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. 2020 Mar 13;6(11):eaaz8065. doi: 10.1126/sciadv.aaz8065

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Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 6 — The idler angular density Γ(θ_i) corresponding to collinear signal angles is plotted as a function of the idler angle inside the PPLN crystal θ_i for three different pump radii.