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

Area of Science:

• Optics and Photonics
• Spectroscopy
• Materials Science

Background:

• Periodic grating structures are crucial for diffraction-based optical instruments.
• Off-plane diffraction configurations have shown promise for high-efficiency applications.
• Previous studies reported encouraging results for gratings in space science spectrometers.

Purpose of the Study:

• To evaluate the performance of off-plane diffraction gratings for synchrotron radiation monochromatization.
• To analyze the trade-offs between diffraction efficiency and spectral resolution.
• To compare off-plane diffraction with in-plane diffraction for extreme ultraviolet (EUV) and soft X-ray applications.

Main Methods:

• Utilized a grazing-incidence plane-grating monochromator setup.
• Investigated gratings with high groove density and large blaze angles.
• Measured diffraction efficiency and spectral resolution across a range of photon energies (30 eV to 2000 eV).

Main Results:

• Off-plane diffraction demonstrated high efficiency, even in higher diffraction orders (up to fourth order).
• The instrument achieved competitive spectral resolution compared to in-plane diffraction methods.
• Superior efficiency was observed for off-plane diffraction at comparable spectral resolutions.

Conclusions:

• Off-plane diffraction is a highly efficient method for EUV and soft X-ray spectroscopy.
• This technique offers a compelling alternative to in-plane diffraction for synchrotron radiation applications.
• The studied grating configuration provides excellent performance for monochromatization in the specified energy range.