High-gain harmonic-generation free-electron laser seeded by harmonics generated in gas

Abstract : The injection of a seed in a free-electron laser (FEL) amplifier reduces the saturation length and improves the longitudinal coherence. A cascaded FEL, operating in the high-gain harmonic-generation regime, allows us to extend the beneficial effects of the seed to shorter wavelengths. We report on the first operation of a high-gain harmonic-generation free-electron laser, seeded with harmonics generated in gas. The third harmonics of a Ti:sapphire laser, generated in a gas cell, has been amplified and up-converted to its second harmonic (?rad=133nm) in a FEL cascaded configuration based on a variable number of modulators and radiators. We studied the transition between coherent harmonic generation and superradiant regime, optimizing the laser performances with respect to the number of modulators and radiators. © 2011 American Physical Society.
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Submitted on : Friday, March 28, 2014 - 10:39:43 AM
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M. Labat, M. Bellaveglia, M. Bougeard, B. Carré, F. Ciocci, et al.. High-gain harmonic-generation free-electron laser seeded by harmonics generated in gas. Physical Review Letters, American Physical Society, 2011, 107 (22), ⟨10.1103/physrevlett.107.224801⟩. ⟨hal-00964902⟩

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