Exposure apparatus and device fabrication method using the same
An exposure apparatus that irradiates excitation laser onto a target, and generates from generated plasma a light source for generating illumination light of an extreme ultraviolet region or an X-ray region includes an illumination optical system that uses the illumination light to illuminate a catoptric reticle that forms a pattern to be transferred, the illumination optical system including a first mirror closest to the light source, an ellipsoidal mirror for condensing the illumination light in front of the first mirror in the illumination optical system, and a projection optical system that reduces and projects the pattern reflected on the reticle onto an object to be exposed, wherein light where an optical-axis direction of the excitation laser proceeds beyond a position that generates the plasma by the excitation laser does not interfere with components in the exposure apparatus including the illumination and projection optical systems, and the ellipsoidal mirror.
1. An exposure apparatus that irradiates excitation laser beam onto a target, and generates from generated plasma a light source for generating illumination light of an extreme ultraviolet region or an X-ray region, said exposure apparatus comprising:
an illumination optical system that uses the illumination light to illuminate a reflection reticle, said illumination optical system including a first mirror;
a condenser mirror that condenses the illumination light from the light source and directs the illumination light to the first mirror;
a projection optical system that reduces and projects a pattern of the reflection reticle onto an object to be exposed,
wherein the excitation laser beam exiting from the target passes through a passage part in said condenser mirror, and the excitation laser beam incident upon the target passes through an opening of said condenser mirror thorough which the illumination light passes.
2. The exposure apparatus according to claim 1 , wherein said condenser mirror includes an ellipsoidal mirror.
3. An exposure apparatus that irradiates excitation laser beam onto a target, and generates from generated plasma a light source for generating illumination light of an extreme ultraviolet region or an X-ray region, said exposure apparatus comprising:
an illumination optical system that uses the illumination light to illuminate a reflection reticle, said illumination optical system including a first mirror;
a condenser mirror that condenses the illumination light from the light source and directs the illumination light to the first mirror;
a projection optical system that reduces and projects a pattern of the reflection reticle onto an object to be exposed;
a stopper that prevents the excitation laser beam from reaching the illumination optical system beyond the target; and
a cooling mechanism for cooling said stopper.
4. The exposure apparatus according to claim 3 ,
wherein said stopper includes an antireflective coating on a metal member.
5. The exposure apparatus according to claim 3 ,
wherein said stopper is located outside a chamber that houses said illumination and projection optical systems.
6. The exposure apparatus according to claim 3 , wherein said condenser mirror includes an ellipsoidal mirror.