Patent ID: 9625350
Date: 2017-04-18
CPC Classifications: G01M

Claim:
1. A refractive index distribution measuring method comprising: a phase difference measuring step of dividing light emitted from a light source into reference light and test light and causing the reference light to interfere with the test light, which test light has entered a test object and has passed through the test object, to measure a phase difference between the reference light and the test light; a wavefront aberration measuring step of measuring a wavefront aberration of the test light; and a calculation step of calculating a refractive index distribution of the test object based on the phase difference and the wavefront aberration, wherein the phase difference measuring step includes measuring a first phase difference for a first wavelength and a second phase difference for a second wavelength different from the first wavelength, wherein the wavefront aberration measuring step includes measuring a first wavefront aberration for the first wavelength and a second wavefront aberration for the second wavelength, and wherein the calculation step includes calculating a phase-difference difference amount, which is a difference between the first phase difference and the second phase difference, calculating a wavefront aberration difference amount, which is a difference between the first wavefront aberration and the second wavefront aberration, and calculating the refractive index distribution of the test object based on the phase-difference difference amount and the wavefront aberration difference amount.