Method and apparatus for performing optical imaging using frequency-domain interferometry
First Claim
1. An apparatus comprising:
- a first arrangement providing a first electro-magnetic radiation to a sample and a second electro-magnetic radiation to a non-reflective reference, wherein a frequency of radiation provided by the first arrangement varies over time; and
a second arrangement detecting an interference between a third radiation associated with the first radiation and a fourth radiation associated with the second radiation.
2 Assignments
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Accused Products
Abstract
An apparatus and method are provided. In particular, at least one first electro-magnetic radiation may be provided to a sample and at least one second electro-magnetic radiation can be provided to a non-reflective reference. A frequency of the first and/or second radiations varies over time. An interference is detected between at least one third radiation associated with the first radiation and at least one fourth radiation associated with the second radiation. Alternatively, the first electro-magnetic radiation and/or second electro-magnetic radiation have a spectrum which changes over time. The spectrum may contain multiple frequencies at a particular time. In addition, it is possible to detect the interference signal between the third radiation and the fourth radiation in a first polarization state. Further, it may be preferable to detect a further interference signal between the third and fourth radiations in a second polarization state which is different from the first polarization state. The first and/or second electro-magnetic radiations may have a spectrum whose mean frequency changes substantially continuously over time at a tuning speed that is greater than 100 Tera Hertz per millisecond.
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Citations
95 Claims
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1. An apparatus comprising:
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a first arrangement providing a first electro-magnetic radiation to a sample and a second electro-magnetic radiation to a non-reflective reference, wherein a frequency of radiation provided by the first arrangement varies over time; and a second arrangement detecting an interference between a third radiation associated with the first radiation and a fourth radiation associated with the second radiation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method comprising the steps of:
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providing a first electro-magnetic radiation to a sample and a second electro-magnetic radiation to a non-reflective reference, wherein a frequency of the at least one of the first electro-magnetic radiation or the second electro-magnetic radiations varies over time; and detecting an interference between a third radiation associated with the first radiation and a fourth radiation associated with the second radiation.
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21. An apparatus comprising:
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a first arrangement providing a first electro-magnetic radiation to a sample and a second electro-magnetic radiation to a reference, wherein at least one of the first electro-magnetic radiation or the second electro-magnetic radiations has a spectrum which changes over time, the spectrum containing multiple differing longitudinal modes; and a second arrangement detecting an interference between a third radiation associated with the first radiation and a fourth radiation associated with the second radiation. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A method comprising:
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providing a first electro-magnetic radiation to a sample and a second electro-magnetic radiation to a reference, wherein at least one of the first electro-magnetic radiation or the second electro-magnetic radiation has a spectrum which changes over time, the spectrum containing multiple differing longitudinal modes; and detecting an interference between a third radiation associated with first radiation and a fourth radiation associated with the second radiation. - View Dependent Claims (47)
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48. An apparatus comprising:
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a first arrangement providing a first electro-magnetic radiation to a sample and a second electro-magnetic radiation to a reference, wherein a frequency of radiation provided by the first arrangement varies over time; a polarization modulator arrangement which is configured to modulate a polarization of at least one of the first electro-magnetic radiation or the second electro-magnetic radiation over time; a second arrangement detecting a first interference signal between a third radiation associated with the first radiation and a fourth radiation associated with the second radiation in a first polarization state; and a third arrangement detecting a second interference signal between the third and fourth electro-magnetic radiations in a second polarization state, wherein the first and second polarization states being different from one another. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69)
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70. A method comprising:
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providing a first electro-magnetic radiation to a sample and a second electro-magnetic radiation to a reference, wherein a frequency of the at least one of the first electro-magnetic radiation or the second electro-magnetic radiations varies over time; modulating a polarization of at least one of the first electro-magnetic radiation or the second electro-magnetic radiation over time; detecting a first interference signal between a third radiation associated with the first radiation and a fourth radiation associated with the second radiation in a first polarization state; and detecting a second interference signal between the third and fourth electro-magnetic radiations in a second polarization state, wherein the first and second polarization states being different from one another. - View Dependent Claims (71)
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72. An apparatus comprising:
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a first arrangement providing a first electro-magnetic radiation to a sample and a second electro-magnetic radiation to a reference, wherein at least one of the first electro-magnetic radiation or the second electro-magnetic radiation has a spectrum whose mean frequency changes substantially continuously over time at a tuning speed that is greater than 100 Tera Hertz per millisecond; and a second arrangement detecting an interference between a third radiation associated with the first radiation and a fourth radiation associated with the second radiation. - View Dependent Claims (73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93)
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94. A method comprising:
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providing a first electro-magnetic radiation to a sample and a second electro-magnetic radiation to a reference, wherein at least one of the first electro-magnetic radiation or the second electro-magnetic radiation has a spectrum whose mean frequency changes substantially continuously over time at a tuning speed that is greater than 100 Tera Hertz per millisecond; and detecting an interference between at least one third radiation associated with the first radiation and a fourth radiation associated with the second radiation.
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95. An apparatus comprising:
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a first arrangement configured to provide first electro-magnetic radiation to a sample and a second electro-magnetic radiation to a reference, wherein a frequency of at least one of the first electromagnetic radiation or the second electromagnetic radiations provided by the first arrangement varies over time; a second arrangement configured to shift the frequency of at least one of the first electro-magnetic radiation or the second electromagnetic radiation and further configured to at least partially reduce, differentiate or eliminate negative frequency components of the interference; an interferometer interfering the first and second electro-magnetic radiations to produce an interference signal; and a third arrangement configured to detect the interference between the first and second electro-magnetic radiations.
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Specification