Affiliation:
1. Center for Biomolecular Nanotechnologies
2. Università del Salento
3. RAISE Ecosystem
4. University of Padova
5. Sorbonne University
Abstract
The use of wavefront shaping has found extensive application to develop ultra-thin endoscopic techniques based on multimode optical fibers (MMF), leveraging on the ability to control modal interference at the fiber’s distal end. Although several techniques have been developed to achieve MMF-based laser-scanning imaging, the use of short laser pulses is still a challenging application. This is due to the intrinsic delay and temporal broadening introduced by the fiber itself, which requires additional compensation optics on the reference beam during the calibration procedure. Here we combine the use of a supercontinuum laser and an internal reference-based wavefront shaping system to produce focused spot scanning in multiple planes at the output of a step-index multimode fiber, without the requirement of a delay line or pulse pre-compensation. We benchmarked the performances of internal vs external reference during calibration, finding that the use of an internal reference grants better focusing efficiency. The system was characterized at different wavelengths, showcasing the wavelength resiliency of the different parameters. Lastly, the scanning of focal planes beyond the fiber facet was achieved by exploiting the chromato-axial memory effect.
Funder
H2020 Marie Skłodowska-Curie Actions
Robotics and AI for Socio-economic Empowerment
H2020 LEIT Information and Communication Technologies
H2020 Future and Emerging Technologies
European Research Council
Cited by
1 articles.
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