Pulse-front control of 15-TW pulses with a tilted compressor, and application to the subpicosecond traveling-wave pumping of a soft-x-ray laser

Chanteloup, Jean-Christophe; Salmon, Estelle; Sauteret, C.; Migus, A.; Zeitoun, Philippe; Klisnick, A.; Carillon, A.; Hubert, Stéphane; Ros, D.; Nickles, P. V.; Kalachnikov, M.P.

doi:10.1364/josab.17.000151

Cited by 58 publications

(20 citation statements)

References 20 publications

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“…Additional measures were thus required to reduce the excitation velocity to c. This was accomplished by introducing a slight tilt on one of the compressor gratings. 8 Calculations showed that, in order to reduce the traveling-wave velocity to v exc = c, the second compressor grating needed to be tilted by 0.09° and shifted by ~11 mm along the incident beam direction. The pulse front velocity along the line focus was subsequently measured at the target position using an optical streak camera (Imacon 600) and yielded a value of v exc = (1.02 ∀ 0.03)c.…”

Section: Methodsmentioning

confidence: 99%

Sub-10-nm wavelength Ni-like-ion collisional x-ray lasers

et al. 2011

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We report on recent progress achieved in x-ray laser research at the University of Bern. Using the existing 10-TW Nd:glass CPA (chirped-pulse amplification) laser system in the grazing-incidence pumping (GRIP) scheme, saturated xray lasing is demonstrated on the 4d → 4p, J = 0-1 line of Ba at a wavelength of 9.2 nm, using a main pulse energy of 9 J. A small-signal gain coefficient of ~30 cm -1 and a gain-length product of ~16 at saturation have been measured. Crucial to these results was the introduction of a second, relatively intense (~10%) prepulse less than ~100 ps before the 1.5-ps duration main pulse, in addition to the 2.8% prepulse that irradiated the target 2.4 ns earlier. Travelling-wave excitation was used throughout. For handling convenience, compound targets (BaF 2 , LaF 3 ) were used, either in the form of windows or coated onto glass slides.

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Section: Methodsmentioning

confidence: 99%

Sub-10-nm wavelength Ni-like-ion collisional x-ray lasers

et al. 2011

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“…2(b), showing a monotonic increase of the velocity. It is known that rotation of the second compressor grating can be used to introduce an initial pulse-front tilt [18] that changes the average TWE velocity, v TW , along the line focus. Now using the analytic solution [Eq.…”

Section: Determination Of the Twe Velocity By Analytic Geometrical Opmentioning

confidence: 99%

Analytic study of traveling-wave velocity variation in line-focusing schemes for plasma x-ray lasers

et al. 2014

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Efficient amplification of coherent short-wavelength pulses along a plasma gain column requires traveling-wave excitation with the sweep velocity matched to the signal group velocity. Through simulations incorporating the gain dynamics of the system, we show that the group velocity is not constant but increases monotonically along the line focus due to strong saturation. We demonstrate a line-focusing configuration that results in traveling wave excitation with the sweep velocity well matched to the spatially varying group velocity. Moreover, we show through numerical simulations that the improved velocity matching yields a significant improvement in signal amplification.

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“…2, we consider an electron bunch, issued either from a laser wakefield or a conventional linear accelerator, with kinetic energies of several tens of MeV and a normalized emittance ranging from 1 to a few mm mrad. The bunch impinges onto an optical lattice formed by the superposition of two identical laser pulses, synchronized in time and overlapping in space over the path of the electron bunch, in a line focus geometry, using either a homogeneous wave geometry [29,30] or a grazing incidence (GRIP) geometry [31]. In the former case, the two laser pulses are normally incident onto the interaction axis; in the latter, they are incident onto the interaction axis with an angle , usually around 10 .…”

Section: Interaction Parameters In a High Intensity Optical Latticementioning

confidence: 99%

Betatron emission from relativistic electrons in a high intensity optical lattice

Andriyash

d’Humières

Tikhonchuk

et al. 2013

Phys. Rev. ST Accel. Beams

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We describe theoretically and numerically the interaction of a laser-or LINAC-accelerated beam of relativistic electrons with a high intensity optical lattice, resulting from the superposition of two transverse laser pulses. The bunch is trapped and guided within the potential channels of the optical lattice, leading to betatron oscillations. We describe the emission from individual particles and from the bunch, and analyze its spectrum, considering the dominant incoherent radiation as well as possible effects of partial coherency. Analysis of the emitted radiation should provide useful information on the characteristics of the electron beam, and its interaction with the optical lattice.

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Pulse-front control of 15-TW pulses with a tilted compressor, and application to the subpicosecond traveling-wave pumping of a soft-x-ray laser

Cited by 58 publications

References 20 publications

Sub-10-nm wavelength Ni-like-ion collisional x-ray lasers

Sub-10-nm wavelength Ni-like-ion collisional x-ray lasers

Analytic study of traveling-wave velocity variation in line-focusing schemes for plasma x-ray lasers

Betatron emission from relativistic electrons in a high intensity optical lattice

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