Optical energy collecting and transmitting apparatus using tubular light transmitting element

摘要

A tubular light transmitting element made of silica glass having an excellent light transmission efficiency and serving to transmit optical energy from a light source to a desired location. The tubular member defines a bore thereinside which is plugged at its light inlet and light outlet end portions each by a material whose refractive index is equal to or smaller than that of the tubular member.