Relativistic two-photon bremsstrahlung

Korol, Andrey V.; Solovjev, I. A.

doi:10.1016/j.radphyschem.2006.01.001

Cited by 6 publications

(5 citation statements)

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“…In [15,16,17], the simultaneous emission of two photons is interpreted in terms of the Unruh effect. Other two-photon processes that have been investigated, both theoretically and experimentally are double bremsstrahlung [18,19,20], two-photon synchrotron emission [21,22], and the total rate of two-photon emission in a crossed field [23]. However, the generalization to nonperturbative double Compton scattering has not been recorded in the literature to the best of our knowledge.…”

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confidence: 99%

Nonperturbative Treatment of Double Compton Backscattering in Intense Laser Fields

Lötstedt

Jentschura

2009

Phys. Rev. Lett.

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The emission of a pair of entangled photons by an electron in an intense laser field can be described by two-photon transitions of laser-dressed, relativistic Dirac-Volkov states. In the limit of a small laser field intensity, the two-photon transition amplitude approaches the result predicted by double Compton scattering theory. Multi-exchange processes with the laser field, including a large number of exchanged laser photons, cannot be described without the fully relativistic Dirac-Volkov propagator. The nonperturbative treatment significantly alters theoretical predictions for future experiments of this kind. We quantify the degree of polarization correlation of the photons in the final state by employing the well-established concurrence as a measure of the entanglement.PACS numbers: 12.20. Ds, 34.50.Rk, 32.80.Wr, 03.65.Ud, 13.60.Fz Introduction.-In ordinary Compton scattering [1], a photon is scattered inelastically by an electron. For photons with energy much less than the electron's rest mass, the quantum mechanical expression for the cross section agrees with the one obtained by classical electrodynamics. Nonlinear Compton scattering is encountered when several photons from a strong laser beam are scattered by a free electron to produce a photon of different energy; this process has been calculated theoretically [2,3] and successfully measured [4,5]. Recently, there has been an increased interest in a different nonlinear generalization of Compton scattering where a free electron collides with a laser pulse and emits two photons at the same time. This process has no classical counterpart, and indeed, as we will see, the two photons exhibit a paradigmatic quantum feature: namely, their polarizations are entangled. Properly optimized, two-photon emission from backscattering of laser photons at an electron beam holds the promise of providing entangled light at much larger energy than conventionally used for quantum information purposes [6].With relativistically strong lasers being available in many laboratories worldwide, the current record being a laser intensity of 10 22 W/cm 2 at the focus [7], the quest for observing genuine laser-induced quantum effects in the relativistic regime continues. However, the peak field strengths are still orders of magnitudes below the quantum electrodynamic (QED) critical field E c = −m 2 /e = 10 16 V/cm for pair creation (here m and e = −|e| denote the mass and charge of the electron, respectively, and we use natural relativistic units c = = ǫ 0 = 1). Two-photon emission by a laser-dressed electron via nonperturbative double Compton backscattering is a strong-field, relativistic quantum effect which could be observed without the additional complications connected with the ultra-relativistic particle beams necessary for laser-dressed pair creation [8,9,10].The theory of perturbative double Compton scattering, the reaction in which one photon scatters on an electron to produce two final photons was calculated by Mandl and Skyrme [11], recently reexamined in [12], and exper...

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Nonperturbative Treatment of Double Compton Backscattering in Intense Laser Fields

Lötstedt

Jentschura

2009

Phys. Rev. Lett.

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“…However, the first experimental observations of two-photon Bs, carried out in [35,36], demonstrated a significant excess of the measured intensity of two-photon Bs over the value predicted theoretically in [33]. This result stimulated a large number of theoretical studies [37][38][39][40][41][42][43][44][45][46][47] that, however, did not lead to an improvement in the agreement between theory and experiment. The problem was resolved by experimenters as well [48].…”

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confidence: 95%

Two-photon laser-assisted electron scattering on hydrogen atom

Kornev

Zon

2019

J. Phys. B: At. Mol. Opt. Phys.

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We considered the influence of light-dressed-atom effect on two-photon laser-assisted electron-atom scattering in the Born approximation. We performed calculations for the ground state of a Hydrogen atom. We demonstrated that for small scattering angles, the main contribution to the cross section is made by the combined process, when one of the photons is absorbed by the atomic electron and the second one by the scattered electron. However, in the UV region, when two-photon resonances with highly excited atomic states arise, the main contribution to the cross section is determined by the inverse polarization Bremsstrahlung absorption.

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“…Probably the most well known process of this kind is double bremsstrahlung [21,22,23,24,25,26,27,28,29], but also photon pair creation in a magnetic field [30,31,32], and in a crossed field [33] has been considered. The process under investigation in this paper is complementary to those mentioned above, and may provide for better control of the properties of the produced photons by adjusting the laser parameters.…”

Section: Introductionmentioning

confidence: 99%

“…In order to bring the current investigation into perspective, we would like to mention other work performed in connection with two-photon emission from free electrons: indeed, a pair of photons may be produced by electrons accelerated by any kind of external field. Probably the most well known process of this kind is double bremsstrahlung [21,22,23,24,25,26,27,28,29], but also photon pair creation in a magnetic field [30,31,32], and in a crossed field [33] has been considered. The process under investigation in this paper is complementary to those mentioned above, and may provide for better control of the properties of the produced photons by adjusting the laser parameters.…”

Section: Introductionmentioning

confidence: 99%

Correlated two-photon emission by transitions of Dirac-Volkov states in intense laser fields: QED predictions

Lötstedt

Jentschura

2009

Phys. Rev. A

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In an intense laser field, an electron may decay by emitting a pair of photons. The two photons emitted during the process, which can be interpreted as a laser-dressed double Compton scattering, remain entangled in a quantifiable way: namely, the so-called concurrence of the photon polarizations gives a gauge-invariant measure of the correlation of the hard gamma rays. We calculate the differential rate and concurrence for a backscattering setup of the electron and photon beam, employing Volkov states and propagators for the electron lines, thus accounting nonperturbatively for the electron-laser interaction. The nonperturbative results are shown to differ significantly compared to those obtained from the usual double Compton scattering.

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Relativistic two-photon bremsstrahlung

Cited by 6 publications

References 65 publications

Nonperturbative Treatment of Double Compton Backscattering in Intense Laser Fields

Nonperturbative Treatment of Double Compton Backscattering in Intense Laser Fields

Two-photon laser-assisted electron scattering on hydrogen atom

Correlated two-photon emission by transitions of Dirac-Volkov states in intense laser fields: QED predictions

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