Patent ID: 6322220
Filing Date: 2001-11-27
Classification: G03F,H01S

Abstract:
An exposure apparatus for exposing a substrate with a pattern of a mask by use of light from a laser, said apparatus comprising:dispersing means for dividing light into beams having different wavelengths and directing the light beams in different directions;focusing means for focusing the beams having the different wavelengths, from said dispersing means, upon a predetermined plane, said focusing means causing the beams to be incident on the predetermined plane at different positions; andwavelength selecting means for selecting light beams of particular wavelengths from among the beams having different wavelengths focused on the plane, said wavelength selecting means including a pair of movable light blocking plates operable to define a slit through which the light beams of the particular wavelengths pass, wherein said wavelength selecting means changes the positions of said movable light blocking plates so that a bandwidth of the light beams of the particular wavelengths varies while a central wavelength of the light beams of the particular wavelengths is maintained,wherein said laser has a predetermined mirror at an end of a resonator thereof, and an output mirror at another end of said resonator, wherein said wavelength selecting means, said focusing means and said dispersion means are disposed between said predetermined mirror and said output mirror, in this order from said predetermined mirror.