The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform
K Soong - One of the best experts on this subject based on the ideXlab platform.
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evidence of high harmonics from echo enabled harmonic generation for seeding x ray Free Electron Lasers
Physical Review Letters, 2012Co-Authors: Dao Xiang, E Colby, M Dunning, S Gilevich, C Hast, K Jobe, D Mccormick, Johanna Nelson, T O Raubenheimer, K SoongAbstract:Echo-enabled harmonic generation Free Electron Lasers hold great promise for the generation of fully coherent radiation in x-ray wavelengths. Here we report the first evidence of high harmonics from the echo-enabled harmonic generation technique in the realistic scenario where the laser energy modulation is comparable to the beam slice energy spread. In this experiment, coherent radiation at the seventh harmonic of the second seed laser is generated when the energy modulation amplitude is about 2-3 times the slice energy spread. The experiment confirms the underlying physics of echo-enabled harmonic generation and may have a strong impact on emerging seeded x-ray Free Electron Lasers that are capable of generating laserlike x rays which will advance many areas of science.
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demonstration of the echo enabled harmonic generation technique for short wavelength seeded Free Electron Lasers
Physical Review Letters, 2010Co-Authors: Dao Xiang, E Colby, M Dunning, S Gilevich, C Hast, K Jobe, D Mccormick, Johanna Nelson, T O Raubenheimer, K SoongAbstract:We report the first experimental demonstration of the echo-enabled harmonic generation technique, which holds great promise for generation of high-power, fully coherent short-wavelength radiation. In this experiment, coherent radiation at the 3rd and 4th harmonics of the second seed laser is generated from the so-called beam echo effect. The experiment confirms the physics behind this technique and paves the way for applying the echo-enabled harmonic generation technique for seeded x-ray Free Electron Lasers.
Marie-emmanuelle Couprie - One of the best experts on this subject based on the ideXlab platform.
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Historical Survey of Free Electron Lasers
2018Co-Authors: Marie-emmanuelle CouprieAbstract:Free Electron Lasers are presently unique tuneable powerful Lasers ranging from the infrared to the X-ray, serving for the exploration of light–matter interaction.They make use of a simple and elegant gain medium. The coherent radiation is generated using Free Electrons in a periodic permanent magnetic field generated by a so-called undulator as an amplification medium. The light–Electron interaction in the undulator leads to a bunching process, setting in phase the Electron emitters and establishing a longitudinal coherence. The amplifica-tion of the light wave takes place to the detriment of the kinetic energy of the Electrons. First, the origins of the Free Electron laser, starting from the photon–matter interaction, the early times of synchrotron radiation and the undulator, the development of vacuum tubes, masers, and Lasers are introduced. Then, motivated by the search of an exotic laser, the invention of the Free Electron conceptual idea laser is discussed, with a quantum approach followed by a classical one. The first low gain Free Electron laser experiments are then presented. Finally, some insight is given in the case of the high gain Free Electron Lasers.
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beam manipulation for compact laser wakefield accelerator based Free Electron Lasers
New Journal of Physics, 2015Co-Authors: A Loulergue, M Labat, C Evain, C Benabderrahmane, Victor Malka, Marie-emmanuelle CouprieAbstract:Free-Electron Lasers (FELs) are a unique source of light, particularly in the x-ray domain. After the success of FELs based on conventional acceleration using radio-frequency cavities, an important challenge is the development of FELs based on Electron bunching accelerated by a laser wakefield accelerator (LWFA). However, the present LWFA Electron bunch properties do not permit use directly for a significant FEL amplification. It is known that longitudinal decompression of Electron beams delivered by state-of-the-art LWFA eases the FEL process. We propose here a second order transverse beam manipulation turning the large inherent transverse chromatic emittances of LWFA beams into direct FEL gain advantage. Numerical simulations are presented showing that this beam manipulation can further enhance by orders of magnitude the peak power of the radiation.
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pulse splitting in short wavelength seeded Free Electron Lasers
Physical Review Letters, 2009Co-Authors: M Labat, N Y Joly, S Bielawski, C Szwaj, C Bruni, Marie-emmanuelle CouprieAbstract:We investigate a fundamental limitation occurring in vacuum ultraviolet and extreme ultraviolet seeded Free Electron Lasers (FELs). For a given Electron beam and undulator configuration, an increase of the FEL output energy at saturation can be obtained via an increase of the seed pulse duration. We put in evidence a complex spatiotemporal deformation of the amplified pulse, leading ultimately to a pulse splitting effect. Numerical studies of the Colson-Bonifacio FEL equations reveal that slippage length and seed laser pulse wings are core ingredients of the dynamics.
Dao Xiang - One of the best experts on this subject based on the ideXlab platform.
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evidence of high harmonics from echo enabled harmonic generation for seeding x ray Free Electron Lasers
Physical Review Letters, 2012Co-Authors: Dao Xiang, E Colby, M Dunning, S Gilevich, C Hast, K Jobe, D Mccormick, Johanna Nelson, T O Raubenheimer, K SoongAbstract:Echo-enabled harmonic generation Free Electron Lasers hold great promise for the generation of fully coherent radiation in x-ray wavelengths. Here we report the first evidence of high harmonics from the echo-enabled harmonic generation technique in the realistic scenario where the laser energy modulation is comparable to the beam slice energy spread. In this experiment, coherent radiation at the seventh harmonic of the second seed laser is generated when the energy modulation amplitude is about 2-3 times the slice energy spread. The experiment confirms the underlying physics of echo-enabled harmonic generation and may have a strong impact on emerging seeded x-ray Free Electron Lasers that are capable of generating laserlike x rays which will advance many areas of science.
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demonstration of the echo enabled harmonic generation technique for short wavelength seeded Free Electron Lasers
Physical Review Letters, 2010Co-Authors: Dao Xiang, E Colby, M Dunning, S Gilevich, C Hast, K Jobe, D Mccormick, Johanna Nelson, T O Raubenheimer, K SoongAbstract:We report the first experimental demonstration of the echo-enabled harmonic generation technique, which holds great promise for generation of high-power, fully coherent short-wavelength radiation. In this experiment, coherent radiation at the 3rd and 4th harmonics of the second seed laser is generated from the so-called beam echo effect. The experiment confirms the physics behind this technique and paves the way for applying the echo-enabled harmonic generation technique for seeded x-ray Free Electron Lasers.
S Gilevich - One of the best experts on this subject based on the ideXlab platform.
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optical shaping of x ray Free Electron Lasers
Physical Review Letters, 2016Co-Authors: A Marinelli, A Lutman, Timothy Maxwell, R Coffee, S Gilevich, Sharon Vetter, P Hering, G N West, Siqi Li, J GalaydaAbstract:In this Letter we report the experimental demonstration of a new temporal shaping technique for x-ray Free-Electron Lasers (FELs). This technique is based on the use of a spectrally shaped infrared (IR) laser and allows optical control of the x-ray generation process. By accurately manipulating the spectral amplitude and phase of the IR laser, we can selectively modify the Electron bunch longitudinal emittance thus controlling the duration of the resulting x-ray pulse down to the femtosecond time scale. Unlike other methods currently in use, optical shaping is directly applicable to the next generation of high-average power x-ray FELs such as the Linac Coherent Light Source-II or the European X-FEL, and it enables pulse shaping of FELs at the highest repetition rates. Furthermore, this laser-shaping technique paves the way for flexible tailoring of complex multicolor FEL pulse patterns required for nonlinear multidimensional x-ray spectroscopy as well as novel multicolor diffraction imaging schemes.
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evidence of high harmonics from echo enabled harmonic generation for seeding x ray Free Electron Lasers
Physical Review Letters, 2012Co-Authors: Dao Xiang, E Colby, M Dunning, S Gilevich, C Hast, K Jobe, D Mccormick, Johanna Nelson, T O Raubenheimer, K SoongAbstract:Echo-enabled harmonic generation Free Electron Lasers hold great promise for the generation of fully coherent radiation in x-ray wavelengths. Here we report the first evidence of high harmonics from the echo-enabled harmonic generation technique in the realistic scenario where the laser energy modulation is comparable to the beam slice energy spread. In this experiment, coherent radiation at the seventh harmonic of the second seed laser is generated when the energy modulation amplitude is about 2-3 times the slice energy spread. The experiment confirms the underlying physics of echo-enabled harmonic generation and may have a strong impact on emerging seeded x-ray Free Electron Lasers that are capable of generating laserlike x rays which will advance many areas of science.
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demonstration of the echo enabled harmonic generation technique for short wavelength seeded Free Electron Lasers
Physical Review Letters, 2010Co-Authors: Dao Xiang, E Colby, M Dunning, S Gilevich, C Hast, K Jobe, D Mccormick, Johanna Nelson, T O Raubenheimer, K SoongAbstract:We report the first experimental demonstration of the echo-enabled harmonic generation technique, which holds great promise for generation of high-power, fully coherent short-wavelength radiation. In this experiment, coherent radiation at the 3rd and 4th harmonics of the second seed laser is generated from the so-called beam echo effect. The experiment confirms the physics behind this technique and paves the way for applying the echo-enabled harmonic generation technique for seeded x-ray Free Electron Lasers.
M Labat - One of the best experts on this subject based on the ideXlab platform.
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beam manipulation for compact laser wakefield accelerator based Free Electron Lasers
New Journal of Physics, 2015Co-Authors: A Loulergue, M Labat, C Evain, C Benabderrahmane, Victor Malka, Marie-emmanuelle CouprieAbstract:Free-Electron Lasers (FELs) are a unique source of light, particularly in the x-ray domain. After the success of FELs based on conventional acceleration using radio-frequency cavities, an important challenge is the development of FELs based on Electron bunching accelerated by a laser wakefield accelerator (LWFA). However, the present LWFA Electron bunch properties do not permit use directly for a significant FEL amplification. It is known that longitudinal decompression of Electron beams delivered by state-of-the-art LWFA eases the FEL process. We propose here a second order transverse beam manipulation turning the large inherent transverse chromatic emittances of LWFA beams into direct FEL gain advantage. Numerical simulations are presented showing that this beam manipulation can further enhance by orders of magnitude the peak power of the radiation.
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pulse splitting in short wavelength seeded Free Electron Lasers
Physical Review Letters, 2009Co-Authors: M Labat, N Y Joly, S Bielawski, C Szwaj, C Bruni, Marie-emmanuelle CouprieAbstract:We investigate a fundamental limitation occurring in vacuum ultraviolet and extreme ultraviolet seeded Free Electron Lasers (FELs). For a given Electron beam and undulator configuration, an increase of the FEL output energy at saturation can be obtained via an increase of the seed pulse duration. We put in evidence a complex spatiotemporal deformation of the amplified pulse, leading ultimately to a pulse splitting effect. Numerical studies of the Colson-Bonifacio FEL equations reveal that slippage length and seed laser pulse wings are core ingredients of the dynamics.
