The 33009FL01-290R Plane Ruled Reflection Grating is 25 x 25 mm and 6 mm thick. The grating has 1800 grooves per mm a nominal wavelength at 500 nm, and a nominal blaze angle of 26.7°. The diffraction grating is coated with an aluminum coating on float glass substrate and designed for first order Littrow use. Richardson Gratings' plane ruled reflection gratings have high efficiency in the spectral region around their blaze wavelengths. Ruled gratings are most efficient when used in the Littrow configuration.

33009FL01-290R平面直纹反射光栅为25×25毫米和6毫米厚。光栅每毫米1800槽一个名义上的波长为500 nm,和一个名义闪耀角26.7°。衍射光栅是在浮法玻璃基板上涂上一层铝涂层,设计用于一阶小排。理查森光栅的平面规则反射光栅在其火焰波长周围的光谱区域具有很高的效率。规则光栅在小行配置中使用时效率最高。