The refractive index profiles in Fig. 2 were incorrect. The proper designs are presented here with additional comments.

©2008 Optical Society of America

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  1. X. Cheng, B Fan, J. A. Dobrowolski, L. Wang, and Z. Wang, “Gradient-index optical filter synthesis with controllable and predictable refractive index profiles,” Opt. Express 16, 2315–2321 (2008).
    [Crossref] [PubMed]
  2. The authors are grateful to Dr. P. Verly for spotting the mistake and checking the final designs.

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Fig. 2.
Fig. 2. Refractive-index profiles and reflectance spectra for a house-like reflector calculated with (a) a zero phase, (b) a SWIFT-phase without using some portion of the long-wavelength tower in phase calculation, (c) a SWIFT-phase combined with iterations. The red dashed line is the design target and the black lines are the synthesized spectra.