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Two-photon retinal theranostics by adaptive compact laser source

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Abstract

To avoid a devastating effect of eye vision impairment on the information flow from the eye to our brain, enormous effort is being put during the last decades into the development of more sensitive diagnostics and more efficient therapies of retinal tissue. While morphology can be impressively imaged by optical coherence tomography, molecular-associated pathology information can be provided almost exclusively by auto-fluorescence-based methods. Among the latter, the recently developed fluorescence lifetime imaging ophthalmoscopy (FLIO) has the potential to provide both structural information and interacting pictures at the same time. The requirements for FLIO laser sources are almost orthogonal to the laser sources used in phototherapy that is expected to follow up the FLIO diagnostics. To make theranostics more effective and cheaper, the complete system would need to couple at least the modalities of low-power high-repetition-rate FLIO and precision high-pulse energy-adjustable repetition rate phototherapy. In addition, the intermediate-power high repetition rate for two-photon excitation would also be desired to increase the depth resolution. In our work, compact fiber-laser based on high-speed gain-switched laser diode has been shown to achieve adaptable/independently tunable repetition rate and energy per pulse allowing coupled fluorescence lifetime diagnostics via two-photon excitation and phototherapy via laser-induced photodisruption on a local molecular environment in a complex ex vivo retinal tissue.

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Acknowledgements

The work was primarily carried out in the framework of the GOSTOP program, which is partially financed by the Republic of Slovenia – Ministry of Education, Science and Sport, and the European Union – European Regional Development Fund, as well as in the framework of L7-7561 Project, which is financed by the Slovenian Research Agency ARRS. In addition, this work was also partially supported by other projects of the Slovenian Research Agency ARRS (L2-9240, L2-9254, P2-0270, P1-0060). We would like to acknowledge also the group of prof. B. Drnovšek Olup on the Department of Ophthalmology of the University Medical Clinical Centre Ljubljana to provide us the access to the ex vivo samples of the retinal tissue.

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Authors and Affiliations

  1. Ion Beam Center, Helmholz Zentrum Dresden Rossendorf (HZDR), Bautzner Landstraße 400, 01328, Dresden, Germany

    Rok Podlipec

  2. Jožef Stefan Institute, Jamova cesta 39, 1000, Ljubljana, Slovenia

    Rok Podlipec & Janez Štrancar

  3. Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, 1000, Ljubljana, Slovenia

    Jaka Mur, Jaka Petelin & Rok Petkovšek

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Podlipec, R., Mur, J., Petelin, J. et al. Two-photon retinal theranostics by adaptive compact laser source. Appl. Phys. A 126, 405 (2020). https://doi.org/10.1007/s00339-020-03587-2

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