NEW: All of these Ronchi Rulings and Grid patterns are available on 12mm, 16mm and 25mm glass discs, 1.5mm thick - ideal for experimental work and optical benches. E-mail email@example.com for more information.
Vacuum deposited chrome gratings on glass substrate. Typically used for testing of resolution, field distortion and parfocal stability, but may be paired to provide interference patterns (fringe patterns) and as light gates.
* grating frequencies in images below not to scale