Method And An Apparatus For Shape Measurement, And A Frequency Comb Light Generator

摘要

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 M 11 , an optical fiber F 13 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 F 13 is equipped with an apparatus (Faraday rotation mirror) for compensating a change in the polarization condition.