Nonlinear Compton scattering holds great promise for creating powerful narrow-band sources of high-energy radiation. However, a spectral broadening of the harmonics arises for laser pulses with a realistic envelope due to inhomogeneous light pressure, reducing the source brightness. To effectively use the nonlinear Compton scattering, a rectangular laser pulse shape is more favorable. In this Letter, a pulse-stacking method is studied to obtain a close-to-rectangular envelope and a narrow-band Compton source in the nonlinear regime. The impact of stacking errors in amplitude, phase, and delay on the source brightness is investigated. A method is presented to obtain a multicolor gamma source.

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• Beam code development & simulation techniques
• Classical electromagnetism
• Electromagnetic field calculations
• Methods in electromagnetism
• Laser applications
• Radiation from moving charges
• Synchrotron radiation facilities