Magnification calibration diffraction grating replicas, 500nm

Carbon grating replica with Au/Pd shadowing on a cross line grating with well-defined trench type grooves. Pitch or "d" spacing for parallel line grating is 500nm. The trench type groove makes it easy to measure the pitch. Typically, cross line grating is used up to 100,000x with 2,000 lines/mm in both directions. Instructions included. Made on a G400, 400 square mesh copper grid.