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Title: Tunable thin film polarizer for the vacuum ultraviolet and soft x-ray spectral regions

Abstract

A low pass polarizer that suppresses higher-order diffraction light from vacuum ultraviolet and soft x-ray monochromators is presented in this paper. This vacuum ultraviolet and soft x-ray polarizer is based on a concept of sandwiched metal-dielectric-metal triple reflection configuration. By appropriate optimization of material and angle of incidence, the proposed Au-SiC-Au polarizer demonstrates the capability of matching to desired cutoff edge of photon energy. Furthermore, the optimized soft x-ray polarizer shows the possibility to tune cutoff photon energy in a broadband spectral region ranging from 80 down to down to 20 eV.

Authors:
; ;  [1]
  1. Institute for Analytical Sciences (ISAS), Albert Einstein Strasse 9, 12489 Berlin (Germany)
Publication Date:
OSTI Identifier:
20982715
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 101; Journal Issue: 5; Other Information: DOI: 10.1063/1.2710354; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DIELECTRIC MATERIALS; DIFFRACTION; EV RANGE 10-100; GOLD; INCIDENCE ANGLE; MONOCHROMATORS; OPTIMIZATION; PHOTONS; REFLECTION; SILICON CARBIDES; SOFT X RADIATION; THIN FILMS; ULTRAVIOLET RADIATION; VISIBLE RADIATION

Citation Formats

Yang, Minghong, Cobet, Christoph, and Esser, Norbert. Tunable thin film polarizer for the vacuum ultraviolet and soft x-ray spectral regions. United States: N. p., 2007. Web. doi:10.1063/1.2710354.
Yang, Minghong, Cobet, Christoph, & Esser, Norbert. Tunable thin film polarizer for the vacuum ultraviolet and soft x-ray spectral regions. United States. doi:10.1063/1.2710354.
Yang, Minghong, Cobet, Christoph, and Esser, Norbert. Thu . "Tunable thin film polarizer for the vacuum ultraviolet and soft x-ray spectral regions". United States. doi:10.1063/1.2710354.
@article{osti_20982715,
title = {Tunable thin film polarizer for the vacuum ultraviolet and soft x-ray spectral regions},
author = {Yang, Minghong and Cobet, Christoph and Esser, Norbert},
abstractNote = {A low pass polarizer that suppresses higher-order diffraction light from vacuum ultraviolet and soft x-ray monochromators is presented in this paper. This vacuum ultraviolet and soft x-ray polarizer is based on a concept of sandwiched metal-dielectric-metal triple reflection configuration. By appropriate optimization of material and angle of incidence, the proposed Au-SiC-Au polarizer demonstrates the capability of matching to desired cutoff edge of photon energy. Furthermore, the optimized soft x-ray polarizer shows the possibility to tune cutoff photon energy in a broadband spectral region ranging from 80 down to down to 20 eV.},
doi = {10.1063/1.2710354},
journal = {Journal of Applied Physics},
number = 5,
volume = 101,
place = {United States},
year = {Thu Mar 01 00:00:00 EST 2007},
month = {Thu Mar 01 00:00:00 EST 2007}
}
  • No abstract prepared.
  • Undulator radiation, generated by relativistic electrons traversing a periodic magnet structure, can provide a continuously tunable source of very bright and partially coherent radiation in the extreme ultraviolet (EUV), soft X-ray (SXR), and X-ray regions of the electromagnetic spectrum. Typically, 1--10 W are radiated within a 1/N relative spectral bandwidth, where N is of order 100. Monochromators are frequently used to narrow the spectral bandwidth and increase the longitudinal coherence length, albeit with a more than proportionate loss of power. Pinhole spatial filtering is employed to provide spatially coherent radiation at a power level determined by the wavelength, electron beam,more » and undulator parameters. In this paper, experiments are described in which broadly tunable, spatially coherent power is generated at EUV and soft X-ray wavelengths extending from about 3 to 16 nm (80--430-eV photon energies). Spatially coherent power of order 10 {micro}W is achieved in a relative spectral bandwidth of 9 {times} 10{sup {minus}4}, with 1.90-GeV electrons traversing an 8-cm period undulator of 55 periods. This radiation has been used in 13.4-nm interferometric tests that achieve an rms wavefront error (departure from sphericity) of {lambda}{sub euv}/330. These techniques scale in a straightforward manner to shorter soft X-ray wavelengths using 4--5-cm period undulators at 1.90 GeV and to X-ray wavelengths of order 0.1 nm using higher energy (6--8 GeV) electron beams at other facilities.« less
  • Soft x-ray vacuum ultraviolet spectroscopy (10--600 eV) has been used to study relativistic electron beam energy deposition in 6-..mu..m Au foils mounted in two different anode geometries. Experimentally determined thermal electron temperatures of 173 eV and 306 eV are in agreement with calculations assuming electron energy deposition rates of 5 x 10/sup 13/ W/g and 10/sup 14/ W/g for the two geometries. These results are consistent with electrons multipassing through the thin foils several times.
  • XUV spectroscopy utilizing a 1-m grazing incidence spectrograph and photoelectric diodes is used to determine the response of approximately one-proton-range-thick planar targets to an intense beam of hydrogen and carbon ions. Electron temperature, brightness temperature, and total radiated power are then compared with radiation-hydrodynamic calculations to determine the ion-beam energy deposition and incident current density. Incident current densities of 25--35 kA/cm/sup 2/ with 80% proton current and 20% singly ionized carbon ion current are consistent with the spectroscopic measurements.