Development and performance test of a soft x-ray polarimeter and ellipsometer for complete polarization analysis

A new soft X-ray beamline, BL07LSU, has been constructed at SPring-8 to perform advanced soft X-ray spectroscopy for materials science. The beamline is designed to achieve high energy resolution (E/ÁE> 10000) and high photon flux [>10 12 photons s À1 (0.01% bandwidth) À1 ] in the photon energy range 250-2000 eV with controllable polarization. To realise this state-of-the-art performance, a novel segmented cross undulator was developed and adopted as a light source. The details of the undulator light source and beamline monochromator design are described. The achieved performance of the beamline, such as the photon flux, energy resolution and the state of polarization, is reported.

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“…method, I(), follows the modified Malus's law expressed as follows (Kimura et al, 1993;Hecht, 2002;Imazono et al, 2009),…”

Section: Figurementioning

confidence: 99%

New soft X-ray beamline BL07LSU at SPring-8

Yamamoto

Senba

Tanaka

et al. 2014

J Synchrotron Radiat

118

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“…Therefore, a complete polarization analysis is usually performed at synchrotrons with sophisticated polarimetric and ellipsometric instruments. [9][10][11] In a small-scale laboratory, various EUV and soft X-ray light sources are available, but only few of them are a priori polarized. While linearly polarized EUV light is routinely generated by intense ultrashort laser pulses, 12 only few attempts to either polarize EUV radiation circularly 13,14 or directly generate circular EUV radiation from a femtosecond laser 15 have been reported from laboratory-based experiments.…”

Section: Introductionmentioning

confidence: 99%

Generation of circularly polarized radiation from a compact plasma-based extreme ultraviolet light source for tabletop X-ray magnetic circular dichroism studies

Wilson

Rudolf

Weier

et al. 2014

Review of Scientific Instruments

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Generation of circularly polarized light in the extreme ultraviolet (EUV) spectral region (about 25 eV–250 eV) is highly desirable for applications in spectroscopy and microscopy but very challenging to achieve in a small-scale laboratory. We present a compact apparatus for generation of linearly and circularly polarized EUV radiation from a gas-discharge plasma light source between 50 eV and 70 eV photon energy. In this spectral range, the 3p absorption edges of Fe (54 eV), Co (60 eV), and Ni (67 eV) offer a high magnetic contrast often employed for magneto-optical and electron spectroscopy as well as for magnetic imaging. We simulated and designed an instrument for generation of linearly and circularly polarized EUV radiation and performed polarimetric measurements of the degree of linear and circular polarization. Furthermore, we demonstrate first measurements of the X-ray magnetic circular dichroism at the Co 3p absorption edge with a plasma-based EUV light source. Our approach opens the door for laboratory-based, element-selective spectroscopy of magnetic materials and spectro-microscopy of ferromagnetic domains

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“…Measurements by the manufacturer at several wavelengths are in good agreement with the calculations, figure 3(b). The diffraction efficiencies at the incidence angles and diffraction orders used in these experiments have been measured using synchrotron radiation [63,64]; comparison of the harmonic spectra obtained from the second and third diffraction orders (see later, in figure 6(c)), suggests that the diffraction efficiencies are valid with a relative accuracy of better than several percent. Quantum efficiency data and gain are provided by the CCD manufacturers.…”

Section: Methodsmentioning

confidence: 99%

High order harmonics from relativistic electron spikes

Pirozhkov¹,

Kando²,

Esirkepov³

et al. 2014

New J. Phys.

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A new regime of relativistic high-order harmonic generation has been discovered (Pirozhkov 2012 Phys. Rev. Lett. 108 135004). Multi-terawatt relativistic-irradiance (>10 18 W cm −2 ) femtosecond (∼30-50 fs) lasers focused to underdense (few × 10 19 cm −3 ) plasma formed in gas jet targets produce comb-like spectra with hundreds of even and odd harmonic orders reaching the photon energy of 360 eV, including the 'water window' spectral range. Harmonics are generated either by linearly or circularly polarized pulses from the J-KAREN (KPSI, JAEA) and Astra Gemini (CLF, RAL, UK) lasers. The photon number scalability has been demonstrated with a 120 TW laser, producing 40 μJ sr −1 per harmonic at 120 eV. The experimental results are explained using particle-in-cell simulations and catastrophe theory. A new mechanism of harmonic generation by sharp, structurally stable, oscillating electron spikes at the joint of the boundaries of the wake and bow waves excited by a laser pulse is introduced. In this paper, detailed descriptions of the experiments, simulations and model are provided and new features are shown, including data obtained with a twochannel spectrograph, harmonic generation by circularly polarized laser pulses and angular distribution. S Online supplementary data available from stacks.iop.org/NJP/16/093003/ mmedia Keywords: relativistic laser plasma, high-order harmonics, relativistic electron spikes, gas jet target Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. 2 New J. Phys. 16 (2014) 093003 A S Pirozhkov et al

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Development and performance test of a soft x-ray polarimeter and ellipsometer for complete polarization analysis

Cited by 16 publications

References 24 publications

New soft X-ray beamline BL07LSU at SPring-8

New soft X-ray beamline BL07LSU at SPring-8

Generation of circularly polarized radiation from a compact plasma-based extreme ultraviolet light source for tabletop X-ray magnetic circular dichroism studies

High order harmonics from relativistic electron spikes

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