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Nonlinear Compton scattering has been observed in the collision of a low-emittance 46. 6-GeV electron beam with terawatt pulses from a Nd: glass laser at 1054 and 527 nm wavelengths in an experiment at the Final Focus Test Beam at SLAC. Peak laser intensities of 10^180ex{0ex}W/cm^2 have been achieved, corresponding to a value of 0. 6 for the parameter 0ex{0ex}=0ex{0ex}eEₑ₌ₒ/m₀c. Results are presented for multiphoton Compton scattering in which up to four laser photons interact with an electron, in agreement with theoretical calculations.
Bula et al. (Mon,) studied this question.