title: Generation of 9 MeV γ-rays by all-laser-driven Compton scattering with second-harmonic laser light.
abstract: Gamma-ray photons with energy >9  MeV were produced when second-harmonic-generated laser light (3 eV) inverse-Compton-scattered from a counterpropagating relativistic (~450  MeV) laser-wakefield-accelerated electron beam. Two laser pulses from the same laser system were used: one to accelerate electrons and one to scatter. Since the two pulses play very different roles in the γ-ray generation process, and thus have different requirements, a novel laser system was developed. It separately and independently optimized the optical properties of the two pulses. This approach also mitigated the deleterious effects on beam focusing that generally accompany nonlinear optics at high peak-power levels.
authors.forename: Cheng
authors.initials: C
authors.lastname: Liu
authors.forename: Grigory
authors.initials: G
authors.lastname: Golovin
authors.forename: Shouyuan
authors.initials: S
authors.lastname: Chen
authors.forename: Jun
authors.initials: J
authors.lastname: Zhang
authors.forename: Baozhen
authors.initials: B
authors.lastname: Zhao
authors.forename: Daniel
authors.initials: D
authors.lastname: Haden
authors.forename: Sudeep
authors.initials: S
authors.lastname: Banerjee
authors.forename: Jack
authors.initials: J
authors.lastname: Silano
authors.forename: Hugon
authors.initials: H
authors.lastname: Karwowski
authors.forename: Donald
authors.initials: D
authors.lastname: Umstadter