Plane Ruled Diffraction Grating, 1800 g/mm, 500 nm, 26.7°

Plane Ruled Diffraction Grating, 1800 grooves per mm, 500 nm nominal blaze wavelength (1st order Littrow), 26.7° nominal blaze angle

Plane Ruled Diffraction Grating, 1800 grooves per mm, 500 nm nominal blaze wavelength (1st order Littrow), 26.7° nominal blaze angle