Cost-effective plane-grating monochromator design for extreme-ultraviolet application

Abstract

The optical design of a plane-grating monochromator mainly intended for high resolution in the extreme ultraviolet and soft x-ray is presented. The configuration has three optical elements. It uses a uniform line-spaced plane grating illuminated in the converging light coming from a focusing concave mirror and an additional plane mirror that is needed to change the grating subtended angle to keep the system in focus on a fixed slit. The parameters of the focusing mirror are determined to introduce a coma that compensates for the coma given by the grating. A monochromator for the 12-50 eV region is designed for application to high-order laser harmonics.

Time-resolved XUV ARPES with tunable 24–33 eV laser pulses at 30 meV resolution

“…The dispersions at the slit using different gratings are 2.5 nm/mm (500 g/mm), 1.3 nm/mm (964 g/mm), 1.0 nm/mm (1200 g/mm). Separate from this design, various monochromator configurations can be considered for future improvements in the time-resolution, energy-resolution, and throughput 62–64 .…”

A High Resolution XUV Grating Monochromator for the Spectral Selection of Ultrashort Harmonic Pulses

“…This specific design allowed us to select the entrance arm p M of the CM to have the coma given by the grating compensated by the coma that is specifically introduced by the mirror. Reference [21] shows that the condition for coma compensation at the specific wavelength λ C is given by…”

“…Once the spectral focusing has been achieved, the main aberration introduced by the grating is the coma. In the present design, the geometrical parameters of the focusing mirror are chosen to have the coma from the grating compensated by the opposite coma given by the focusing mirror, which is specially used in a very asymmetrical configuration [21].…”

End-to-end computational design for an EUV solar corona multispectral imager with stray light suppression

“…The curved grating here works simultaneously as both imager and grating, removing the requirement to collimate mirrors, thus greatly improving the system sensitivity. The system can achieve a wide field-of-view (FOV) through scanning movement of the slits [20][21][22] . The CORONA project (America's first satellite program) employed a planar grating combined with a focusing mirror [23][24][25] , able to perform multispectral imaging with high spectral resolution and wide FOV [26] .…”