Vacuum ultraviolet circularly polarized coherent femtosecond pulses from laser seeded relativistic electrons

Cutic, Nino; Lindau, Filip; Thorin, Sara; Werin, Sverker; Bahrdt, J.; Eberhardt, W.; Holldack, K.; Erny, Christian; L’Huillier, Anne; Mansten, Erik

doi:10.1103/physrevstab.14.030706

Cited by 27 publications

(8 citation statements)

References 18 publications

(27 reference statements)

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“…At each measured wavelength, all the experimental diagnostics confirm that, as expected from standard single-particle emission theory [39], FERMI's output polarization state may be controlled and adjusted directly via the undulator polarization. Our findings are in accordance with earlier polarization measurements made on visible and UV FEL light, both for a storagering FEL [40] and for low-gain, single-pass seeded FELs [27,[41][42][43] where a very high degree of polarization was found both at the resonant FEL wavelength and at the higher harmonics [42]. They also agree with a recent FERMI user experiment [35] that provided independent evidence at a single VUV wavelength (25.6 nm) of a similar high degree of polarization for the output light of FERMI's FEL-1.…”

Section: Introductionsupporting

confidence: 93%

Control of the Polarization of a Vacuum-Ultraviolet, High-Gain, Free-Electron Laser

Allaria¹,

Diviacco²,

Callegari³

et al. 2014

Phys. Rev. X

113

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International audienceThe two single-pass, externally seeded free-electron lasers (FELs) of the FERMI user facility are designed around Apple-II-type undulators that can operate at arbitrary polarization in the vacuum ultraviolet-to-soft x-ray spectral range. Furthermore, within each FEL tuning range, any output wavelength and polarization can be set in less than a minute of routine operations. We report the first demonstration of the full output polarization capabilities of FERMI FEL-1 in a campaign of experiments where the wavelength and nominal polarization are set to a series of representative values, and the polarization of the emitted intense pulses is thoroughly characterized by three independent instruments and methods, expressly developed for the task. The measured radiation polarization is consistently >90% and is not significantly spoiled by the transport optics; differing, relative transport losses for horizontal and vertical polarization become more prominent at longer wavelengths and lead to a non-negligible ellipticity for an originally circularly polarized state. The results from the different polarimeter setups validate each other, allow a cross-calibration of the instruments, and constitute a benchmark for user experiments

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Section: Introductionsupporting

confidence: 93%

Control of the Polarization of a Vacuum-Ultraviolet, High-Gain, Free-Electron Laser

Allaria¹,

Diviacco²,

Callegari³

et al. 2014

Phys. Rev. X

113

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show abstract

“…Proposed in ref. 15, and demonstrated for low (≤5) harmonics on FELs based on linear accelerators [16][17][18][19][20] and storage rings 21,22 , this technique has been used to design and realize FERMI 23 , the first user facility based on HGHG. In this Article, we present a characterization of the light produced by the FERMI FEL-1.…”

mentioning

confidence: 99%

Highly coherent and stable pulses from the FERMI seeded free-electron laser in the extreme ultraviolet

Allaria¹,

Appio

Badano³

et al. 2012

Nature Photon

927

585

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Free-electron lasers (FELs) are promising devices for generating light with laser-like properties in the extreme ultraviolet and X-ray spectral regions. Recently, FELs based on the self-amplified spontaneous emission (SASE) mechanism have allowed major breakthroughs in diffraction and spectroscopy applications, despite the relatively large shot-to-shot intensity and photon-energy fluctuations and the limited longitudinal coherence inherent in the SASE mechanism. Here, we report results on the initial performance of the FERMI seeded FEL, based on the high-gain harmonic generation configuration, in which an external laser is used to initiate the emission process. Emission from the FERMI FEL-1 source occurs in the form of pulses carrying energy of several tens of microjoules per pulse and tunable throughout the 65 to 20 nm wavelength range, with unprecedented shot-to-shot wavelength stability, low-intensity fluctuations, close to transform-limited bandwidth, transverse and longitudinal coherence and full control of polarization

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“…The use of harmonic generation to produce FEL pulses at short wavelength starting from an external seed laser at long wavelength was originally proposed in [7] and was then applied to high gain single pass FELs to generate IR [8] and VUV coherent emission [9]. In the past decade, HGHG has been demonstrated and studied in several FEL test facilities [10][11][12][13][14][15] down to the VUV spectral range. More recently, HGHG has been demonstrated to efficiently work down to the extreme ultraviolet [4].…”

Section: Introductionmentioning

confidence: 99%

Impact of radiator length in the emitted power for a high gain harmonic generation free-electron laser

Allaria

2013

Phys. Rev. ST Accel. Beams

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We present a numerical study that characterizes the dependence on the radiator length of the output power produced by a free-electron laser (FEL) operated in the high gain harmonic generation (HGHG) configuration. Using the main parameters of the FERMI@Elettra FEL, numerical simulations of the FEL process have been performed for different lengths of the radiator. Our results show that in the case of HGHG the achievable output power has a dependence on the radiator length that is linear. The impact of the electron beam parameters on the achievable maximum power vs radiator length dependence is also studied. A normalization of the results to the FEL saturation power and to the FEL gain length shows that this dependence can be expressed by a universal linear equation that, in some conditions, is independent on the electron beam current and brightness. The reported results could be useful for the design of future FELs based on the HGHG scheme and could be used for a quick estimate of the best undulator length.

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Vacuum ultraviolet circularly polarized coherent femtosecond pulses from laser seeded relativistic electrons

Cited by 27 publications

References 18 publications

Control of the Polarization of a Vacuum-Ultraviolet, High-Gain, Free-Electron Laser

Control of the Polarization of a Vacuum-Ultraviolet, High-Gain, Free-Electron Laser

Highly coherent and stable pulses from the FERMI seeded free-electron laser in the extreme ultraviolet

Impact of radiator length in the emitted power for a high gain harmonic generation free-electron laser

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