Abstract
Wavefront shaping through a multi-core fiber (MCF) is turning into an attractive method for endoscopic imaging and optical cell-manipulation on a chip. However, the discrete distribution and the low number of cores induce pixelated phase modulation, becoming an obstacle for delivering complex light field distributions through MCFs. We demonstrate a novel phase retrieval algorithm named Core–Gerchberg–Saxton (Core-GS) employing the captured core distribution map to retrieve tailored modulation hologram for the targeted intensity distribution at the distal far-field. Complex light fields are reconstructed through MCFs with high fidelity up to 96.2%. Closed-loop control with experimental feedback denotes the capability of the Core-GS algorithm for precise intensity manipulation of the reconstructed light field. Core-GS provides a robust way for wavefront shaping through MCFs; it facilitates the MCF becoming a vital waveguide in endoscopic and lab-on-a-chip applications.
Highlights
Phase Distortion Compensation in a Multi-Core FiberA multi-core fiber (MCF) consists of about 10,000 single-mode cores with a diameter of 350 μm
Wavefront shaping through a multi-core fiber (MCF) is turning into an attractive method for endoscopic imaging and optical cell-manipulation on a chip
We propose a novel phase retrieval algorithm named Core–Gerchberg–Saxton (CoreGS) which is specialized for complex wavefront shaping through an MCF
Summary
A multi-core fiber (MCF) consists of about 10,000 single-mode cores with a diameter of 350 μm. The phase delay of each core is measured at the distal side using off-axis holography, and the conjugated phase is displayed on the SLM to precompensate for the phase distortion. Assuming the intensity distribution of the in-coupling light is homogeneous, the phase delay in the MCF is ∆φ( x, y), the light field at the distal facet can be expressed as. The phase delays of cores are compensated at the distal facet, and the compensated light field is. For complex wavefront shaping using SLMs, both the intensity and phase information at the target plane are required to reconstruct the desired light field. The standard deviation of the FWHM in 50 h is only 0.55%
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