2013
DOI: 10.1364/ao.52.004890
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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 … Show more

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Cited by 14 publications
(11 citation statements)
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“…The first two surfaces S 1 and S 2 are from an optical wedge. These are used as the reference planes in the Michelson interferometer as well as for monitoring the light wavenumber of the diode laser [6]. S 3 ; …; S M are the surfaces measured.…”
Section: Optical Setupmentioning
confidence: 99%
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“…The first two surfaces S 1 and S 2 are from an optical wedge. These are used as the reference planes in the Michelson interferometer as well as for monitoring the light wavenumber of the diode laser [6]. S 3 ; …; S M are the surfaces measured.…”
Section: Optical Setupmentioning
confidence: 99%
“…The Fourier transform (FT) is widely used in optical depthresolved interferometry applications such as wavelengthscanning interferometry (WSI), swept source interferometry, and spectral OCT [1][2][3][4][5][6][7]. The main drawback of these methods is that their profile depth resolution is limited by the width of the sampling window.…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…The series of the fringe patterns photographed by the CCD camera can be expressed as I(),,xyk=truetrue∑p=1Mtruetrue∑q=1MIp(),xyIq(),xynormalcos[]2normalπΛpq(),xyπk+φpq0(),xy,where ( x , y ) represents spatial coordinates; I p and I q are reflective light intensity from surfaces p and q , respectively; M is the number of the surfaces of the sample and the optical wedge; φ pq 0 is the initial interference phase between surfaces p and q ; Λ pq is the optical path difference between surfaces p and q ; and the wavenumber k = 2π/ λ , where λ is the light wavelength.…”
Section: Theorymentioning
confidence: 99%
“…Fourier transform of the fringe patterns I ( x , y , k ) in the k space can be written as leftItrue˜xyf=FIxykFwkFtruetrue∑n=1Nδ[]kk()n=n=1N+Ixykwkδkknexpj2πfkdk,where F denotes the Fourier transform; f is the frequency in the Fourier space k ; w is a window function (Hanning window); truetrue∑n=1Nδ[]kk()n is the sampling function; k ( n ) is the value of the wavenumber as the CCD camera takes the n ‐th image; N is the total number of the images, which are photographed by the CCD camera. According to the property of δ function, Equation can be rewritten as trueI˜(),,xyf=truetrue∑n=1NI[]x,y,k()nw[]k()nnormalexp[]j2normalπfk()n,where k ( n ) is non‐linear and randomly sampled.…”
Section: Theorymentioning
confidence: 99%