E-O probe
First Claim
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1. An E-O probe for measuring a voltage by applying a beam of radiation, comprising:
- a base part which is penetrated by said beam of radiation;
an electro-optic material which is attached to an end face of said base part, having an index of refraction which varies in response to an intensity of an electric field; and
a reflecting face formed on an end face of said electro-optic material, which reflects said beam of radiation penetrating said electro-optic material from said base part and incident on said reflecting face, wherein said beam of radiation has a predetermined thickness and the size of said reflecting face is such that a substantially entire area of said reflecting face is irradiated by said beam of radiation having said predetermined thickness, and wherein said beam of radiation is a radiation focused by an optical system including an objective lens having a numerical aperture, NA, and the size of said reflecting face is such that said substantially entire area of said reflecting face is enclosable by a circle having a diameter approximately equal to a theoretical minimum beam diameter, (2λ
)/(π
NA), wherein λ
denotes a wave length of said beam of radiation.
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Abstract
An E-O probe with improved spatial resolution has a light transmissive base part, an electro-optic material which is fixed to the base part and has an index of refraction which varies in response to an electrical field from a measured object, and a mirror which is fixed to the electro-optic material and reflects an incident beam penetrating the base part and the electro-optic material. The mirror is formed to be smaller than the incident beam in diameter. The electro-optic material is formed very thin.
9 Citations
15 Claims
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1. An E-O probe for measuring a voltage by applying a beam of radiation, comprising:
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a base part which is penetrated by said beam of radiation; an electro-optic material which is attached to an end face of said base part, having an index of refraction which varies in response to an intensity of an electric field; and a reflecting face formed on an end face of said electro-optic material, which reflects said beam of radiation penetrating said electro-optic material from said base part and incident on said reflecting face, wherein said beam of radiation has a predetermined thickness and the size of said reflecting face is such that a substantially entire area of said reflecting face is irradiated by said beam of radiation having said predetermined thickness, and wherein said beam of radiation is a radiation focused by an optical system including an objective lens having a numerical aperture, NA, and the size of said reflecting face is such that said substantially entire area of said reflecting face is enclosable by a circle having a diameter approximately equal to a theoretical minimum beam diameter, (2λ
)/(π
NA), wherein λ
denotes a wave length of said beam of radiation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An E-O probe for measuring a voltage by applying a beam of radiation, comprising:
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a base part which is penetrated by said beam of radiation; an electro-optic material which is attached to an end face of said base part, having an index of refraction which varies in response to an intensity of an electric field; and a reflecting face formed on an end face of said electro-optic material, which reflects said beam of radiation penetrating said electro-optic material from said base part and incident on said reflecting face, wherein said beam of radiation has a predetermined thickness and the size of said reflecting face is such that a substantially entire area of said reflecting face is irradiated by said beam of radiation having said predetermined thickness, wherein said end face of said electro-optic material is substantially flat and extends across a larger area than said reflecting face, said reflecting area being located on said end face of said electro-optic material, and wherein said beam of radiation is a radiation focused by an optical system including an objective lens having a numerical aperture, NA, and the size of said reflecting face is such that said substantially entire area of said reflecting face is enclosable by a circle having a diameter approximately equal to a theoretical minimum beam diameter, (2λ
)/(π
NA), wherein λ
denotes a wave length of said beam of radiation. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification