Optical Klystron Enhancement to Self Ampliﬁed Spontaneous Emission at FERMI

Penco, G.; Allaria, E.; Ninno, G. De; Giannessi, L.; Roussel, Eléonore; Spampinati, S.

doi:10.3390/photonics4010015

Cited by 14 publications

(8 citation statements)

References 41 publications

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“…This feature of FERMI allowed us to analyse simultaneously the spectral profile of each pulse delivered and measured at the DiProI end-station. One more important feature of FERMI is that its operation can be switched from seeded to SASE mode [24].…”

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confidence: 99%

Seeded X-ray free-electron laser generating radiation with laser statistical properties

et al. 2018

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The invention of optical lasers led to a revolution in the field of optics and to the creation of such fields of research as quantum optics. The reason was their unique statistical and coherence properties. The emerging, short-wavelength free-electron lasers (FELs) are sources of very bright coherent extreme-ultraviolet and X-ray radiation with pulse durations on the order of femtoseconds, and are presently considered to be laser sources at these energies. FELs are highly spatially coherent to the first-order but in spite of their name, behave statistically as chaotic sources. Here, we demonstrate experimentally, by combining Hanbury Brown and Twiss interferometry with spectral measurements that the seeded XUV FERMI FEL-2 source does indeed behave statistically as a laser. The results may be useful for quantum optics experiments and for the design and operation of next generation FEL sources.

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Seeded X-ray free-electron laser generating radiation with laser statistical properties

et al. 2018

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“…It was originally introduced for gain control in oscillator FELs [58], but its application has been expanded. It has been used as a method to speed up the FEL process in SASE operation, when the total amplifier length is not sufficient for a given wavelength [59][60][61]. In addition, it is used in a seeding scheme when the seed laser peak power is not sufficient to increase the energy modulation required in seeding [17].…”

Section: Optical Klystronmentioning

confidence: 99%

Advanced Scheme to Generate MHz, Fully Coherent FEL Pulses at nm Wavelength

et al. 2021

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Current FEL development efforts aim at improving the control of coherence at high repetition rate while keeping the wavelength tunability. Seeding schemes, like HGHG and EEHG, allow for the generation of fully coherent FEL pulses, but the powerful external seed laser required limits the repetition rate that can be achieved. In turn, this impacts the average brightness and the amount of statistics that experiments can do. In order to solve this issue, here we take a unique approach and discuss the use of one or more optical cavities to seed the electron bunches accelerated in a superconducting linac to modulate their energy. Like standard seeding schemes, the cavity is followed by a dispersive section, which manipulates the longitudinal phase space of the electron bunches, inducing longitudinal density modulations with high harmonic content that undergo the FEL process in an amplifier placed downstream. We will discuss technical requirements for implementing these setups and their operation range based on numerical simulations.

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“…FEL-1 and FEL-2 may be operated even without the presence of an external seed, i.e., in SASE mode. The emission may be indeed enhanced by tuning the dispersive section of FEL-1 [20] or the multiple dispersion sections of FEL-2 [21], to increase the electron bunching at entrance of the final amplifier. In this configuration, the light pulse resembles the longitudinal structure of the beam current, with a correlation length much shorter than the electron bunch length.…”

Section: Longitudinal Coherence and Pulse Durationmentioning

confidence: 99%

FERMI: Present and Future Challenges

Giannessi

Masciovecchio

2017

Applied Sciences

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We present an overview of the FERMI (acronym of Free Electron laser Radiation for Multidisciplinary Investigations) seeded free electron laser (FEL) facility located at the Elettra laboratory in Trieste. FERMI is now in user operation with both the FEL lines FEL-1 and FEL-2, covering the wavelength range between 100 nm and 4 nm. The seeding scheme adopted for photon pulse production makes FERMI unique worldwide and allows the extension of table top laser experiments in the extreme ultraviolet/soft X-ray region. In this paper, we discuss how advances in the performance of the FELs, with respect to coherent control and multi-colour pulse production, may push the development of original experimental strategies to study non-equilibrium behaviour of matter at the attosecond-nanometer time-length scales. This will have a tremendous impact as an experimental tool to investigate a large array of phenomena ranging from nano-dynamics in complex materials to phenomena that are at the heart of the conversion of light into other forms of energy.

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Optical Klystron Enhancement to Self Ampliﬁed Spontaneous Emission at FERMI

Cited by 14 publications

References 41 publications

Seeded X-ray free-electron laser generating radiation with laser statistical properties

Seeded X-ray free-electron laser generating radiation with laser statistical properties

Advanced Scheme to Generate MHz, Fully Coherent FEL Pulses at nm Wavelength

FERMI: Present and Future Challenges

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