Two-photon bremsstrahlung processes in atoms: Polarization effects and analytic results for the Coulomb potential

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

“…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.…”

“…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.…”

Relativistic two-photon bremsstrahlung

“…Within the framework of the non-relativistic dipole-photon approximation it was demonstrated that for the correct evaluation of (1) it is necessary to take into account all singular terms of the free-free matrix elements, and in many cases the contribution of the delta-terms to the integral on the right-hand side is highly noticeable, if not dominant. Such an analysis has been carried out in connection with many-photon ionization (detachment) [18][19][20][21], the single-photon bremsstrahlung process with simultaneous ionization of the target [22], the process of two-photon bremsstrahlung [23,24], and the process of spontaneous bremsstrahlung in presence of a laser field [25]. In nonrelativistic non-dipole approximation the analogous treatment has been applied so far to the free-free compound matrix element which characterizes the amplitude of twophoton bremsstrahlung [3,4].…”

Triple Compton Effect: A Photon Splitting into Three upon Collision with a Free Electron

“…On the other hand, the double Compton effect is rather well studied, both experimentally [15][16][17][18] and theoretically [2,19,20]. In addition, several other processes have been studied where two photons are produced in the final state, such as double bremsstrahlung [21][22][23], bound state decay [24,25], and laser-induced photon splitting [26], but comparatively little is known about triple photon production.…”