A light-in-flight single-pixel camera for use in the visible and short-wave infrared

Johnson, Steven D.; Phillips, David B.; Ma, Zelin; Ramachandran, Siddharth; Padgett, Miles J.

doi:10.1364/oe.27.009829

Cited by 18 publications

(7 citation statements)

References 35 publications

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“…The ability to transmit high data-rates through multimode optical fibers makes this research important to understand mode propagation. Using a single-pixel camera high temporal resolution measurements of the modes have been produced demonstrating an order of magnitude improvement in temporal resolution, lower signal-to-noise and shorter acquisition times than previous measurements [15]. The previous work used single-photon counting detectors requiring longer acquisition time to produce an image, analogue detectors have therefore produced much better results.…”

Section: Discussionmentioning

confidence: 98%

“…Using a single-pixel camera and recording the time signal measured for each mask the image at a series of time periods can be calculated, this is effectively a high-speed video of the captured light. This method of using a single-pixel camera builds upon previous work measuring optical fiber modes [15] where the method was demonstrated with an order of magnitude lower temporal resolution, lower signal-to-noise and longer acquisition times.…”

Section: Introductionmentioning

confidence: 96%

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Measurement of the spin-orbit coupling interaction in ring-core optical fibers

Johnson

Padgett

et al. 2019

OSA Continuum

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Ring-core optical fibers have been designed to carry orbital angular momentum modes. We demonstrate the imaging of these modes, individually identifying modes separated temporally by only 30 ps. A single-pixel camera operating in the short-wave infrared detection range is used to image the 1550 nm wavelength optical modes. With this technique, examination of these optical modes can be performed with significantly higher temporal resolution than is possible with conventional imaging systems, such that the imaging of modes separated by spin-orbit coupling is achieved and evaluated. Deconvolution is required to separate the instrument response from the optical mode signal, increasing the clarity and temporal resolution of the measurement system.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 96%

Measurement of the spin-orbit coupling interaction in ring-core optical fibers

Johnson

Padgett

et al. 2019

OSA Continuum

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“…Here we quantify the improvement in SNR in a single-pixel imaging (SPI) system [12,13] by utilising the correlations from a photon-pair light source. SPI has been demonstrated at a variety of wavelengths [14][15][16], for high-speed applications [17,18], and performing depth measurements [19]. In SPI a series of patterns are projected onto a target, the total power of the corresponding transmitted or back-scattered light is measured using a single-pixel detector revealing the overlap between the projected pattern and the object [20].…”

Section: Introductionmentioning

confidence: 99%

Single-pixel imaging with heralded single photons

et al. 2022

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Traditional remote sensing applications are often based on pulsed laser illumination with a narrow linewidth and characteristic repetition rate, which are not conducive to covert operation. Whatever methods are employed for covert sensing, a key requirement is for the probe light to be indistinguishable from background illumination. We present a method to perform single-pixel imaging that suppresses the effect of background light and hence improves the signal-to-noise ratio by using correlated photon-pairs produced via spontaneous parametric down conversion. One of the photons in the pair is used to illuminate the object whilst the other acts as a temporal reference, allowing the signal photons to be distinguished from background noise. Understanding the noise regime is key to producing higher contrast images using this heralding method.

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“…Once the optical path difference between these arms, ∆ OPL , is greater than the coherence length of the pulse, p , light in these respective spatial modes no longer interferes, and the visibility of the output interference pattern reduces. In the extreme this leads to severe temporal pulse distortion -whereby a single input pulse fragments into separate pulses propagating in different spatial modes that exit the fibre in sequence and so are unable to interfere with one another [27]. In this case wavefront shaping, which relies on controlling the interference of different spatial modes at the output, is not possible without spatio-temporal compensation [28,29].…”

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confidence: 99%

Time-of-flight 3D imaging through multimode optical fibers

Stellinga

Phillips

Mekhail

et al. 2021

Science

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109

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Time-of-flight (ToF) 3D imaging has a wealth of applications, from industrial inspection to movement tracking and gesture recognition. Depth information is recovered by measuring the round-trip flight time of laser pulses, which usually requires projection and collection optics with diameters of several centimetres. In this work we shrink this requirement by two orders of magnitude, and demonstrate near video-rate 3D imaging through multimode optical fibres (MMFs) -the width of a strand of human hair. Unlike conventional imaging systems, MMFs exhibit exceptionally complex light transport resembling that of a highly scattering medium. To overcome this complication, we implement high-speed aberration correction using wavefront shaping synchronised with a pulsed laser source, enabling random-access scanning of the scene at a rate of ∼23,000 points per second. Using non-ballistic light we image moving objects several metres beyond the end of a ∼40 cm long MMF of 50 µm core diameter, with millimetric depth resolution, at frame-rates of ∼ 5Hz. Our work extends far-field depth resolving capabilities to ultra-thin micro-endoscopes, and will have a broad range of applications to clinical and remote inspection scenarios.

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A light-in-flight single-pixel camera for use in the visible and short-wave infrared

Cited by 18 publications

References 35 publications

Measurement of the spin-orbit coupling interaction in ring-core optical fibers

Measurement of the spin-orbit coupling interaction in ring-core optical fibers

Single-pixel imaging with heralded single photons

Time-of-flight 3D imaging through multimode optical fibers

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