Resumen: A method based on the photographic recording of the power distribution laterally diffused by cationic-network (CN) hydrogel waveguides is first checked against the well-established cut-back method and then used to determine the different contributions to optical power attenuation along the hydrogel-based waveguide. Absorption and scattering loss coefficients are determined for 450 nm, 532 nm and 633 nm excitation. The excellent optical loss values obtained (0.32–1.95 dB/cm), similar to others previously described, indicate their potential application as waveguides in different fields, including soft robotic and light-based therapies. Idioma: Inglés DOI: 10.3390/mi13122253 Año: 2022 Publicado en: Micromachines 13, 12 (2022), 2253 [9 pp.] ISSN: 2072-666X Factor impacto JCR: 3.4 (2022) Categ. JCR: CHEMISTRY, ANALYTICAL rank: 29 / 86 = 0.337 (2022) - Q2 - T2 Categ. JCR: INSTRUMENTS & INSTRUMENTATION rank: 25 / 63 = 0.397 (2022) - Q2 - T2 Categ. JCR: PHYSICS, APPLIED rank: 57 / 160 = 0.356 (2022) - Q2 - T2 Categ. JCR: NANOSCIENCE & NANOTECHNOLOGY rank: 68 / 107 = 0.636 (2022) - Q3 - T2 Factor impacto CITESCORE: 4.7 - Engineering (Q2)