Prism optics stable with respect to wavelength and temperature variations and optical information processing apparatus

摘要

Prism optics for changing the shape of a light beam, including a composite prism consisting of at least two types of prisms made of materials having different variations in the refractive index due to variations of the refractive index due to wavelength variations and to temperature variations, which materials are so chosen that the angle of the light beam exitting from the prism optics remains almost constant, independent of variations in the wavelength of the light beam and temperature, and an optical information processing apparatus using these prism optics.