title: Improvement of the depth resolution in depth-resolved wavenumber-scanning interferometry using multiple uncorrelated wavenumber bands.
abstract: In this article, we provide a method to improve the depth resolution of wide-field depth-resolved wavenumber-scanning interferometry (DRWSI), because its depth resolution is limited by the range of the wavenumber scanning and mode hopping of the light source. An optical wedge is put into the optical path to measure the series of the wavenumber on time using a 2D spatial Fourier transform (FT) of the interferograms. Those uncorrelated multiple bands of the wavenumbers due to mode hopping of the diode laser can be synthesized into one band, to enlarge the range of the wavenumber scanning. A random-sampling FT is put forward to evaluate the distribution of frequencies and phases of the multiple surfaces measured. The benefit is that the depth resolution of the DRWSI is enhanced significantly with a higher signal-to-noise ratio. Because of its simplicity and practicability, this method broadens the way to employing multiple different lasers or lasers with mode hopping as the light sources in the DRWSI.
authors.affiliation: Faculty of Automation, Guangdong University of Technology, Guangzhou, Guangdong, China.
authors.forename: Jinxiong
authors.initials: J
authors.lastname: Xu
authors.forename: Yufei
authors.initials: Y
authors.lastname: Liu
authors.forename: Bo
authors.initials: B
authors.lastname: Dong
authors.forename: Yulei
authors.initials: Y
authors.lastname: Bai
authors.forename: Linlin
authors.initials: L
authors.lastname: Hu
authors.forename: Cong
authors.initials: C
authors.lastname: Shi
authors.forename: Zhuoming
authors.initials: Z
authors.lastname: Xu
authors.forename: Yanzhou
authors.initials: Y
authors.lastname: Zhou