2015
DOI: 10.1103/physrevlett.115.194802
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Multi-MeV Electron Acceleration by Subterawatt Laser Pulses

Abstract: We demonstrate laser-plasma acceleration of high charge electron beams to the ~10 MeV scale using ultrashort laser pulses with as little energy as 10 mJ. This result is made possible by an extremely dense and thin hydrogen gas jet. Total charge up to ~0.5 nC is measured for energies >1 MeV. Acceleration is correlated to the presence of a relativistically self-focused laser filament accompanied by an intense coherent broadband light flash, associated with wavebreaking, which can radiate more than ~3% of the las… Show more

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Cited by 90 publications
(60 citation statements)
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“…Collapse is arrested by plasma blowout-where electrons are expelled by the pulse to form a highly nonlinear plasma wake-and subsequent injection of background electrons into the wakefield can accelerate them to relativistic energies. Laser plasma acceleration experiments relying on self-focusing have usually required large, multiterawatt lasers.Recently we demonstrated that very high density, cryogenically cooled gas jets enable near-critical density laser-plasma interaction for Ti:Sapphire lasers at λ=0.8µm, lowering the threshold for relativistic self-focusing and allowing sub-terawatt pulses to drive highly nonlinear plasma waves in the self-modulated laser wakefield (SM-LWFA) regime [11,12]. In this Letter we demonstrate, for the first time, laser wakefield acceleration using femtosecond mid-IR laser pulses (λ=3.9µm).…”
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confidence: 99%
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“…Collapse is arrested by plasma blowout-where electrons are expelled by the pulse to form a highly nonlinear plasma wake-and subsequent injection of background electrons into the wakefield can accelerate them to relativistic energies. Laser plasma acceleration experiments relying on self-focusing have usually required large, multiterawatt lasers.Recently we demonstrated that very high density, cryogenically cooled gas jets enable near-critical density laser-plasma interaction for Ti:Sapphire lasers at λ=0.8µm, lowering the threshold for relativistic self-focusing and allowing sub-terawatt pulses to drive highly nonlinear plasma waves in the self-modulated laser wakefield (SM-LWFA) regime [11,12]. In this Letter we demonstrate, for the first time, laser wakefield acceleration using femtosecond mid-IR laser pulses (λ=3.9µm).…”
mentioning
confidence: 99%
“…Recently we demonstrated that very high density, cryogenically cooled gas jets enable near-critical density laser-plasma interaction for Ti:Sapphire lasers at λ=0.8µm, lowering the threshold for relativistic self-focusing and allowing sub-terawatt pulses to drive highly nonlinear plasma waves in the self-modulated laser wakefield (SM-LWFA) regime [11,12]. In this Letter we demonstrate, for the first time, laser wakefield acceleration using femtosecond mid-IR laser pulses (λ=3.9µm).…”
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confidence: 99%
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“…Next to the investigation of fundamental aspects of relativistic laser and electron dynamics, dense electron bunches with an ultrashort time structure and relativistic γ-factors up to the order of thousand are the basis of brilliant, coherent short wavelength light sources [4, 9 -12] and are suitable for ultra-fast electron diffraction [13]. This prerequisite can be met if an intense and linearly polarized laser pulse interacts with a solid and leads to the emission of electron bunches within a half cycle of an optical laser field.…”
mentioning
confidence: 99%
“…Finally, another way to decrease τ streak is to increase the electron energy E while keeping the resolution of the magnetic spectrometer the same. This may become possible in the near future with recent results showing that multi-MeV electrons can be generated3940.…”
Section: Discussionmentioning
confidence: 99%