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Proceedings Paper

Ultrafast parallel coherence gating for an adaptive optics retina camera
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Paper Abstract

We have constructed an en face coherence gated camera for optically sectioning the in vivo human retina. Coherence gating is generated by a free-space Michelson interferometer employing a superluminescent diode for illuminating the retinal tissue; voice coil and piezo-electric translators for controlling the optical path length of the reference channel; and a scientific-grade CCD camera for recording 2-D retinal interferograms. A conventional 1-D OCT is incorporated for tracking the axial motion of the retina and controlling the gating position. En face slices of test objects and retinal tissue were obtained using a four-step (λ/4) phase shift method. Ultrafast acquisition of four interferograms in less than 7 milliseconds has been achieved to mitigate eye motion blur. A 5-step reconstruction algorithm that is more robust to phase shift error and noise was compared to the 4-step. The axial width of the point spread function and the sensitivity of the camera were measured near 10µm and 76 dB, respectively, which is substantially better than current flood-illuminated and confocal scanning laser ophthalmoscopes equipped with adaptive optics.

Paper Details

Date Published: 8 July 2003
PDF: 8 pages
Proc. SPIE 4956, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine VII, (8 July 2003); doi: 10.1117/12.477632
Show Author Affiliations
Junle Qu, Indiana Univ. (United States)
Ravi S. Jonnal, Indiana Univ. (United States)
Donald T. Miller, Indiana Univ. (United States)

Published in SPIE Proceedings Vol. 4956:
Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine VII
Valery V. Tuchin; Joseph A. Izatt; James G. Fujimoto, Editor(s)

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