Collector mirror assembly and method for producing extreme ultraviolet radiation
First Claim
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1. A collector mirror assembly comprising:
- a collector mirror having a reflective surface and a hole having an edge, the hole extending through the reflective surface;
a tubular body that extends through the hole, the tubular body having an inner surface and an outer surface, the tubular body constructed and arranged to guide a main gas flow in a direction substantially transverse to the reflective surface; and
an opening between the outer surface of the tubular body and the edge of the hole, the opening arranged to guide a further gas flow that diverges with respect to the main gas flow, wherein the opening is arranged to guide the further gas flow substantially along the reflective surface.
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Abstract
A collector mirror assembly includes a collector mirror that includes a reflective surface and a hole having an edge. The hole extends through the reflective surface. The assembly also includes a tubular body having an inner surface and an outer surface. The tubular body is constructed and arranged to guide a gas flow in a direction substantially transverse to the reflective surface. The outer surface of the tubular body and the edge of the hole form an opening arranged to guide a further gas flow that diverges with respect the gas flow substantially transverse to the reflective surface.
7 Citations
16 Claims
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1. A collector mirror assembly comprising:
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a collector mirror having a reflective surface and a hole having an edge, the hole extending through the reflective surface; a tubular body that extends through the hole, the tubular body having an inner surface and an outer surface, the tubular body constructed and arranged to guide a main gas flow in a direction substantially transverse to the reflective surface; and an opening between the outer surface of the tubular body and the edge of the hole, the opening arranged to guide a further gas flow that diverges with respect to the main gas flow, wherein the opening is arranged to guide the further gas flow substantially along the reflective surface. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A module constructed to produce extreme ultraviolet radiation, the module comprising:
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a supply configured to supply one or more droplets of an ignition material to a predetermined target ignition position; a radiation source configured to supply a laser beam arranged to be focused on the predetermined target ignition position and to produce a plasma by hitting a droplet located at the predetermined target ignition position so as to change the droplet into an extreme ultraviolet producing plasma; and a collector mirror assembly, comprising a collector mirror having a reflective surface and a hole having an edge, the hole extending through the reflective surface; a tubular body that extends through the hole, the tubular body having an inner surface and an outer surface, the tubular body constructed and arranged to guide a main gas flow in a direction substantially transverse to the reflective surface; and
an opening between the outer surface of the tubular body and the edge of the hole, the opening arranged to guide a further gas flow that diverges with respect to the main gas flow, wherein the opening is arranged to guide the further gas flow substantially along the reflective surface. - View Dependent Claims (8, 9, 10)
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11. A lithographic projection apparatus comprising:
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a collector mirror assembly, comprising; a collector mirror having a reflective surface configured to focus radiation emitted from a first focal point to a second focal point, and a hole having an edge, the hole extending through the reflective surface, a tubular body having an inner surface and an outer surface, the tubular body constructed and arranged to guide a main gas flow in a direction substantially transverse to the reflective surface, and an opening between the outer surface of the tubular body and the edge of the hole, the opening arranged to guide a further gas flow that diverges with respect to the main gas flow, wherein the opening is arranged to guide the further gas flow substantially along the reflective surface; a support configured to support a patterning device, the patterning device being configured to pattern the radiation after the radiation has passed through the second focal point to form a patterned beam of radiation; and a projection system configured to project the patterned beam of radiation onto a substrate. - View Dependent Claims (12)
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13. A method for producing extreme ultraviolet radiation, comprising:
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directing a radiation beam, such as a laser beam, onto a droplet of an ignition material, the droplet being located at a predetermined target ignition position, so as to change the droplet into a plasma that is configured to produce an extreme ultraviolet radiation; reflecting the radiation and directing a gas flow toward the predetermined target ignition position using an collector mirror assembly, the assembly comprising; a collector mirror having a reflective surface and a hole having an edge, the hole extending through the reflective surface, a tubular body having an inner surface and an outer surface, the tubular body constructed and arranged to guide a main gas flow in a direction substantially transverse to the reflective surface, and an opening between the outer surface of the tubular body and the edge of the hole, the opening arranged to guide a further gas flow that diverges with respect to the main gas flow, wherein the opening is arranged to guide the further gas flow substantially along the reflective surface. - View Dependent Claims (14, 15, 16)
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Specification