Abstract
Fourier transform white-light interferometry recovers the optical path difference of an interferometer by measuring the phase change caused by scanning wavelength. However, the optical spectrum, obtained by wavelength scanning method (-method), contains a chirp in period. The chirp would induce deviation and decrease the measurement accuracy. An improved method, the wavenumber scanning method (-method), is proposed and experimentally demonstrated, in which there is no chirp in the optical spectrum. The measurement results using the -method and the -method are compared experimentally. The experimental results show that the standard deviation of the measurement results decreases from 0.015 to 0.004 μm, when an extrinsic Fabry–Perot interferometer with a cavity length of 387 μm is interrogated.
© 2012 Optical Society of America
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