Abstract
An ABCD formalism is identified to characterize a seeded Free Electron Laser (FEL) with three chirps: an initial frequency chirp in the seed Laser, an energy chirp in the electron bunch, and an intrinsic frequency chirp due to the FEL process. A scheme of generating attosecond few-cycle pulses is proposed by invoking an FEL seeded by high-order harmonic generation (HHG) from an infrared laser. The HHG seed has generic attosecond structure. It is possible to manipulate these three chirps to maintain the attosecond structure via post-undulator chirped pulse compression.
Highlights
A scheme of generating attosecond few-cycle pulses is proposed by invoking an Free Electron Laser (FEL) seeded by high-order harmonic generation (HHG) from an infrared laser
We propose an FEL scheme that is seeded by high-order harmonic generation (HHG) driven by an ir laser [5, 6], in which three chirps are manipulated in the HHG seeded FEL [7]
We identify an ABCD formalism [8, 9, 10] to characterize the interplay of the chirps and the evolution of the temporal duration, the spectral bandwidth, and the chirp of the FEL pulse
Summary
ABCD formalism and attosecond few-cycle pulse via chirp manipulation of a seeded free electron laser The energy chirp in the electron bunch is the key to maintain a large bandwidth in the FEL pulse, so that an effective chirped pulse compression after the undulator is possible to generate an attosecond pulse train.
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