Frequency shifter and optical displacement measurement apparatus using the same
First Claim
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1. A frequency shifter for modulating a frequency of an incident light beam, said shifter comprising:
- an electro-optic crystal portion to be arranged at an incident position;
an electrode arranged on said electro-optic crystal portion;
voltage application means for applying a voltage to said electro-optic crystal portion via said electrode; and
means, arranged at least at a portion of said electro-optic crystal portion, for uniformizing a temperature of said electro-optic crystal portion, whereinsaid means for uniformizing the temperature is arranged over portions, of said electro-optic crystal portion, on which two light beams are respectively incident.
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Abstract
A frequency shifter for modulating the frequency of an incident light beam is disclosed. This frequency shifter includes an electro-optic crystal portion to be arranged at an incident position, an electrode arranged on the electro-optic crystal portion, a voltage application unit for applying a voltage to the electro-optic crystal portion via the electrode, and a unit which is arranged at least at a portion of the electro-optic crystal portion to uniformize the temperature of the electro-optic crystal portion.
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Citations
13 Claims
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1. A frequency shifter for modulating a frequency of an incident light beam, said shifter comprising:
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an electro-optic crystal portion to be arranged at an incident position; an electrode arranged on said electro-optic crystal portion; voltage application means for applying a voltage to said electro-optic crystal portion via said electrode; and means, arranged at least at a portion of said electro-optic crystal portion, for uniformizing a temperature of said electro-optic crystal portion, wherein said means for uniformizing the temperature is arranged over portions, of said electro-optic crystal portion, on which two light beams are respectively incident. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for optically detecting displacement information of an object, said apparatus comprising:
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light source means for emitting at least one light beam; a frequency shifter for modulating a frequency of at least one light beam emitted from said light source means, said frequency shifter including; i) an electro-optic crystal portion to be arranged at an incident position, ii) an electrode arranged on said electro-optic crystal portion, iii) voltage application means for applying a voltage to said electro-optic crystal portion via said electrode, and iv) means, arranged at least at a portion of said electro-optic crystal portion, for uniformizing a temperature of said electro-optic crystal portion; and a photodetecting portion for detecting light from the object irradiated with at least one light beam frequency-modulated by said frequency shifter, wherein said light source means emits two light beams, said frequency shifter causes the two light beams to be incident on said electro-optic crystal portion and modulates at least one of the two light beams, and said photodetecting portion detects light from the object irradiated with the two light beams. - View Dependent Claims (7)
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8. A frequency shifter for modulating a frequency of an incident light beam, said shifter comprising:
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an electro-optic crystal portion to be arranged at an incident position, said electro-optic crystal portion having two electro-optic crystals in areas through which two incident light beams are respectively transmitted, and said two electro-optic crystals having crystallographic axes arranged in opposite directions with respect to an axis perpendicular to a direction of arrangement of said two electro-optic crystals; an electrode arranged on said electro-optic crystal portion to apply voltages to said two electro-optic crystals in the same direction; and voltage application means for applying a voltage to said electro-optic crystal portion via said electrode. - View Dependent Claims (9)
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10. A frequency shifter for modulating a frequency of an incident light beam, said shifter comprising:
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an electro-optic crystal portion to be arranged at an incident position, said electro-optic crystal portion having two electro-optic crystals in areas through which two incident light beams are respectively transmitted, and said two electro-optic crystals having crystallographic axes arranged in opposite directions; an electrode arranged on said electro-optic crystal portion to apply voltages to said two electro-optic crystals in the same direction; voltage application means for applying a voltage to said electro-optic crystal portion via said electrode; and means, arranged at least at a portion of said electro-optic crystal portion, for uniformizing a temperature of said electro-optic crystal portion. - View Dependent Claims (11)
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12. An apparatus for optically detecting displacement information of an object, said apparatus comprising:
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light source means for emitting at least one light beam; a frequency shifter for modulating a frequency of at least one light beam emitted from said light source means, said frequency shifter including; i) an electro-optic crystal portion to be arranged at an incident position, said electro-optic crystal portion having two electro-optic crystals in areas through which two incident light beams are respectively transmitted, and said two electro-optic crystals having crystallographic axes arranged in opposite directions with respect to an axis perpendicular to a direction of arrangement of said two electro-optic crystals, ii) an electrode arranged on said electro-optic crystal portion to apply voltages to said two electro-optic crystals in the same direction, and iii) voltage application means for applying a voltage to said electro-optic crystal portion via said electrode; and a photodetecting portion for detecting light from the object irradiated with at least one light beam frequency-modulated by said frequency shifter, thereby detecting displacement information of the object. - View Dependent Claims (13)
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Specification