• Current Optics and Photonics
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• v.3 no.1
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• pp.16-21
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• 2019

We present a broad-bandwidth comb-spacing-swept source (CSWS) based on a differential polarization delay line (DPDL) for interferometric three-dimensional (3D) imaging. The comb spacing of the CSWS is repeatedly swept by the tunable DPDL in the multiwavelength source to provide depth-scanning optical coherence tomography (OCT). As the polarization differential delay of the DPDL is tuned from 5 to 15 ps, the comb spacing along the wavelength continuously varies from 1.6 to 0.53 nm, respectively. The wavelength range of various semiconductor optical amplifiers and the cavity feedback ratio of the tunable fiber coupler are experimentally selected to obtain optimal conditions for a broader 3-dB bandwidth of the multiwavelength spectrum and thus provide a higher axial resolution of $35{\mu}m$ in interferometric OCT imaging. The proposed CSWS-OCT has a simple imaging interferometer configuration without reference-path scanning and a simple imaging process without the complex Fourier transform. 3D surface images of a via-hole structure on a printed circuit board and the top surface of a coin were acquired.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2007.06a
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• pp.9-10
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• 2007

• KLA journal
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• v.14 no.2
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• pp.17-21
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• 1973

(기자 주) 이 글은 랭캐스터(Lancaster, F.W.)교수가 미국 매리랜드주 베데스다(Bethesda)dpdlTsms 웨스타트연구소(Westat Research, Inc.)에서 발표한 논문(The Cost-Effectiveness Analysis of Information System)으로서, 미국정보과학회지(Journal of American Society for Information Science) Vol. 22, No. 1(Jan-Feb 1971), p.12-27에 수록되어 있다. 랭캐스터교수는 현재 미국 일리노이 대학교 대학원에서 도서관학을 강의하고 있다.