Multi-axis interferometer with procedure and data processing for mirror mapping
First Claim
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1. A method, comprising:
- locating a plurality of alignment marks on a moveable stage;
interferometrically measuring a position of a measurement object along an axis of an interferometer for each of the alignment mark locations by simultaneously directing three measurement beams to contact the measurement object at a common location and to form three output beams from the measurement beams, each output beam including interferometric information about a distance between the interferometer and the measurement object along a respective axis; and
deriving information about a surface figure of the measurement object using the interferometric position measurements,wherein the position of the measurement object is measured using an interferometry assembly of the interferometer and either the measurement object or the interferometry assembly are attached to the stage.
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Abstract
In general, in one aspect, the invention features methods that include locating a plurality of alignment marks on a moveable stage, interferometrically measuring a position of a measurement object along an interferometer axis for each of the alignment mark locations, and using the interferometric position measurements to derive information about a surface figure of the measurement object. The position of the measurement object is measured using an interferometry assembly and either the measurement object or the interferometry assembly are attached to the stage.
98 Citations
39 Claims
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1. A method, comprising:
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locating a plurality of alignment marks on a moveable stage; interferometrically measuring a position of a measurement object along an axis of an interferometer for each of the alignment mark locations by simultaneously directing three measurement beams to contact the measurement object at a common location and to form three output beams from the measurement beams, each output beam including interferometric information about a distance between the interferometer and the measurement object along a respective axis; and deriving information about a surface figure of the measurement object using the interferometric position measurements, wherein the position of the measurement object is measured using an interferometry assembly of the interferometer and either the measurement object or the interferometry assembly are attached to the stage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A system, comprising:
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a moveable stage; an alignment sensor configured to locate alignment marks associated with the moveable stage; a interferometer assembly configured to simultaneously direct three measurement beams to contact a measurement object at a common location and produce three output beams from the measurement beams, each output beam including interferometric information about a distance between the interferometer and a measurement object along a respective axis, the interferometer assembly or the measurement object being attached to the moveable stage; and an electronic processor configured to derive information about a surface figure of the measurement object based on data acquired by locating the plurality of alignment marks with the alignment sensor and measuring the position of the measurement object along one of the respective axes of the interferometer assembly for each of the alignment mark locations. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A method, comprising:
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locating a plurality of alignment marks on a moveable stage; interferometrically measuring a position of a measurement object along an interferometer axis for each of the alignment mark locations; deriving information about a surface figure of the measurement object using the interferometric position measurements; and determining the surface figure of the measurement object using the information, wherein the position of the measurement object is measured using an interferometry assembly and either the measurement object or the interferometry assembly are attached to the stage and determining the surface figure of the measurement object comprises using values of a parameter associated with a displacement of the measurement object along three different measurement axes in addition to the information, where the parameter values are determined by interferometrically monitoring the displacement of the measurement object along each of the three different interferometer axes while moving the measurement object relative to the interferometry assembly and determining the parameter values for different positions of the measurement object from the monitored displacements, wherein for a given position the parameter is based on the displacements of the measurement object along each of the three different interferometer axes at the given position, and where determining the surface figure of the measurement object comprises frequency transforming the parameter values. - View Dependent Claims (37, 38, 39)
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Specification