LIGHT PROJECTING HEAD, INFORMATION STORAGE DEVICE, LIGHT PROJECTION HEAD DESIGNING DEVICE, AND LIGHT PROJECTION HEAD DESIGNING PROGRAM

摘要

A light projection head having a large size and a high light propagation performance. The light projection head comprises a first propagation section made of a first low-attenuation material and disposed along the optical axis, a pair of second propagation sections sandwiching the first propagation section and made of a second low-attenuation material, a first confinement section composed of members having a propagation performance inferior to that of the second propagation section and sandwiching the first and second propagation sections from the outside of the second propagation sections, a pair of third propagation sections made of a material having a propagation performance superior to that of the first confinement sections and sandwiching the first confinement sections from outside. A light projection head designing device for penetratingly designing a light projection head by solving an equation based on an F matrix and calculating the complex propagation constant along the optical axis is also disclosed.