Rowland circle gratings
Rowland circle gratings represent the basic form of imaging concave gratings. In the Rowland circle configuration the entrance slit, grating and detector are located on a circle, the diameter of which equals the radius of the grating substrate.
This configuration ensures that the imaging of the entrance slit is free from defocusing as well as primary coma and displays only minimal spherical aberrations. Although pronounced astigmatism is present, the resulting elongation of the slit images does not significantly reduce the resolving power.
The grating structure of a Rowland circle grating, projected onto the plane surface tangent to the vertex, consists of equidistant straight grooves.
羅蘭圓光柵
羅蘭圓是物理學家羅蘭(Henry A. Rowland) 在 1880 年代初期所發(fā)現(xiàn)。羅蘭發(fā)現(xiàn)，若將縫光源和凹面光柵放置在半徑等于凹面光柵曲率半徑的圓周上，且該圓與光柵中點G相切，則由凹面光柵形成的光譜呈在這個圓周上，因為是羅蘭*先發(fā)現(xiàn)，因此該圓稱為羅蘭圓。
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