Using a pseudo-thermal light source to teach spatial coherence

Pieper, Kai; Bergmann, Antje; Dengler, Roman; Rockstuhl, Carsten

doi:10.1088/1361-6404/aaba03

Cited by 9 publications

(11 citation statements)

References 18 publications

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“…In order to avoid repetition of the light field every full rotation of the diffuser, transmission through a turbid solution of microspheres can be used to further spatially randomize the pattern [48]. The pseudothermal light that emerges compares in its coherence properties to the light of an actual thermal source such as an LED [55]. As discussed in section 3 an optical beamsplitter forms two near-identical copies of the light field which can be used as the reference and object beams in a classical GI system.…”

Section: Pseudothermalmentioning

confidence: 99%

Single-pixel imaging 12 years on: a review

2020

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Modern cameras typically use an array of millions of detector pixels to capture images. By contrast, single-pixel cameras use a sequence of mask patterns to filter the scene along with the corresponding measurements of the transmitted intensity which is recorded using a single-pixel detector. This review considers the development of single-pixel cameras from the seminal work of Duarte et al. up to the present state of the art. We cover the variety of hardware configurations, design of mask patterns and the associated reconstruction algorithms, many of which relate to the field of compressed sensing and, more recently, machine learning. Overall, single-pixel cameras lend themselves to imaging at non-visible wavelengths and with precise timing or depth resolution. We discuss the suitability of single-pixel cameras for different application areas, including infrared imaging and 3D situation awareness for autonomous vehicles.

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Section: Pseudothermalmentioning

confidence: 99%

Single-pixel imaging 12 years on: a review

2020

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“…We call these time intervals temporally coherent areas, in analogy to spatially coherent areas. 24,25 The average time between the phase jumps is called the coherence time s c .…”

Section: Theory a Temporally Coherent Areasmentioning

confidence: 99%

Full-field optical coherence tomography—An educational setup for an undergraduate lab

Pieper

Küchenmeister

Bergmann

et al. 2020

American Journal of Physics

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Optical coherence tomography, or in short OCT, is a measurement technique established in the early 1990s for the non-invasive imaging of interfaces in the bulk of biological tissues or other samples. A full-field OCT setup is built from a microscope combined with a Michelson interferometer, where the mirror in one arm is replaced by the sample. Using white light, which is temporally partially coherent, interference fringes disclose the presence of an interface whenever the lengths of both interferometer arms are nearly equal. Scanning one arm allows for a volumetric reconstruction of all interfaces inside the sample. While the importance of OCT in medicine is indisputable, it is hard to teach students the basic aspects of such technology as most available setups tend to be rather complex. It is our purpose to present a fully functional full-field OCT setup that is stripped-down to its essential components and to promote its use in an undergraduate lab course. The contribution is complemented by a description of the basic theory necessary to understand the working principle of OCT. V

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“…Unfortunately, it has been brought to our attention that there is a small mistake in our published article [1]. It concerns a typo in equations (1) and (6) of the original paper.…”

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confidence: 97%