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 (lambda(rad) 133 nm) in a FEL cascaded configuration based on a variable number of modulators and radiators. We studied the transition between coherent harmonic generation and super-radiant regime, optimizing the laser performances with respect to the number of modulators and radiators.

High-Gain Harmonic-Generation Free-Electron Laser Seeded by Harmonics Generated in Gas / M., L., M., B., M., B., B., C., F., C., E., C., A., C., M. e., C., L., C., M., D.F., G., D.P., A., D., M., F., D., F., F., F., A., G., D., G., G., G., L., G., G., L., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 107:22(2011), pp. 224801-1-224801-5. [10.1103/physrevlett.107.224801]

High-Gain Harmonic-Generation Free-Electron Laser Seeded by Harmonics Generated in Gas

E. Chiadroni;MOSTACCI, Andrea;
2011

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 (lambda(rad) 133 nm) in a FEL cascaded configuration based on a variable number of modulators and radiators. We studied the transition between coherent harmonic generation and super-radiant regime, optimizing the laser performances with respect to the number of modulators and radiators.
2011
01 Pubblicazione su rivista::01a Articolo in rivista
High-Gain Harmonic-Generation Free-Electron Laser Seeded by Harmonics Generated in Gas / M., L., M., B., M., B., B., C., F., C., E., C., A., C., M. e., C., L., C., M., D.F., G., D.P., A., D., M., F., D., F., F., F., A., G., D., G., G., G., L., G., G., L., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 107:22(2011), pp. 224801-1-224801-5. [10.1103/physrevlett.107.224801]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/464257
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