SYSTEM AND METHOD OF REPRODUCING AND ERASING INFORMATION

摘要

In a method of recording information by changes of refractive index and light absorption coefficient on a thin film (3), and reproducing the recorded information by
scanning a focussed monochromatic light along a track on a thin film (3) of a selected thickness and
letting a light component reflected at a light-incident surface (71) of said thin film (3) and the other light component reflected at an inside face (72) of the opposite surface to said incident surface (71) of the thin film (3) interfere with each other thereby efficiently to vary intensity of reflection light.