Inspec keywords: diameter measurement; diffraction gratings; laser beams; optical testing; laser variables measurement

Other keywords: ruling duty cycle; diffraction gratings; beam divergence; ruling periodicity; Ronchi rulings; Gaussian laser beam diameter; ruling type; ruling contrast; laser variables measurement

Subjects: Laser beam interactions and properties; Laser beam characteristics and interactions; Spatial variables measurement; Spatial variables measurement; Optical variables measurement; Optical interferometry; Optical testing techniques; Gratings, echelles