Single-channel method for measuring the reflectance spectra of grazing incidence mirrors in the extreme ultraviolet range

2019 ◽  
Vol 44 (20) ◽  
pp. 4949
Author(s):  
D. B. Abramenko ◽  
P. S. Antsiferov ◽  
L. A. Dorokhin ◽  
V. V. Medvedev ◽  
Yu. V. Sidelnikov ◽  
...  
Keyword(s):  
Single Channel ◽  
Extreme Ultraviolet ◽  
Grazing Incidence ◽  
Reflectance Spectra ◽  
Ultraviolet Range

Alignment of the aberration-free XUV Raman spectrometer at FLASH

2019 ◽  
Vol 26 (1) ◽  
pp. 18-27 ◽  
Author(s):  
Mykola Biednov ◽  
Günter Brenner ◽  
Benjamin Dicke ◽  
Holger Weigelt ◽  
Barbara Keitel ◽  
...  
Keyword(s):  
Extreme Ultraviolet ◽  
Laser Interferometry ◽  
Grazing Incidence ◽  
Stray Light ◽  
Optical Scheme ◽  
Optical Elements ◽  
X Ray ◽  
Raman Spectrometer ◽  
Optical Alignment

An extreme-ultraviolet (XUV) double-stage Raman spectrometer is permanently installed as an experimental end-station at the PG1 beamline of the soft X-ray/XUV free-electron laser in Hamburg, FLASH. The monochromator stages are designed according to the Czerny–Turner optical scheme, adapted for the XUV photon energy range, with optical elements installed at grazing-incidence angles. Such an optical scheme along with the usage of off-axis parabolic mirrors for light collimation and focusing allows for aberration-free spectral imaging on the optical axis. Combining the two monochromators in additive dispersion mode allows for reaching high resolution and superior stray light rejection, but puts high demands on the quality of the optical alignment. In order to align the instrument with the highest precision and to quantitatively characterize the instrument performance and thus the quality of the alignment, optical laser interferometry, Hartmann–Shack wavefront-sensing measurements as well as off-line soft X-ray measurements and extensive optical simulations were conducted. In this paper the concept of the alignment scheme and the procedure of the internal optical alignment are presented. Furthermore, results on the imaging quality and resolution of the first monochromator stage are shown.

Analysis of buried interfaces in multilayer mirrors using grazing incidence extreme ultraviolet reflectometry near resonance edges

2015 ◽  
Vol 54 (35) ◽  
pp. 10351 ◽  
Author(s):  
M. G. Sertsu ◽  
M. Nardello ◽  
A. Giglia ◽  
A. J. Corso ◽  
C. Maurizio ◽  
...  
Keyword(s):  
Extreme Ultraviolet ◽  
Grazing Incidence ◽  
Multilayer Mirrors ◽  
Buried Interfaces ◽  
Near Resonance

First measurements of highly ionized impurity emission distribution by grazing-incidence flat-field extreme ultraviolet spectrometer in HL-2A

2014 ◽  
Vol 85 (11) ◽  
pp. 11E426 ◽  
Author(s):  
Zhengying Cui ◽  
Chunfeng Dong ◽  
Hangyu Zhou ◽  
Shigeru Morita ◽  
Ping Sun ◽  
...  
Keyword(s):  
Extreme Ultraviolet ◽  
Grazing Incidence ◽  
Flat Field ◽  
Ultraviolet Spectrometer

scholarly journals Low- and High-Order Nonlinear Optical Characterization of Metal Sulfide Quantum Dots -=SUP=-*-=/SUP=-

2019 ◽  
Vol 127 (8) ◽  
pp. 291
Author(s):  
R.A. Ganeev
Keyword(s):  
Quantum Dots ◽  
Nonlinear Optical ◽  
Extreme Ultraviolet ◽  
Nonlinear Refraction ◽  
Metal Sulfide ◽  
Laser Pulses ◽  
High Order ◽  
Ultrashort Laser Pulses ◽  
Practical Applications ◽  
Ultraviolet Range

Any new synthesized semiconductor nanoparticles or quantum dots (QDs) require to be examined under different conditions using laser pulses of variable energies, wavelengths and durations to understand the nonlinear optical mechanisms and distinguish their attractive properties for practical applications. Among various QDs the metal sulfides took special attention due to their advanced nonlinear optical properties. Additionally, laser ablation can readily produce plasmas containing QDs that could be used for different applications. One of them is that they can be used as emitters for harmonic generation from ultrashort laser pulses. Here we review recent studies of different low- and high-order optical nonlinearities of metal sulfide QDs, such as optical limiting, two-photon, saturable and reverse saturable types of nonlinear absorption, nonlinear refraction, and generation of high-order harmonics in extreme ultraviolet range.

Spectral Observations of the Extreme Ultraviolet Astronomical Background Radiation

1988 ◽  
Vol 102 ◽  
pp. 63-66
Author(s):  
S. Labov ◽  
S. Bowyer
Keyword(s):  
Interstellar Medium ◽  
Background Radiation ◽  
Extreme Ultraviolet ◽  
Grazing Incidence ◽  
Sounding Rocket ◽  
Interstellar Space ◽  
Spectral Measurements ◽  
Interstellar Gas ◽  
Hot Plasma ◽  
Far Ultraviolet

AbstractObservations in the far ultraviolet and soft x-ray bands suggest that the interstellar medium contains several components of high temperature gas (105to 106K). If large volumes of local interstellar space are filled with this hot plasma, emission lines will be produced in the extreme ultraviolet (EUV). Diffuse EUV radiation, however, has only been detected with photometric instruments; no spectral measurements exist below 520Å. We have designed a unique grazing incidence spectrometer to study the diffuse emission between 80 and 650Å with 10 to 30Å resolution. This instrument was successfully flown on a sounding rocket in April of 1986 and a preliminary analysis reveals several features. In addition to the expected interplanetary He I 584Å emission and the geocoronal He II 304Å emission, other features appear which may originate in the hot ionized interstellar gas. These features are discussed along with the possible implications to the hot phase of the interstellar medium.

scholarly journals KORTES Mission for Solar Activity Monitoring Onboard International Space Station

2021 ◽  
Vol 8 ◽  
Author(s):  
Alexey Kirichenko ◽  
Sergey Kuzin ◽  
Sergey Shestov ◽  
Artem Ulyanov ◽  
Andrey Pertsov ◽  
...  
Keyword(s):  
International Space Station ◽  
Extreme Ultraviolet ◽  
Space Station ◽  
Active Regions ◽  
Grazing Incidence ◽  
X Rays ◽  
International Space ◽  
X Ray ◽  
Doppler Shifts ◽  
Chromospheric Evaporation

We present a description of the recent advances in the development of the KORTES assembly—the first solar oriented mission designed for the Russian segment of the International Space Station. KORTES consists of several imaging and spectroscopic instruments collectively covering a wide spectral range extending from extreme ultraviolet (EUV) wavelengths to X-rays. The EUV telescopes inside KORTES will trace the origin and dynamics of various solar phenomena, e.g., flares, CMEs, eruptions etc. EUV spectra provided by grazing-incidence spectroheliographs will enable precise DEM-diagnostics during these events. The monochromatic X-ray imager will observe the formation of hot plasma in active regions and outside them. The SolpeX module inside KORTES will offer an opportunity to measure fluxes, Doppler shifts and polarization of soft X-ray emission both in lines and continuum. SolpeX observations will contribute to studies of particle beams and chromospheric evaporation. The instrumentation of KORTES will employ a variety of novel multilayer and crystal optics. The deployment of KORTES is planned for 2024.

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