Pulse-stacking technique for nonlinear Compton scattering: Compensation of nonlinear broadening and generation of multicolor gamma sources

The authors propose a pulse-stacking technique to generate near-rectangular high-intensity laser pulse envelopes, enhancing spectral brightness and narrowing linewidths, which is crucial for high-quality gamma-ray sources. The study includes a noise tolerance analysis and introduces a multicolor emission method with applications in advanced spectroscopy.