Adaptive-feedback spectral-phase control for interactions with transform-limited ultrashort high-power laser pulses

Liu, Cheng; Zhang, Jun; Chen, Shouyuan; Golovin, Grigory; Banerjee, Sudeep; Zhao, Baozhen; Powers, Nathan; Ghebregziabher, Isaac; Umstadter, Donald

doi:10.1364/ol.39.000080

Cited by 26 publications

(16 citation statements)

References 18 publications

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“…The use of lower power stretched pulses also reduces the risk of optical damage arising from SPM-induced inhomogeneity in the scattering beam line, and enables the use of high energy in the 400 nm beam to obtain the highest flux of γ-ray photons.The electron beams were generated via ionization injection [10,11] and subsequent LWFA in the gas-jet target. After compression to 35 fs duration [12], the drive laser pulses, with 2 J energy, were focused by a 1 m off-axis parabola to a 20-μm (FWHM) focal spot, with 40% energy enclosed in the FWHM contour. The focus was located on the rising edge of a 4-mm-long supersonic gas target (99% helium and 1% nitrogen) at a height of 1 mm above the nozzle.…”

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confidence: 99%

Generation of 9 MeV γ-rays by all-laser-driven Compton scattering with second-harmonic laser light

et al. 2014

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Gamma-ray photons with energy >9 MeV were produced when second-harmonic-generated laser light (3 eV) inverse-Compton-scattered from a counterpropagating relativistic (~450 MeV) laser-wakefield-accelerated electron beam. Two laser pulses from the same laser system were used: one to accelerate electrons and one to scatter. Since the two pulses play very different roles in the γ-ray generation process, and thus have different requirements, a novel laser system was developed. It separately and independently optimized the optical properties of the two pulses. This approach also mitigated the deleterious effects on beam focusing that generally accompany nonlinear optics at high peak-power levels.

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confidence: 99%

Generation of 9 MeV γ-rays by all-laser-driven Compton scattering with second-harmonic laser light

et al. 2014

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“…A closed-loop technique for temporal phase correction [32] was used to achieve a Fourier-limited pulse duration. Laser pulses were focused by an f/14 off-axis parabola (1 m focal length) to a 20-um diameter focal spot (FWHM) with 30% of the energy contained within the FWHM contour.…”

Section: Methodsmentioning

confidence: 99%

Control and optimization of a staged laser-wakefield accelerator

Golovin

Banerjee

Chen

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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We report results of an experimental study of laser-wakefield acceleration of electrons, using a staged device based on a double-jet gas target that enables independent injection and acceleration stages. This novel scheme is shown to produce stable, quasi-monoenergetic, and tunable electron beams. We show that optimal accelerator performance is achieved by systematic variation of five critical parameters. For the injection stage, we show that the amount of trapped charge is controlled by the gas density, composition, and laser power. For the acceleration stage, the gas density and the length of the jet are found to determine the final electron energy. This independent control over both the injection and acceleration processes enabled independent control over the charge and energy of the accelerated electron beam while preserving the quasi-monoenergetic character of the beam. We show that the charge and energy can be varied in the ranges of 2-45 pC, and 50-450 MeV, respectively. This robust and versatile electron accelerator will find application in the generation of high-brightness and controllable x-rays, and as the injector stage for more conventional devices.

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“…This approach enables measurements to be done at lower power without altering the properties of the high-power beam. The attenuated pulse at 800 nm is compressed to 34 fs using a grating pulse compressor [16]. A bimorph deformable mirror (NightN) located after the compressor is used to correct the distortions in the laser pulse.…”

Section: Methodsmentioning

confidence: 99%

Wavefront-correction for nearly diffraction-limited focusing of dual-color laser beams to high intensities

Zhao¹,

Zhang²,

Chen³

et al. 2014

Opt. Express

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Adaptive-feedback spectral-phase control for interactions with transform-limited ultrashort high-power laser pulses

Cited by 26 publications

References 18 publications

Generation of 9 MeV γ-rays by all-laser-driven Compton scattering with second-harmonic laser light

Generation of 9 MeV γ-rays by all-laser-driven Compton scattering with second-harmonic laser light

Control and optimization of a staged laser-wakefield accelerator

Wavefront-correction for nearly diffraction-limited focusing of dual-color laser beams to high intensities

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