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. 2024 Jul 3;15(8):4425–4437. doi: 10.1364/BOE.525693

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© 2024 The Author(s)

https://creativecommons.org/licenses/by/4.0/

2334-2536/23/070880-08

Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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Fig. 3. — RL experimental setup from our previous study [15]. The pump light from a pulsed Nd:YAG laser is focused onto the sample. The back-scattered emission light is collected from the excitation spot with an angle of $45^{\circ}$ , and then guided by the optical fiber to a spectrograph. M: mirror; L: lens; NF: notch filter; NDF: neutral density filter.