Space and time variables in optics and holography: recent experimental aspects

Viénot, Jean-Charles; Goedgebuer, J.-P.; Lacourt, A.

doi:10.1364/ao.16.000454

Cited by 34 publications

(6 citation statements)

References 2 publications

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“…Spectral modulated interference fringes are observed for a two-beam interferometer excited by a broadband light source with a subsequent spectrometer [1,2]. Such fringes in a simplest consideration are similar to those that are obtained in an unbalanced two-beam interferometer illuminated by a 3 Author to whom any correspondence should be addressed.…”

Section: Introductionsupporting

confidence: 55%

Evaluation of spectral modulated interferograms using a Fourier transform and the iterative phase-locked loop method

Gurov¹,

Hlubina

Chugunov³

2002

Meas. Sci. Technol.

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Spectral modulated interference fringes are observed in the form of the periodical modulation of a broadband spectrum at the output of an interferometer provided with a subsequent spectrometer. The group optical path difference of interfering light waves corresponding to the distance from the surface to be measured is characterized by the spectral fringe phase function. To recover the phase functions, a standard, Fourier-transform method, or parametric methods like a phase-locked loop (PLL) method, can be used. In the former case, the Fourier spectrum in the wavelength domain is computed and filtered out to obtain the reference spectrum and the overall phase information using a phase-unwrapping algorithm. In the latter case, the fringe phase deviations are traced dynamically in the independent variable domain, i.e. in the wavelength domain when the PLL method is applied to spectral interferometry. The PLL method was used to demodulate spectral fringes iteratively. A spectral fringe signal with a priori unknown carrier fringe frequency is considered and at the first iteration step a fringe phase equal to zero is supposed. The second iteration takes the demodulated phase found from the first iteration etc. As a result, the unwrapped phase function of the spectral fringes is found.

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Section: Introductionsupporting

confidence: 55%

Evaluation of spectral modulated interferograms using a Fourier transform and the iterative phase-locked loop method

Gurov¹,

Hlubina

Chugunov³

2002

Meas. Sci. Technol.

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“…Indeed, the first attempt to image biological samples with this technique is due to Fercher [29]. The underlying white light interferometric technique has in fact been well known since 1973 [30,31]. Spectral interferometry is actually also used in different fields of optical characterization and especially in pulse characterization [3,32,33].…”

Section: Fdoctmentioning

confidence: 99%

Scan-free optical correlation techniques: history and applications to optical coherence tomography

Froehly¹,

Leitgeb²

2010

J. Opt.

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In parallel with progress in generating ultrafast pulse sources and characterization techniques, optical time correlation techniques have seen tremendous development over many years and paved the way for novel applications in non-destructive and high resolution 'optical coherence tomography' (OCT) imaging. Amongst the known correlation techniques, the scan-free approach presents the advantage of single shot detection and real-time acquisition for pulse measurements, but this is not generally considered and applied for OCT imaging. The aim of this paper is to review the scan-free correlation method, analyze its performance and extended features and discuss its application to OCT.

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“…)= G0(R;X)+ Gl(R;X)+2GO(R;2)Gl(R;7)cos[(2rtIX)z\M(R;2)], (1) where G0(R; X) and G1(R; 2) are contributions ofboth beams to the resultant spectral power density G(R; ?) and M(R; X)…”

Section: Forming Of the Spectral Modulated Interferogrammentioning

confidence: 99%

Mensuration of the spectral modulated interferograms by the iterative phase-locked loop method

Gurov¹,

Hlubina

Chugunov³

2002

SPIE Proceedings

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Spectral modulated interference fringes are observed in the form of the periodical modulation of broadband spectrum at the output of interferometer provided with a subsequent spectrometer. Group optical path difference of interfering light waves corresponding to the distance from the surface to be measured is characterized by the phase function or fringe frequency of the spectral modulated interferogram. The phase locked loop (PLL) method was used to demodulate spectral fringes. It is supposed a priori unknown carrier fringe frequency, and PLL technique is realized in iterative mode to calculate full fringe phase. At the first iteration step the fringe phase equal to zero is supposed. The second iteration takes the demodulated phase found from the first iteration, etc. As a result, the phase function of the spectral fringes is found. Method was verified experimentally with application to the analysis of the spectral modulated interferograms inherent in Michelson interferometer excited by a low-coherent source

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Space and time variables in optics and holography: recent experimental aspects

Cited by 34 publications

References 2 publications

Evaluation of spectral modulated interferograms using a Fourier transform and the iterative phase-locked loop method

Evaluation of spectral modulated interferograms using a Fourier transform and the iterative phase-locked loop method

Scan-free optical correlation techniques: history and applications to optical coherence tomography

Mensuration of the spectral modulated interferograms by the iterative phase-locked loop method

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