Structural and optical properties of Nd:YAB‑nanoparticle‑doped PDMS elastomers for random lasers
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2021
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We report the structural and optical properties of Nd:YAB (
NdxY1−x Al3(
BO3)4)-nanoparticle-doped
PDMS elastomer films for random lasing (RL) applications. Nanoparticles with Nd ratios of x = 0.2, 0.4,
0.6, 0.8, and 1.0 were prepared and then incorporated into the PDMS elastomer to control the optical
gain density and scattering center content over a wide range. The morphology and thermal stability
of the elastomer composites were studied. A systematic investigation of the lasing wavelength,
threshold, and linewidth of the laser was carried out by tailoring the concentration and optical gain
of the scattering centers. The minimum threshold and linewidth were found to be 0.13 mJ and 0.8 nm
for x = 1 and 0.8. Furthermore, we demonstrated that the RL intensity was easily tuned by controlling
the degree of mechanical stretching, with strain reaching up to 300%. A strong, repeatable lasing
spectrum over ~ 50 cycles of applied strain was observed, which demonstrates the high reproducibility
and robustness of the RL. In consideration for biomedical applications that require long-term RL
stability, we studied the intensity fluctuation of the RL emission, and confirmed that it followed
Lévy-like statistics. Our work highlights the importance of using rare-earth doped nanoparticles with
polymers for RL applications.
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HLIL, Antsar R. et al. Structural and optical properties of Nd:YAB-nanoparticle-doped PDMS elastomers for random lasers. Scientific Reports, London, v. 11, n. 1, p. e16803, 2021. DOI: 10.1038/s41598-021-95921-8. Disponível em: https://pubmed.ncbi.nlm.nih.gov/34413334/. Acesso em: 28 abr. 2023.