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US3868185A
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Asymmetric michelson interferometer for solid state infra-red spectroscopy
Assignee: Max-Planck-Gesellschaft zur Förderung der Wissenschaften eV
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Filing: 1973-10-18
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Granted: 1975-02-25
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Expires: 1993-10-18
Abstract
Abstract An asymmetric Michelson interferometer for infra-red solid state spectroscopy includes two concave mirrors of short focal length positioned in reference and sample beam paths leading respectively from a beam splitter to a retro-reflector and sample holder located close together in a low-temperature sample chamber at the focal points of the respective concave mirrors. The reference and sample beams have a ''''folded'''' geometry afforded by respective right angled mirrors, corner-cube reflectors or the like.
Inventors
- 👤 Ludwig Genzel
- 👤 Jurgen Gast
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:15
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/02; G01J3/0202; G01J3/28; G01J3/45; G01J3/453
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
187 words
An asymmetric Michelson interferometer comprising: a radiation source for producing measurement beam; a beam splitter on which said measurement beam is arranged to fall to be divided into a sample beam and a reference beam; a sample holder for holding a sample from which said sample beam is reflected back to said beam splitter; an end mirror from which said reference beam is reflected back to said beam splitter; an adjustment arrangement for varying the optical length of the reference beam path relative to that of the sample beam path; at least two concave mirrors of short focal length, each disposed in said reference beam path and said sample beam path respectively, and where said sample holder and said end mirror are close to one another and disposed at the focal points of each of said concave mirrors; at least two reflector arrangements disposed between said beam splitter and said concave mirrors, for reflecting the reference and sample beams parallel but laterally transposed and wherein said adjustment arrangement is capable of displacing at least one of said two reflectors in a direction parallel to said parallel beams.
Claim 2
Dependent Claim
187 words
An asymmetric Michelson interferometer comprising: a radiation source for producing measurement beam; a beam splitter on which said measurement beam is arranged to fall to be divided into a sample beam and a reference beam; a sample holder for holding a sample from which said sample beam is reflected back to said beam splitter; an end mirror from which said reference beam is reflected back to said beam splitter; an adjustment arrangement for varying the optical length of the reference beam path relative to that of the sample beam path; at least two concave mirrors of short focal length, each disposed in said reference beam path and said sample beam path respectively, and where said sample holder and said end mirror are close to one another and disposed at the focal points of each of said concave mirrors; at least two reflector arrangements disposed between said beam splitter and said concave mirrors, for reflecting the reference and sample beams parallel but laterally transposed and wherein said adjustment arrangement is capable of displacing at least one of said two reflectors in a direction parallel to said parallel beams.
Claim 3
Dependent Claim
28 words
An asymmetric Michelson interferometer according to claim 1, wherein the concave mirrors are disposed next to one another and comprise mirror surfaces in the form of extra-axial paraboloids.
Claim 4
Dependent Claim
25 words
An asymmetric Michelson interferometer according to claim 2, wherein the reflector arrangements each comprise a right-angle mirror, a triple or corner-cube mirror, or a ''''cat''s-eye.''''
Claim 5
Dependent Claim
29 words
An asymmetric Michelson interferometer according to claim 3, wherein the reference beam path and the sample beam path cross one another between the concave mirrors and their corresponding foci.
Claim 6
Dependent Claim
44 words
An asymmetric Michelson interferometer according to claim 4, wherein the sample holder and the end mirror are disposed in a closed sample chamber comprising a window which is transparent to the measurement radiation and which is situated in the crossover region of the beams.
Claim 7
Dependent Claim
102 words
An asymmetric Michelson interferometer according to claim 1, wherein a reflecting element is arranged in each of the reference and sample beam paths between the beam splitter and each concave mirror, said reflecting element reflecting in approximately parallel directions the beams diverging from the beam splitter at a wide angle, and wherein the reflector arrangements are disposed in the paths of these reflected beams behind the sample holder as well as behind the end mirror, as seen from the beam splitter, and that the concave mirrors are disposed in the space between the beam splitter and the sample holder and end mirror.
Claim 8
Dependent Claim
64 words
An asymmetric Michelson interferometer according to claim 1, wherein the reference and sample beams which diverge from the beam splitter at a wide angle, first fall on the reflection arrangements and then are each thrown on the concave mirrors over a reflecting arrangement, said concave mirrors being disposed next to one another between the beam splitter and the sample holder and the end mirror.
Claim 9
Dependent Claim
49 words
An asymmetric Michelson interferometer according to claim 1, wherein a directing mirror is disposed between the concave mirrors and the end mirror and the sample respectively, to divert the relevant beams 90*, and that an adjustable three-point support is provided for holding the sample and the end mirror respectively.
References Cited (Backward Citations)
US2571937A
Cited
US3776636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |