Separated beam multiple degree of freedom interferometer
First Claim
1. Interferometric apparatus comprising:
- a polarizing beam-splitting interface positioned to separate an input beam into two orthogonally polarized beams;
interferometer optics positioned to receive a first set of beams derived from one of the orthogonally polarized beams and a second set of beams derived from the other of the orthogonally polarized beams; and
intermediate optics positioned to derive the first set of beams from one of the orthogonally polarized beams and derive the second set of beams from the other of the orthogonally polarized beams,wherein the interferometer optics are configured to direct the beams in the first set to contact different respective locations of a measurement object at least once, and subsequently combine each beam in the first set with a corresponding beam from the second set of beams to produce a corresponding output beam comprising information about changes in the position of the measurement object with respect to a different degree of freedom.
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Accused Products
Abstract
An interferometric apparatus includes: a polarizing beam-splitting interface positioned to separate an input beam into two orthogonally polarized beams; and interferometer optics positioned to receive a first set of beams derived from one of the orthogonally polarized beams and a second set of beams derived from the other of the orthogonally polarized beams. The interferometer optics are configured to direct each beam in the first set to contact different locations of a measurement object at least once, and subsequently combine each beam in the first set with a corresponding beam from the second set of beams to produce a corresponding output beam comprising information about changes in the position of the measurement object with respect to a different degree of freedom.
20 Citations
68 Claims
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1. Interferometric apparatus comprising:
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a polarizing beam-splitting interface positioned to separate an input beam into two orthogonally polarized beams; interferometer optics positioned to receive a first set of beams derived from one of the orthogonally polarized beams and a second set of beams derived from the other of the orthogonally polarized beams; and intermediate optics positioned to derive the first set of beams from one of the orthogonally polarized beams and derive the second set of beams from the other of the orthogonally polarized beams, wherein the interferometer optics are configured to direct the beams in the first set to contact different respective locations of a measurement object at least once, and subsequently combine each beam in the first set with a corresponding beam from the second set of beams to produce a corresponding output beam comprising information about changes in the position of the measurement object with respect to a different degree of freedom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. Interferometric apparatus comprising:
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a polarizing beam-splitting interface positioned to separate an input beam into two orthogonally polarized beams; and interferometer optics positioned to receive a first set of beams derived from one of the orthogonally polarized beams and a second set of beams derived from the other of the orthogonally polarized beams, wherein the interferometer optics are configured to direct the beams in the first set to contact different respective locations of a measurement object at least once, and subsequently combine each beam in the first set with a corresponding beam from the second set of beams to produce a corresponding output beam comprising information about changes in the position of the measurement object with respect to a different degree of freedom, wherein the interferometer optics are configured to produce more than two output beams, each of which provides information about changes in the position of the measurement object with respect to a different degree of freedom. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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24. Interferometric apparatus comprising:
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a polarizing beam-splitting interface positioned to separate an input beam into two orthogonally polarized beams; and interferometer optics positioned to receive a first set of beams derived from one of the orthogonally polarized beams and a second set of beams derived from the other of the orthogonally polarized beams, wherein the interferometer optics are configured to direct the beams in the first set to contact different respective locations of a measurement object at least once, and subsequently combine each beam in the first set with a corresponding beam from the second set of beams to produce a corresponding output beam comprising information about changes in the position of the measurement object with respect to a different degree of freedom, further comprising polarization modification optics positioned to receive a first one of the orthogonally polarized beams and produce a modified polarized beam having a polarization orthogonal to that of the first polarized beam. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. Interferometric apparatus comprising:
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a polarizing beam-splitting interface positioned to separate an input beam into two orthogonally polarized beams; and interferometer optics positioned to receive a first set of beams derived from one of the orthogonally polarized beams and a second set of beams derived from the other of the orthogonally polarized beams, wherein the interferometer optics are configured to direct the beams in the first set to contact different respective locations of a measurement object at least once, and subsequently combine each beam in the first set with a corresponding beam from the second set of beams to produce a corresponding output beam comprising information about changes in the position of the measurement object with respect to a different degree of freedom, further comprising non-polarizing beam-splitting optics positioned to generate the first and second sets of beams from the two orthogonally polarized beams. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44)
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45. Interferometric apparatus comprising:
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a polarizing beam-splitting interface positioned to separate an input beam into two orthogonally polarized beams; and interferometer optics positioned to receive a first set of beams derived from one of the orthogonally polarized beams and a second set of beams derived from the other of the orthogonally polarized beams, wherein the interferometer optics are configured to direct the beams in the first set to contact different respective locations of a measurement object at least once, and subsequently combine each beam in the first set with a corresponding beam from the second set of beams to produce a corresponding output beam comprising information about changes in the position of the measurement object with respect to a different degree of freedom, further comprising a second polarizing beam-splitting interface positioned in the interferometer optics. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
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61. An interferometric method comprising:
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separating an input beam into two orthogonally polarized beams; deriving a first set of beams from one of the orthogonally polarized beams; deriving a second set of beams from the other of the orthogonally polarized beams; directing the beams from the first set of beams to contact different respective locations of a measurement object at least once; and subsequently combining each beam in the first set with a corresponding beam from the second set of beams to produce a corresponding output beam comprising information about changes in the position of the measurement object with respect to a different degree of freedom, wherein intermediate optics are used for the deriving steps and interferometer optics are used for the directing and combining steps. - View Dependent Claims (62, 63, 64, 65, 66, 67, 68)
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Specification