Abstract
We present a powerful approach towards full understanding of laser light propagation through multimode optical fibres and control of the light at the fibre output. Transmission of light within a multimode fibre introduces randomization of laser beam amplitude, phase and polarization. We discuss the importance of each of these factors and introduce an experimental geometry allowing full analysis of the light transmission through the multimode fibre and subsequent beam-shaping using a single spatial light modulator. We show that using this approach one can generate an arbitrary output optical field within the accessible field of view and range of spatial frequencies given by fibre core diameter and numerical aperture, respectively, that contains over 80% of the total available power. We also show that this technology has applications in biophotonics. As an example, we demonstrate the manipulation of colloidal microparticles.
Highlights
The randomization of laser light in various media presents a substantial obstacle for the exploitation of photonics in many scientific disciplines including biology and medicine
An alternative approach allowing complex optimization, that is in both phase and amplitude, was introduced in 2010 [5] showing the first application of this technology in the field of optical manipulation where trapping through turbid media was demonstrated
In this paper we have introduced a powerful approach allowing complex quantification of light propagation through multimode optical fibres and its control using a spatial light modulator
Summary
The randomization of laser light in various media presents a substantial obstacle for the exploitation of photonics in many scientific disciplines including biology and medicine. An alternative approach allowing complex optimization, that is in both phase and amplitude, was introduced in 2010 [5] showing the first application of this technology in the field of optical manipulation where trapping through turbid media was demonstrated. In this paper we show that exploiting and advancing the method presented in [5] we can fully analyze the light transformation of an optical system containing a multimode optical fibre This analysis is between input modes represented in our case by considering sub-domains at the SLM plane and the output modes - optimally focused beams at the output fibre facet taking into account all of the parameters of the field i.e. the phase, amplitude and polarization distributions. We demonstrate the generation of an arbitrary intensity distribution at the fibre output and conclude with the experimental application of our method in the field of optical manipulation
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