Nonlinear imaging through a Fermat's golden spiral multicore fiber

Area of Science:

• Optics and Photonics
• Biomedical Imaging
• Fiber Optics

Background:

• Two-photon imaging offers high resolution but often requires complex optical setups.
• Multicore fibers provide a platform for parallel optical signal delivery and processing.
• Novel fiber designs are needed to overcome limitations in field of view and signal fidelity.

Purpose of the Study:

• To introduce a novel Fermat's golden spiral multicore fiber for advanced imaging applications.
• To optimize fiber parameters for enhanced imaging performance, including sidelobe levels and field of view.
• To demonstrate the practical utility of this fiber in lensless two-photon imaging.

Main Methods:

• Fabrication of a unique Fermat's golden spiral multicore fiber.
• Characterization of the fiber's optical properties: sidelobe levels, field of view, crosstalk, group delay, and mode density.
• Experimental demonstration of focal point generation and scanning using femtosecond pulses.
• Implementation of lensless two-photon imaging using the developed fiber.

Main Results:

• The novel fiber design achieved a sidelobe contrast of at least 10.9 dB.
• Optimized parameters led to improved field of view and reduced crosstalk.
• Successful generation and scanning of a focal point with femtosecond pulses were demonstrated.
• Lensless two-photon imaging was successfully performed through the multicore fiber.

Conclusions:

• The Fermat's golden spiral multicore fiber is a promising technology for lensless two-photon imaging.
• This fiber design offers significant advantages in optimizing imaging parameters.
• The experimental results validate the potential of this novel fiber for future imaging systems.