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. 2022 Dec 1;9(4):045009. doi: 10.1117/1.NPh.9.4.045009

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© 2022 The Authors

Published by SPIE under a Creative Commons Attribution 4.0 International License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Fig. 2 — Two-photon optical characterizations of the GRINtrode imaging systems at 920 nm. $50 - μ m$ grid slide calibration target used for FOV measurements using the GRIN lens imaging system A (a1) and imaging system B (b1). $0.5 - μ m$ fluorescent bead slide sample used for lateral and axial FWHM measurements using the GRIN lens imaging system A (a2) and imaging system B (b2).