Method and an apparatus for shape measurement, and a frequency comb light generator
First Claim
1. A method for shape measurement comprising the steps of:
- generating a frequency COMB light by inputting a laser light from a laser light source into an optical fiber which compensates a change in the polarization condition and maintains the polarization, and has a first mirror and a second mirror which are positioned with a resonant distance in between and modulating the laser light transmitting between the first mirror and the second mirror using a modulation electrode; and
measuring a shape of an measured object using an optical interferometer by inputting the frequency COMB light into the optical interferometer for distance measurement, wherein further comprising the step of;
regulating an observation depth by varying the modulation signal applied to the modulation electrode so that a frequency pitch of frequency COMBs which constitutes the frequency COMB light is varied.
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Accused Products
Abstract
A method and an apparatus for shape measurement that is able to observe the deep portion under a skin with high spatial resolution by using a frequency COMB light generator is provided. A frequency COMB light generator for generating multiple frequency COMBs with variable frequency pitch at high operation stability is provided.
This apparatus for shape measurement comprises a frequency COMB light generator and an optical interferometer for measuring the distance. The frequency COMB light generator includes a laser light source 11, an optical resonator 13, a COMB pitch regulator 14 and an output port OUT. The optical resonator 13 includes an optical modulator 131, a first mirror M11, an optical fiber F13 which is drawn out from alight waveguide of the optical modulator. The COMB pitch regulator 14 is a modulation signal generator for varying the modulation signal. The optical fiber F13 is equipped with an apparatus (Faraday rotation mirror) for compensating a change in the polarization condition.
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Citations
12 Claims
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1. A method for shape measurement comprising the steps of:
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generating a frequency COMB light by inputting a laser light from a laser light source into an optical fiber which compensates a change in the polarization condition and maintains the polarization, and has a first mirror and a second mirror which are positioned with a resonant distance in between and modulating the laser light transmitting between the first mirror and the second mirror using a modulation electrode; and measuring a shape of an measured object using an optical interferometer by inputting the frequency COMB light into the optical interferometer for distance measurement, wherein further comprising the step of; regulating an observation depth by varying the modulation signal applied to the modulation electrode so that a frequency pitch of frequency COMBs which constitutes the frequency COMB light is varied. - View Dependent Claims (2, 3)
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4. An apparatus for shape measurement comprising:
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a frequency comb light generator including; a laser light source; an optical resonator for generating a frequency COMB light from the laser light which is output by the laser light source; a COMB pitch regulator for varying the frequency pitch of a frequency COMBs which constitutes the frequency COMB light; and an output port for outputting a resonant output from the optical resonator; and an optical interferometer for measuring the distance which uses the frequency COMB light generator as a light source, wherein the optical resonator includes; an optical modulator for modulating the light by a modulation electrode; a first mirror which is positioned at one end of a light waveguide of the optical modulator; an optical fiber which is drawn out form the other end of the waveguide of the optical modulator; a second mirror which is positioned at the end of optical fiber, the COMB pitch regulator is a modulation signal generator for varying the modulation signal which is fed to the modulation electrode, and the second mirror is an apparatus for compensating the change in the polarization condition, or the optical fiber is a polarization maintaining fiber. - View Dependent Claims (5, 6, 7, 8)
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9. A frequency COMB light generator comprising:
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a laser light source; an optical resonator for generating a frequency COMB light from the laser light which is output by the laser light source; a COMB pitch regulator for varying the frequency pitch of a frequency COMBs which constitutes the frequency COMB light; and an output port for outputting a resonant output from the optical resonator; and wherein the laser light which is output from the laser light source is modulated so that the frequency has a predetermined width, the optical resonator includes; an optical modulator for modulating the light by a modulation electrode; a first mirror which is positioned at one end of a light waveguide of the optical modulator; an optical fiber which is drawn out form the other end of the light waveguide of the optical modulator; a second mirror which is positioned at the end of optical fiber, the COMB pitch regulator is a modulation signal generator for varying the modulation signal which is fed to the modulation electrode, and the second mirror is an apparatus for compensating the change in the polarization condition, or the optical fiber is a polarization maintaining fiber. - View Dependent Claims (10, 11, 12)
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Specification