Phase-locked, time-delayed harmonic pulses for high spectral resolution in the extreme ultraviolet

2001 ◽  
Vol 26 (13) ◽  
pp. 1010 ◽  
Author(s):  
M. Bellini ◽  
S. Cavalieri ◽  
C. Corsi ◽  
M. Materazzi
Keyword(s):  
Spectral Resolution ◽  
Extreme Ultraviolet ◽  
High Spectral Resolution

Phase-locked, time-delayed, harmonic pulses for high spectral resolution in the extreme ultraviolet: errata

2001 ◽  
Vol 26 (21) ◽  
pp. 1729
Author(s):  
M. Bellini ◽  
S. Cavalieri ◽  
C. Corsi ◽  
M. Materazzi
Keyword(s):  
Spectral Resolution ◽  
Extreme Ultraviolet ◽  
High Spectral Resolution

A high-efficiency and high-spectral-resolution EUV/soft X-ray monochromator based on off-plane diffraction

2020 ◽  
Vol 27 (1) ◽  
pp. 25-30 ◽  
Author(s):  
Werner Jark
Keyword(s):  
Spectral Resolution ◽  
High Efficiency ◽  
Extreme Ultraviolet ◽  
Incident Beam ◽  
Grazing Incidence ◽  
Incident Radiation ◽  
High Spectral Resolution ◽  
X Ray ◽  
Grating Monochromator ◽  
Plane Diffraction

The most efficient diffraction at a periodic grating structure is expected to take place when the incident radiation can be considered to have been specularly reflected off the inclined part of grooves that are positioned parallel to the trajectory of the incident beam. Very encouraging results for this configuration, in which the diffraction takes place off-plane, have been reported recently for a grating to be used in a spectrometer for space science investigations. This grating provided high efficiency for a relatively large groove density and a large blaze angle. High efficiency was observed even in higher diffraction orders up to the fourth order. Here the performance parameters, especially for the combination of diffraction efficiency and achievable spectral resolution, will be discussed for a grating used in a grazing-incidence plane-grating monochromator for monochromatization of synchrotron radiation in the extreme ultraviolet (EUV) and soft X-ray range with photon energies between 30 eV and 2000 eV. It is found that the instrument can provide competitive spectral resolution in comparison with the use of in-plane diffraction. In the case of comparable spectral resolution, the off-plane diffraction is found to provide superior efficiency.

On obtaining high spectral resolution in extreme ultraviolet/soft X-ray monochromators operating off-plane diffraction in a divergent incident beam

2020 ◽  
Vol 27 (6) ◽  
pp. 1499-1509
Author(s):  
Werner Jark
Keyword(s):  
Spectral Resolution ◽  
Extreme Ultraviolet ◽  
Specular Reflection ◽  
Incident Beam ◽  
Diffraction Order ◽  
Source Size ◽  
Resolving Power ◽  
High Spectral Resolution ◽  
Radiation Beam ◽  
X Ray

When the trajectory of an incident beam is oriented parallel to the grooves of a periodic grating structure the radiation beam is diffracted off-plane orthogonal to the plane of incidence. The diffraction efficiency in this condition is very high and in a grating with a sawtooth profile it can approach the reflection coefficient for a simple mirror, when the diffraction order of interest follows the direction for specular reflection at the flat part of the steps. When this concept is used in a plane grating in a monochromator for synchrotron radiation sources, the incident beam is almost always collimated in order to minimize any deterioration of the beam properties due to aberrations, which will be introduced in the diffraction process when an uncollimated beam is used. These aberrations are very severe when the groove density is constant. It will be shown that the effect of these aberrations can be corrected after the diffraction by the use of astigmatic focusing. The latter can be provided by a crossed mirror pair with different focal lengths in the corresponding orthogonal directions. Then a monochromator based on this concept can provide source size limited spectral resolution in an uncollimated incident beam. This is identical to the spectral resolution that can be provided by the same grating when operated at the same position in a collimated incident beam. The source size limited spectral resolution in this case corresponds to a high spectral resolving power of better than ΔE/E = 10 000 for photon energies around 300 eV in the soft X-ray range.

scholarly journals A coma-free super-high resolution optical spectrometer using 44 high dispersion sub-gratings

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hua-Tian Tu ◽  
An-Qing Jiang ◽  
Jian-Ke Chen ◽  
Wei-Jie Lu ◽  
Kai-Yan Zang ◽  
...  
Keyword(s):  
High Resolution ◽  
Spectral Resolution ◽  
Wavelength Region ◽  
Ultra Violet ◽  
High Spectral Resolution ◽  
Visible Range ◽  
High Dispersion ◽  
Charge Coupled Device ◽  
Wide Range ◽  
High Resolution Spectrometer

AbstractUnlike the single grating Czerny–Turner configuration spectrometers, a super-high spectral resolution optical spectrometer with zero coma aberration is first experimentally demonstrated by using a compound integrated diffraction grating module consisting of 44 high dispersion sub-gratings and a two-dimensional backside-illuminated charge-coupled device array photodetector. The demonstrated super-high resolution spectrometer gives 0.005 nm (5 pm) spectral resolution in ultra-violet range and 0.01 nm spectral resolution in the visible range, as well as a uniform efficiency of diffraction in a broad 200 nm to 1000 nm wavelength region. Our new zero-off-axis spectrometer configuration has the unique merit that enables it to be used for a wide range of spectral sensing and measurement applications.

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