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. 2022 Aug 19;11:256. doi: 10.1038/s41377-022-00946-x

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Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — The acceptor concentration-dependent kinetics of ⁴S_3/2 level (left column: a–c) and ⁴F_9/2 (right column d–f) of Er³⁺ derived with DRE modeling for the three excitation schemes: TTL triggered 4 ms 980 nm CW laser diode pulse (top row, a, d), ca. 10 ns 980 nm OPO laser pulse (middle row, b, e) and ca. 10 ns 520 nm OPO laser pulse (bottom row, c, f). The acceptor concentration increases from the darkest (no acceptor present) to the lightest color (highest concentrations; details of the model in SI)