Patent ID: 6907177

Claim:
A method for designing a light guide in which light-scattering particles are contained in an optical medium so that light which enters the light guide from a first end face can propagate to a second end face while being scattered by the light-scattering particles, comprising the steps of: (a) determining a desired value of a light-output efficiency of the light guide; and (b) determining values of a scattering cross section Φ of each of said light-scattering particles, a density N p of the light-scattering particles in the optical medium, and a length L G of the optical medium in a light propagation direction so as to satisfy a relationship, E out =exp{−(Φ· Np·L G ·K c )}· K L , where K c and K L are a correction coefficient and a loss coefficient of the light guide, respectively.