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Technology

2022
APL Photonics

Two-photon, fiber-coupled, super-resolution microscope for biological imaging

Authors:

Heffernan, B. M., Riley, P. S., Supekar, O. D., Meyer, S. A., Restrepo, D., Siemens, M. E., ... & Gopinath, J. T.

Keywords:

Wave mechanics, Diffraction optics

Abstract:

Imaging sub-diffraction dynamics of neural nanostructures involved in behaviors such as learning and memory in a freely moving animal is not possible with existing techniques. Here, we present a solution in the form of a two-photon (2P), fiber-coupled, stimulated emission depletion microscope and demonstrate its capabilities by acquiring super-resolution imaging of mammalian cells. A polarization-maintaining fiber is used to transport both the 2P excitation light (915 nm) and the donut-shaped depletion beam (592 nm), which is constructed by adding two temporally incoherent and orthogonally polarized Hermite–Gaussian fiber modes. The fiber output is insensitive to bending or temperature changes and is the first demonstration toward deep tissue super-resolution imaging in awake behaving animals.

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