Single zeptosecond pulse generation by scattering of a relativistic electron with an intense circularly polarized laser pulse

摘要

The spatial, temporal and spectral emission characteristics of radiation generated from electron oscillations drivenby an intense circularly polarized laser pulse have been investigated theoretically and numerically using a single electronmodel. The motion of an electron is highly relativistic and head-on (180° ) collision of a single counterstreamingelectron and an intense circularly polarized laser pulse can produce a single ultrashort zeptosecond pulse along θ = 90°by merely using a few-cycle laser pulse with fixed carrier-envelope phase offset ϕ_0 = 0without controlling phase in Φ_(in)[5] which is defined as the phase of the laser pulse when the electron enters it. An interesting modulated structure of thespatial characteristic is observed and analyzed.