Coherent combs of antimatter from nonlinear electron-positron-pair creation

Krajewska, K.; Kamiński, J. Z.

doi:10.1103/physreva.90.052108

Cited by 33 publications

(36 citation statements)

References 43 publications

(61 reference statements)

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“…In particular, the carrier-envelope phase of a few-cycle pulse was shown to exert a characteristic impact [17,18]. Besides, when several laser pulses follow each other, their partial contributions add up coherently, leading to a comb-like structure of emitted positrons [19]. In certain laser parameter domains, the spectral broadness of a short pulse may also strongly affect the total pair creation probability due to subthreshold enhancement effects [20,21].…”

Section: Introductionmentioning

confidence: 99%

Strong-field Breit–Wheeler pair production in two consecutive laser pulses with variable time delay

Jansen

Müller

2017

Physics Letters B

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Photoproduction of electron-positron pairs by the strong-field Breit-Wheeler process in an intense laser field is studied. The laser field is assumed to consist of two consecutive short pulses, with a variable time delay in between. By numerical calculations within the framework of scalar quantum electrodynamics, we demonstrate that the time delay exerts a strong impact on the pair-creation probability. For the case when both pulses are identical, the effect is traced back to the relative quantum phase of the interfering S -matrix amplitudes and explained within a simplified analytical model. Conversely, when the two laser pulses differ from each other, the pair-creation probability depends not only on the time delay but, in general, also on the temporal order of the pulses.Keywords: Electron-positron pair production, short laser pulses, quantum interference 2010 MSC: 00-01, 99-00 D ⊢ ⊢ Figure 1: Scheme of the field configuration: The gamma quantum (blue) collides with two consecutive short laser pulses (red) with a variable distance D.

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Section: Introductionmentioning

confidence: 99%

Strong-field Breit–Wheeler pair production in two consecutive laser pulses with variable time delay

Jansen

Müller

2017

Physics Letters B

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“…In particular, such diverse phenomena have been studied as the vacuum polarization induced Young interference [25], the Kapitza-Dirac effect [26,27], interference effects in Compton and Thomson scattering (see, e.g., [28,29]), and in lasermodified Mott scattering [30,31], the coherent comb structures created by a finite train of short pulses in the Compton [32,33], Breit-Wheeler [34], and ionization [35] processes, which can be used for the diagnostics of relativistically intense laser pulses [36,37].…”

Section: Introductionmentioning

confidence: 99%

Supercontinuum in ionization by relativistically intense and short laser pulses: Ionization without interference and its time analysis

Krajewska

Kamiński

2016

Phys. Rev. A

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Ionization by relativistically intense laser pulses of finite duration is considered in the framework of strongfield quantum electrodynamics. We show that the resulting ionization spectra change their behavior from the interference-dominated oscillatory pattern to the interference-free smooth supercontinuum, the latter being the main focus of this paper. More specifically, when studying the energy distributions of photoelectrons ionized by circularly polarized and short pulses, we observe the appearance of broad structures lacking the interference patterns. These supercontinua extend over hundreds of driving photon energies, thus corresponding to high-order nonlinear processes. Their positions on the electron energy scale can be controlled by changing the pulse duration. The corresponding polar-angle distributions show asymmetries which are attributed to the radiation pressure experienced by photoelectrons. Moreover, our time analysis shows that the electrons comprising the supercontinuum can form pulses of short duration. While we present the fully numerical results, their interpretation is based on the saddle-point approximation for the ionization probability amplitude.

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“…The on-beam-axis radiation for such electrons (i) has lower photon energy in accordance with Eq. (36) and is taken into account in Eq. (39); and (ii) possesses additional broadening due to the non perfect compensation.…”

Section: Effects Of Electron Beam Energy Spread and Emittancementioning

confidence: 99%

“…Other aspects of nonlinear Compton scattering in short laser pulses that affect inverse Compton x-ray sources include the prospects for the generation of x-ray frequency combs [51,52], asymmetries in the angular distributions [53,54], spin- [35,36,55,56] and higher-order QED effects [57][58][59][60][61]. Moreover, using vortex beams that carry orbital angular momentum in a Compton backscattering set-up allows to generate high-energy vortex beams [62] or to control the spatial distribution of the generated x-rays [63].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…* d.seipt@gsi.de These proposals for compensating the ponderomotive broadening were just based on the classical theory of Thomson scattering that neglects the electron recoil [30,32]. However, there are well-known differences between the spectra of Thomson scattering and Compton scattering due to electron recoil and spin effects [33][34][35][36]. It is, therefore, important to study whether a full compensation of the ponderomotive broadening is still possible when these effects are taken into account.…”

Section: Introductionmentioning

confidence: 99%

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Narrowband inverse Compton scattering x-ray sources at high laser intensities

et al. 2015

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Narrowband x-and gamma-ray sources based on the inverse Compton scattering of laser pulses suffer from a limitation of the allowed laser intensity due to the onset of nonlinear effects that increase their bandwidth. It has been suggested that laser pulses with a suitable frequency modulation could compensate this ponderomotive broadening and reduce the bandwidth of the spectral lines, which would allow to operate narrowband Compton sources in the high-intensity regime. In this paper we, therefore, present the theory of nonlinear Compton scattering in a frequency modulated intense laser pulse. We systematically derive the optimal frequency modulation of the laser pulse from the scattering matrix element of nonlinear Compton scattering, taking into account the electron spin and recoil. We show that, for some particular scattering angle, an optimized frequency modulation completely cancels the ponderomotive broadening for all harmonics of the backscattered light. We also explore how sensitive this compensation depends on the electron beam energy spread and emittance, as well as the laser focusing.

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Coherent combs of antimatter from nonlinear electron-positron-pair creation

Cited by 33 publications

References 43 publications

Strong-field Breit–Wheeler pair production in two consecutive laser pulses with variable time delay

Strong-field Breit–Wheeler pair production in two consecutive laser pulses with variable time delay

Supercontinuum in ionization by relativistically intense and short laser pulses: Ionization without interference and its time analysis

Narrowband inverse Compton scattering x-ray sources at high laser intensities

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