Abstract
Flexible optical fibres, used in conventional medical endoscopy and industrial inspection, scramble phase and polarisation information, restricting users to amplitude-only imaging. Here, we exploit the near-diagonality of the multi-core fibre (MCF) transmission matrix in a parallelised fibre characterisation architecture, enabling accurate imaging of quantitative phase (error rad) and polarisation-resolved (errors %) properties. We first demonstrate accurate recovery of optical amplitude and phase in two polarisations through the MCF by measuring and inverting the transmission matrix, and then present a robust Bayesian inference approach to resolving 5 polarimetric properties of samples. Our method produces high-resolution (m amplitude, phase; m polarimetric) full-field images at working distances up to 1mm over a field-of-view up to 750×750μm2 using an MCF with potential for flexible operation. We demonstrate the potential of using quantitative phase for computational image focusing and polarisation-resolved properties in imaging birefringence.
Highlights
Imaging through optical fibres is performed in a range of applications, including biomedical endoscopy and industrial inspection, which exploit their small diameter and high flexibility
Single-mode fibres (SMFs) with distal scanning [5], multi-mode fibres (MMFs) [6,7,8], and fused multi-core fibres (MCF) comprising many thousands of light-guiding cores [9] have all been investigated for imaging applications
Simple test patterns were displayed on SLM1 for imaging (Fig. 6), which demonstrated successful recovery of amplitude, phase and polarisation information by multiplying the raw complex image with the inverse of the retrieved transmission matrix (TM)
Summary
Imaging through optical fibres is performed in a range of applications, including biomedical endoscopy and industrial inspection, which exploit their small diameter (typically
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