| Simultaneous wavenumber measurement and coherence detection using temporal phase unwrapping. | |
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MedLine Citation:
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PMID: 22330287 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Wavelength scanning interferometry and swept-source optical coherence tomography require accurate measurement of time-varying laser wavenumber changes. We describe here a method based on recording interferograms of multiple wedges to provide simultaneously high wavenumber resolution and immunity to the ambiguities caused by large wavenumber jumps. All the data required to compute a wavenumber shift are provided in a single image, thereby allowing dynamic wavenumber monitoring. In addition, loss of coherence of the laser light is detected automatically. The paper gives details of the analysis algorithms that are based on phase detection by a two-dimensional Fourier transform method followed by temporal phase unwrapping and correction for optical dispersion in the wedges. A simple but robust method to determine the wedge thicknesses, which allows the use of low-cost optical components, is also described. The method is illustrated with experimental data from a Ti:sapphire tunable laser, including independent wavenumber measurements with a commercial wavemeter. A root mean square (rms) difference in measured wavenumber shift between the two of ∼4 m<sup>-1</sup> has been achieved, equivalent to an rms wavelength shift error of ∼0.4 pm. |
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Authors:
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A Davila; J M Huntley; C Pallikarakis; P D Ruiz; J M Coupland |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Applied optics Volume: 51 ISSN: 1539-4522 ISO Abbreviation: Appl Opt Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-02-14 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0247660 Medline TA: Appl Opt Country: United States |
Other Details:
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Languages: eng Pagination: 558-67 Citation Subset: IM |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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