A Single-Element Plane Grating Monochromator

Photonics

关键词: optical design;    grazing incidence;    diffraction gratings;    monochromators;    geometrical aberrations;    soft X-ray;    varied line-spacing;    VLS;    in-focus;    single-element;   

DOI  :  10.3390/photonics3010003

来源: mdpi

【 摘 要 】

Concerted rotations of a self-focused varied line-space diffraction grating about its groove axis and surface normal define a new geometric class of monochromator. Defocusing is canceled, while the scanned wavelength is reinforced at fixed conjugate distances and horizontal deviation angle. This enables high spectral resolution over a wide band, and is of particular advantage at grazing reflection angles. A new, rigorous light-path formulation employs non-paraxial reference points to isolate the lateral ray aberrations, with those of power-sumover a three octave scan range. The proposed rotation scheme is not limited to plane surfaces or monochromators, providing a new degree of freedom in optical design.

【 授权许可】

CC BY   
© 2016 by the author; licensee MDPI, Basel, Switzerland.