SLITS
EO-72 Single Slits consists of nickel film etched with three 15 mm long slits, 0.5, 0.3, and 0.1 mm wide.
EO-73 Double Slits consists of nickel film etched with three patterns: 0.2 mm wide lines 1 mm separation, 0.2 mm lines 0.5 mm separation, 0.15 mm wide 0.3 mm separation.
EO-77 Diffraction Grating is a 700 lines/mm holographic grating 20 x 33 mm.