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Proceedings Paper

Full-field swept-source optical coherence tomography with Gaussian spectral shaping
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Paper Abstract

A swept source system was realized in the wavelength range of 810-875 nm with the combination of a broad-band superluminescent diode (SLD) and an acousto-optic tunable filter (AOTF) as a frequency-tuning device. SLD has two spectral centers at 820 nm and 845 nm with spectral bandwidth (FWHM) of around 40 nm. Gaussian spectral shaping was performed onto the original SLD spectrum while reconstructing OCT images for various test samples such as onion slice and fingerprint impression taken on a glass substrate. As a pulse can be considered a Gaussian distribution of frequencies, spectral shaping yields sharper Fourier peaks. Application of Gaussian spectrum facilitates in precisely locating the reflective boundaries within the sample that results in improved OCT images.

Paper Details

Date Published: 3 October 2008
PDF: 8 pages
Proc. SPIE 7155, Ninth International Symposium on Laser Metrology, 71551F (3 October 2008); doi: 10.1117/12.814551
Show Author Affiliations
Satish Kumar Dubey, Indian Institute of Technology Delhi (India)
Central Scientific Instruments Organisation (India)
Gyanendra Sheoran, Indian Institute of Technology Delhi (India)
Tulsi Anna, Indian Institute of Technology Delhi (India)
Arun Anand, Institute for Plasma Research (India)
Dalip Singh Mehta, Indian Institute of Technology Delhi (India)
Chandra Shakher, Indian Institute of Technology Delhi (India)


Published in SPIE Proceedings Vol. 7155:
Ninth International Symposium on Laser Metrology
Chenggen Quan; Anand Asundi, Editor(s)

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