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. Author manuscript; available in PMC: 2020 Mar 1.
Published in final edited form as: J Biophotonics. 2018 Nov 13;12(3):e201800205. doi: 10.1002/jbio.201800205

Figure 3.

Figure 3

Astigmatism performance within depth of field. (A) Logarithm of the ASTI defined as the ratio of the spot size in the azimuthal direction to that in the longitudinal direction. Inset: Airy disk and the worst spot shape indicated by a green arrow according to ZEMAX simulations. (B) The worst OCT imaging beam spot shape measured by a CCD camera within the DOF range which was about 50 μm away from the focal plane. (C) Imaging spot shape in the focal plane which was about 300 μm away from the capsule surface.