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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 2.

Figure 2

Chromatic characteristics. (A) Longitudinal focal shift of two combined achromatic lenses over a full 200 nm bandwidth (blue curve), and the longitudinal focal shift after adding the diffractive lens to the two achromats (red curve). (B) Normalized spectra backscattered by a mirror placed at different positions along the imaging depth, which remained nearly unchanged, indicating the superb achromatic performance of the compound diffractive optics. (C) A representative axial point spread function from the capsule measured in air.