Articles from Lei Xu

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   Development of a non-uniform discrete Fourier transform based high speed spectral domain optical coherence tomography system

   Transmissive RSOD for balance-detection-based OCT

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1. Transmissive RSOD for balance-detection-based OCT

   Explore Article SPIE Digital Library (Oct 28 2009)

   This paper presents a transmissive rapid scanning optical delay line (RSOD) for balance detection based optical coherence tomography (OCT). This transmissive RSOD, consisting of a reflective blazed grating, a Fourier lens, a fast-scanning galvo-mirror, a right-angle prism and a mirror, functions for phase modulation, axial scanning and dispersion compensation in OCT just as a reflective RSOD. The developed transmissive RSOD is implemented in OCT for balance detection. Comparison study indicates that improved quality of imaging is archived by the transmissive RSOD based OCT, in contrast to that by a conventional reflective RSOD based OCT. (Read Full Article)
   

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2. Development of a non-uniform discrete Fourier transform based high speed spectral domain optical coherence tomography system

   Explore Article opticsinfobase.org (Jul 2 2009)

   We develop a high speed spectral domain optical coherence tomography (SD-OCT) system based on a custom-built spectrometer and non-uniform discrete Fourier transform (NDFT) to realize minimized depth dependent sensitivity fall-off. After precise spectral calibration of the spectrometer, NDFT of the acquired spectral data is adopted for image reconstruction. The spectrometer is able to measure a wavelength range of about 138nm with a spectral resolution of 0.0674nm at central wavelength of 835nm, corresponding to an axial imaging range of 2.56mm in air. Zemax simulations and sensitivity fall-off measurements under two alignment states of the spectrometer are given. Both theoretical simulations and ... (Read Full Article)
   

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