Abstract

The performance of a spectrometer that uses a blazed multilayer-coated grating and that is based on the Seya–Namioka mount is analyzed. In the extreme-UV wavelength region, the efficiency of the grating is relatively high in a narrow bandpass that is defined by the reflectance of the multilayer coating. The bandpass can be shifted in wavelength by rotation of the grating, as is the case for the Seya–Namioka mount, for which the angle of incidence on the grating is near 35°. It is shown that when the source is slightly off the Rowland circle, as occurs when the grating is rotated and the source-to-grating distance is fixed, one can maintain good focusing can be maintained by moving the detector over a small range of distance and angle. The multilayer coating can be designed so that the grating remains on-blaze in wavelength regions of interest and in particular orders as the grating is rotated. A spectrometer composed of a multilayer grating and a movable detector can have relatively high throughput and resolving power in the extreme-UV region. When the grating is rotated, the wavelength coverage is wider than is the case for incidence angles near normal.

© 1993 Optical Society of America

Polarization and efficiency of a concave multilayer grating in the 135–250-Å region and in normal-incidence and Seya–Namioka mounts

J. F. Seely, R. G. Cruddace, M. P. Kowalski, W. R. Hunter, T. W. Barbee, J. C. Rife, R. Eby, and K. G. Stolt
Appl. Opt. 34(31) 7347-7354 (1995)

On-blaze operation of a Mo/Si multilayer-coated, concave diffraction grating in the 136–142-Å wavelength region and near normal incidence

J. F. Seely, M. P. Kowalski, W. R. Hunter, J. C. Rife, T. W. Barbee, G. E. Holland, C. N. Boyer, and C. M. Brown
Appl. Opt. 32(25) 4890-4897 (1993)

Grazing-incidence efficiencies in the 28–42-Å wavelength region of replicas of the Skylab 3600-line/mm concave grating with multilayer and gold coatings

W. R. Hunter, J. F. Seely, M. P. Kowalski, J. C. Rife, and T. W. Barbee
Appl. Opt. 36(25) 6411-6415 (1997)

SiC/W/Ir multilayer-coated grating for enhanced efficiency in 50–100 nm wavelength range in Seya–Namioka mount

Shengnan He, Ying Liu, Jingtao Zhu, Haochuan Li, Qiushi Huang, Hongjun Zhou, Tonglin Huo, Zhanshan Wang, and Shaojun Fu
Opt. Lett. 36(2) 163-165 (2011)

Normal-incidence efficiencies of multilayer-coated laminar gratings for the Extreme-Ultraviolet Imaging Spectrometer on the Solar-B mission

John F. Seely, Charles M. Brown, David L. Windt, Soizik Donguy, and Benjawan Kjornrattanawanich
Appl. Opt. 43(7) 1463-1471 (2004)