and the X-ray regions.

Multi-colour pulses from seeded free-electron-lasers: towards the development of non-linear core-level coherent spectroscopies

2014 ◽  
Vol 171 ◽  
pp. 487-503 ◽  
Author(s):  
Filippo Bencivenga ◽  
Flavio Capotondi ◽  
Francesco Casolari ◽  
Francesco Dallari ◽  
Miltcho B. Danailov ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Free Electron ◽  
Free Electron Laser ◽  
Extreme Ultraviolet ◽  
Core Level ◽  
Wave Mixing ◽  
Free Electron Lasers ◽  
Diffraction Experiment ◽  
X Ray ◽  
Ultrafast Science

We report on new opportunities for ultrafast science thanks to the use of two-colour extreme ultraviolet (XUV) pulses at the FERMI free electron laser (FEL) facility. The two pulses have been employed to carry out a pioneering FEL-pump/FEL-probe diffraction experiment using a Ti target and tuning the FEL pulses to the M2/3-edge in order to explore the dependence of the dielectric constant on the excitation fluence. The future impact that the use of such a two-colour FEL emission will have on the development of ultrafast wave-mixing methods in the XUV/soft X-ray range is addressed and discussed.

Free-electron laser multiplex driven by a superconducting linear accelerator

2016 ◽  
Vol 23 (5) ◽  
pp. 1070-1075 ◽  
Author(s):  
Tim Plath ◽  
Philipp Amstutz ◽  
Jörn Bödewadt ◽  
Günter Brenner ◽  
Nagitha Ekanayake ◽  
...  
Keyword(s):  
Research And Development ◽  
Free Electron ◽  
Free Electron Laser ◽  
Linear Accelerator ◽  
Extreme Ultraviolet ◽  
Free Electron Lasers ◽  
X Ray ◽  
User Facility ◽  
20 Nm ◽  
Simultaneous Lasing

Free-electron lasers (FELs) generate femtosecond XUV and X-ray pulses at peak powers in the gigawatt range. The FEL user facility FLASH at DESY (Hamburg, Germany) is driven by a superconducting linear accelerator with up to 8000 pulses per second. Since 2014, two parallel undulator beamlines, FLASH1 and FLASH2, have been in operation. In addition to the main undulator, the FLASH1 beamline is equipped with an undulator section, sFLASH, dedicated to research and development of fully coherent extreme ultraviolet photon pulses using external seed lasers. In this contribution, the first simultaneous lasing of the three FELs at 13.4 nm, 20 nm and 38.8 nm is presented.

scholarly journals Compression of Extreme-Ultraviolet Ultrashort Pulses by Grating Configurations

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Fabio Frassetto ◽  
Paolo Miotti ◽  
Luca Poletto
Keyword(s):  
Free Electron ◽  
Extreme Ultraviolet ◽  
Ultrashort Pulses ◽  
Spectral Phase ◽  
High Order ◽  
Free Electron Lasers ◽  
Main Application ◽  
Temporal Compression ◽  
Fourier Limit ◽  
Compression Of Pulses

The design and realization of grating instruments to condition the spectral phase of ultrashort extreme-ultraviolet pulses are discussed. The main application of such configurations is the temporal compression of pulses by compensating the phase chirp and getting close to the Fourier limit. We discuss the two configurations useful for the realization of ultrafast grating compressors, namely, the classical diffraction mount and the off-plane one. The configuration may be applied to free-electron lasers and high-order laser harmonics.

Coherent and transient states studied with extreme ultraviolet and X-ray free electron lasers: present and future prospects

2014 ◽  
Vol 63 (5-6) ◽  
pp. 327-404 ◽  
Author(s):  
F. Bencivenga ◽  
F. Capotondi ◽  
E. Principi ◽  
M. Kiskinova ◽  
C. Masciovecchio
Keyword(s):  
Free Electron ◽  
Extreme Ultraviolet ◽  
Free Electron Lasers ◽  
Future Prospects ◽  
X Ray ◽  
Transient States

Compact bolometric radiometer for free-electron lasers in a wavelength range from extreme-ultraviolet to x-rays

2017 ◽  
Vol 42 (22) ◽  
pp. 4776 ◽  
Author(s):  
Takahiro Tanaka ◽  
Masahiro Kato ◽  
Norio Saito ◽  
Shigeki Owada ◽  
Kensuke Tono ◽  
...  
Keyword(s):  
Wavelength Range ◽  
Free Electron ◽  
Extreme Ultraviolet ◽  
X Rays ◽  
Free Electron Lasers
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