Patent ID: 6700915
Filing Date: 2004-03-02
Classification: G03F,H01S

Abstract:
An excimer or molecular fluorine laser system, comprising:a discharge chamber filled with a gas mixture at least including a halogen-containing species and a buffer gas; a plurality of electrodes within the discharge chamber connected to a discharge circuit for energizing the gas mixture; and a resonator including the discharge chamber therein for generating a laser beam, wherein the resonator further includes: a retro-reflective array for making wavefront corrections to the laser beam; a beam expander before the retro-reflective array for increasing a radius of curvature of a wavefront associated with the laser beam incident on the array; and one or more line-narrowing optical elements including a dispersive element other than the retro-reflective array for narrowing a bandwidth of the laser beam to 0.6 pm or less.