Patent ID: 8233203

Claim:
An exposure method comprising the steps of: splitting a laser beam emitted from a first laser oscillator into a first laser beam and a second laser beam; illuminating a hologram recording medium with the first laser beam through a mask having a first pattern while illuminating the hologram recording medium with the second laser beam, thereby recording a hologram with the first pattern in the hologram recording medium; illuminating the hologram recording medium in which the hologram is recorded with a third laser beam which is emitted from a second laser oscillator; and delivering the third laser beam which has passed through the hologram recording medium onto a resist by using an optics configured to reduce a size of the first pattern, thereby forming a second pattern in the resist, wherein a wavelength of the third laser beam is shorter than wavelengths of the first laser beam and the second laser beam, and wherein the wavelength of the third laser beam is 1/(0.5×n) (where n is an integer not less than 3) of that of the first laser beam and the second laser beam.