Minimization of geometric-beam broadening in a grating-based time-domain delay line for optical coherence tomography application
JOSA A, Vol. 24, Issue 12, pp. 3808-3818 (2007)
http://dx.doi.org/10.1364/JOSAA.24.003808
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Abstract
This paper discusses a dispersion effect in a grating-based time-domain delay line that is different from the second- or higher-order dispersion in a grating-based Fourier-domain delay line. When the lateral broadening of the beam profile after grating dispersion exceeds the collection aperture of the reference fiber, the peripheral spectrum is decoupled by the fiber. The loss of reference spectral bandwidth by this geometric-beam broadening thus degrades the axial resolution. The polarizing-beam reflector used in the Fourier-domain delay line for suppression of lateral beam walk-off is implemented in this grating-based time-domain delay line to minimize geometric-beam broadening. Theoretical analysis and experiments are given to validate the axial resolution improvement after geometric-beam broadening is minimized. In vitro and in vivo imaging results are presented to demonstrate the improvement. It is also shown that geometric-beam broadening may exist in other optical coherence tomography reference arm configurations.
© 2007 Optical Society of America
OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(080.2740) Geometric optics : Geometric optical design
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(170.4500) Medical optics and biotechnology : Optical coherence tomography
ToC Category:
Medical Optics and Biotechnology
History
Original Manuscript: June 14, 2007
Revised Manuscript: October 14, 2007
Manuscript Accepted: October 19, 2007
Published: November 28, 2007
Virtual Issues
Vol. 3, Iss. 1 Virtual Journal for Biomedical Optics
Citation
Zhen Jiang, Quing Zhu, and Daqing Piao, "Minimization of geometric-beam broadening in a grating-based time-domain delay line for optical coherence tomography application," J. Opt. Soc. Am. A 24, 3808-3818 (2007)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=josaa-24-12-3808
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