Polarization Characterization of Soft X-Ray Radiation at FERMI FEL-2

Roussel, Eléonore; Allaria, E.; Callegari, Carlo; Coreno, Marcello; Cucini, Riccardo; Mitri, S. Di; Diviacco, B.; Finetti, P.; Gauthier, David; Penco, G.; Raimondi, Lorenzo; Svetina, Cristian; Zangrando, Marco; Beckmann, A.; Glaser, Leif; Hartmann, Gregor; Scholz, Frank; Seltmann, Joern; Shevchuk, Ivan; Viefhaus, Jens; Giannessi, L.

doi:10.3390/photonics4020029

Cited by 13 publications

(12 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The FEL and optical pulses were divergent by approximately 10 • , which was exploited to separate the beams and measure the reflected FEL intensity on an AXUV photo-diode (Opto-Diode) with a response time of significantly less than 0.1 s. The photodiode was shielded from the pump pulse and other stray radiation by a 100 nm thick Al foil. Polarization of the FEL has been characterized previously [30].…”

Section: Methodsmentioning

confidence: 99%

Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet

et al. 2020

View full text Add to dashboard Cite

Ultrafast time-resolved extreme ultraviolet (EUV) reflectivity measurements of optically pumped amorphous carbon (a-C) have been performed with the FERMI free electron laser (FEL). This work extends the energy range used in previous reflectivity studies and adds polarization dependence. The EUV probe is known to be sensitive to lattice dynamics, since in this range the reflectivity is essentially unaffected by the photo-excited surface plasma. The exploitation of both s- and p-polarized EUV radiation permits variation of the penetration depth of the probe; a significant increase in the characteristic time is observed upon increasing the probing depth (1 vs. 5 ps) due to hydrodynamic expansion and consequent destruction of the excited region, implying that there is only a short window during which the probed region is in the isochoric regime. A weak wavelength dependence of the reflectivity is found, consistent with previous measurements and implying a maximum electronic temperature of 0.8 eV ± 0.4.

show abstract

Section: Methodsmentioning

confidence: 99%

Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet

et al. 2020

View full text Add to dashboard Cite

show abstract

“…of characterizing the polarization of the radiation on a shotto-shot basis [13,14]. The polarimeter was installed at the back end of FERMI's LDM beamline [25], approximately 50 cm downstream of the nominal LDM endstation focal position.…”

Section: Experimental Setup and Modelmentioning

confidence: 99%

“…The diverging photon beam size at the measurement location was >100 μm in order to prevent higher order effects on the photoionization spectra. For details about the transmission at different wavelengths and for different polarization states, see [13,14]. At 23.8 nm wavelength, the beamline simulated transmission has a 4% difference between LH and LV polarization.…”

Section: Experimental Setup and Modelmentioning

confidence: 99%

See 1 more Smart Citation

Free electron laser polarization control with interfering crossed polarized fields

Roussel

Buck

Callegari

et al. 2019

Phys. Rev. Accel. Beams

Self Cite

View full text Add to dashboard Cite

Free electron lasers emit powerful and coherent radiation in a wide wavelength range extending to hard x-rays. This radiation is also characterized by a high degree of polarization that is generally linear and depends on the undulator properties. The possibility of controlling the polarization state of the radiation is an important option for free electron lasers that is critical for a large class of experiments. Such control can be achieved using variable polarization undulators or alternatively via the crossed polarized undulator scheme. We report the results of an extensive study for the characterization of the crossed-polarized undulator scheme in a number of different configurations. A simple model, based on Gaussian mode beam propagation, is presented and used to reproduce the experimental results obtained at the seeded free electron laser FERMI. A good agreement is found between the model and the experiment allowing us to understand the impact of the wavefront properties of the radiation coming from the consecutive undulators on the output radiation. The model is used not only for characterizing the control of the polarization but also for the control of the transverse mode.

show abstract

“…However, these measurements suffer from extremely low photon flux when compared with those using SR and FEL sources [60]. Among the FEL facilities that are currently in operation, circularly-polarized light can be obtained in the EUV to soft X-ray range at the FERMI@Elettra and Linac Coherent Light Source (LCLS) [61][62][63] facilities. However, to extract the magnetization dynamics, accurate preliminary determination of the degree of circular polarization, which is dependent on the energy, is required.…”

Section: Characteristics Of the Tr-rmoke Techniquementioning

confidence: 99%

Measurement of the Resonant Magneto-Optical Kerr Effect Using a Free Electron Laser

Yamamoto

Matsuda

2017

Applied Sciences

View full text Add to dashboard Cite

We present a new experimental magneto-optical system that uses soft X-rays and describe its extension to time-resolved measurements using a free electron laser (FEL). In measurements of the magneto-optical Kerr effect (MOKE), we tune the photon energy to the material absorption edge and thus induce the resonance effect required for the resonant MOKE (RMOKE). The method has the characteristics of element specificity, large Kerr rotation angle values when compared with the conventional MOKE using visible light, feasibility for M-edge, as well as Ledge measurements for 3d transition metals, the use of the linearly-polarized light and the capability for tracing magnetization dynamics in the subpicosecond timescale by the use of the FEL. The time-resolved (TR)-RMOKE with polarization analysis using FEL is compared with various experimental techniques for tracing magnetization dynamics. The method described here is promising for use in femtomagnetism research and for the development of ultrafast spintronics.

show abstract

Polarization Characterization of Soft X-Ray Radiation at FERMI FEL-2

Cited by 13 publications

References 42 publications

Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet

Free Electron Laser Measurement of Liquid Carbon Reflectivity in the Extreme Ultraviolet

Free electron laser polarization control with interfering crossed polarized fields

Measurement of the Resonant Magneto-Optical Kerr Effect Using a Free Electron Laser

Contact Info

Product

Resources

About