Abstract: Disclosed is an optical dental caries diagnostic device and an optical diagnostic device for periodontal diseases that can quantitatively diagnose progression of dental caries or periodontal diseases, and an optical diagnostic method including the same. Also disclosed is a diagnostic system including such diagnostic devices. The optical dental caries diagnostic device (1) has a probe (30) having optical transparency and a taper shape with an end portion to be in contact with a tooth, a light source (20) emitting light to the probe (30), and a light receiving element (40) receiving light from the end portion of the probe (30).

Abstract: An optical control system receives an incident light wave containing a plurality of wavelength components and is capable of giving different spatial light intensity distributions respectively to the wavelength components and of easily changing the color characteristic of an outgoing light wave. The optical control system is applied to illumination systems and light sources for displays, and to a method and an apparatus for process control using such modulated light.