Interplay of the chirps and chirped pulse compression in a high-gain seeded free-electron laser

Journal Article · Thu Mar 15 04:00:00 EDT 2007 · Journal of the Optical Society of America. Part B, Optical Physics

DOI:https://doi.org/10.1364/JOSAB.24.000484· OSTI ID:20929626

Juhao, Wu; Murphy, James B; Emma, Paul J; Xijie, Wang; Watanabe, Takahiro; Xinming, Zhong ^[1]

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1. Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309 (United States)

In a seeded high-gain free-electron laser (FEL), where a coherent laser pulse interacts with an ultrarelativistic electron beam, the seed laser pulse can be frequency chirped, and the electron beam can be energy chirped. Besides these two chirps, the FEL interaction introduces an intrinsic frequency chirp in the FEL even if the above-mentioned two chirps are absent. We examine the interplay of these three chirps. The problem is formulated as an initial value problem and solved via a Green function approach. Besides the chirp evolution, we also give analytical expressions for the pulse duration and bandwidth of the FEL, which remains fully longitudinally coherent in the high-gain exponential growth regime. Because the chirps are normally introduced for a final compression of the FEL pulse, some conceptual issues are discussed. We show that to get a short pulse duration, an energy chirp in the electron beam is important.

• OSTI ID: 20929626
• Journal Information: Journal of the Optical Society of America. Part B, Optical Physics, Journal Name: Journal of the Optical Society of America. Part B, Optical Physics Journal Issue: 3 Vol. 24; ISSN JOBPDE; ISSN 0740-3224
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTRON BEAMS
EVOLUTION
FREE ELECTRON LASERS
GREEN FUNCTION
MODULATION
PULSES
RELATIVISTIC RANGE