Normal incidence multilayer gratings for the extreme ultraviolet region: experimental measurements and computational modeling

John F. Seely; Leonid I. Goray

doi:10.1117/12.363650

29 September 1999 Normal incidence multilayer gratings for the extreme ultraviolet region: experimental measurements and computational modeling

John F. Seely, Leonid I. Goray

Author Affiliations +

Proceedings Volume 3766, X-Ray Optics, Instruments, and Missions II; (1999) https://doi.org/10.1117/12.363650
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

The normal incidence efficiencies of a 2400 groove/mm master grating and a replica gratin were measured using synchrotron radiation in the extreme UV region. As a result of the replication process, the replica grating had an aluminum surface with an oxide layer. An additional thin SiO₂ coating was applied to the oxidized aluminum surface for the purpose of reducing the microroughness. The efficiency of the replica grating as a function of wavelength had an oscillatory behavior that resulted from a thin-film interference effect associated with the SiO₂ coating. The measured efficiencies were compared to the efficiencies calculated by a computer program that is based on the modified integral approach. The calculation accounts for the groove profile as determined from atomic force microscopy, the optical properties of the grating surface and the three layers, and the polarization of the incident radiation. The measured and calculated efficiencies are in good overall agreement.

Citation Download Citation

John F. Seely and Leonid I. Goray "Normal incidence multilayer gratings for the extreme ultraviolet region: experimental measurements and computational modeling", Proc. SPIE 3766, X-Ray Optics, Instruments, and Missions II, (29 September 1999); https://doi.org/10.1117/12.363650

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