Double Interferometer Design for Independent Wavefront Manipulation in Spectral Domain Optical Coherence Tomography

Kanngießer, Jonas; Rahlves, Maik; Roth, Bernhard

doi:10.1038/s41598-019-50996-2

Cited by 5 publications

(2 citation statements)

References 54 publications

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“…Kanngiesser et al reported a technique for independent wavefront manipulation at the sample and reference arm of a spectral domain OCT device [ 101 ]. The approach is based on a single spatial light modulator and can be implemented to existing free space SD-OCT systems through the introduction of an additional interferometer at the light source; see Figure 11 for a modular setup realized in the laboratory [ 102 ].…”

Section: Applications Of Wavefront Shaping To Optical Coherence Tomentioning

confidence: 99%

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Wavefront Shaping Concepts for Application in Optical Coherence Tomography—A Review

Kanngießer

Roth

2020

Sensors

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Optical coherence tomography (OCT) enables three-dimensional imaging with resolution on the micrometer scale. The technique relies on the time-of-flight gated detection of light scattered from a sample and has received enormous interest in applications as versatile as non-destructive testing, metrology and non-invasive medical diagnostics. However, in strongly scattering media such as biological tissue, the penetration depth and imaging resolution are limited. Combining OCT imaging with wavefront shaping approaches significantly leverages the capabilities of the technique by controlling the scattered light field through manipulation of the field incident on the sample. This article reviews the main concepts developed so far in the field and discusses the latest results achieved with a focus on signal enhancement and imaging.

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Section: Applications Of Wavefront Shaping To Optical Coherence Tomentioning

confidence: 99%

“…( c , d ) Wavefronts optimized at the sample beam and reference beam, respectively. Image adapted from [ 8 , 101 ], with permission. The signal enhancement obtained is clearly visible.…”

Section: Figurementioning

confidence: 99%

Wavefront Shaping Concepts for Application in Optical Coherence Tomography—A Review

Kanngießer

Roth

2020

Sensors

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An Extremely Pseudo‐Plastic, Organic Crystal‐Based Concentric‐Ring‐Resonator Coupled Optical Waveguide

Kumar,

Manoharan,

Khapre

et al. 2024

Advanced Physics Research

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The precise shaping of optical waveguides is crucial for advancing photonic circuit technologies. In this study, the first fabrication of a resonator is introduced with coiled circular geometry(CCG) using pseudo‐plastic microcrystals of 6,6′‐((1E,1′E)‐hydrazine‐1,2‐diylidenebis(methaneylylidene))bis(2,4‐dibromophenol), HDBP. The molecular packing supported by type‐II inter‐molecular halogen bonding and hydrogen bonding provides an exceptional strain‐holding capacity for HDBP crystals. This property enables the creation of compact CCGs with three interconnected turns utilizing an atomic force microscopy cantilever tip‐based mechanophotonics technique. This CCG acts as a concentric ring‐resonator (CRR) that splits and routes light in clockwise and anticlockwise directions along circular turns, providing optical interference. Subsequently, an HDBP optical waveguide is integrated with the CRR, resulting in the development of the organic crystal‐based optical filter. The modulation observed in optical modes’ wavelengths and their intensities in the waveguide when coupled with CRR shows optical filter functionality. This fabricated device holds promise for applications in high‐fidelity sensing, precision micro‐measurements, and optical quantum processing technologies, showcasing the potential of organic crystals in advancing photonics.

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Comparison between Hadamard and canonical bases for in situ wavefront correction and the effect of ordering in compressive sensing

Quinto‐Su¹,

Scheidt²

2022

J. Opt. Soc. Am. A

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In this work we compare the canonical and Hadamard bases for in situ wavefront correction of a focused Gaussian beam using a spatial light modulator (SLM). The beam is perturbed with a transparent optical element (sparse) or a random scatterer (both prevent focusing at a single spot). The phase corrections are implemented with different basis sizes ( N = 64 , 256 , 1024 , 4096 ) and the phase contribution of each basis element is measured with three-step interferometry. The field is reconstructed from the complete 3 N measurements, and the correction is implemented by projecting the conjugate phase at the SLM. Our experiments show that in general, the Hadamard basis measurements yield better corrections because every element spans the relevant area of the SLM, thus reducing the noise in the interferograms. In contrast, the canonical basis has the fundamental limitation that the area of the elements is proportional to 1 / N , and it requires dimensions that are compatible with the spatial period of the grating. In the case of the random scatterer, we only obtain reasonable corrections with the Hadamard basis and the intensity of the corrected spot increases monotonically with N , which is consistent with fast random changes in phase over small spatial scales. We also explore compressive sensing with the Hadamard basis and find that the minimum compression ratio needed to achieve corrections with similar quality to those that use the complete measurements depends on the basis ordering. The best results are achieved in the case of the Hadamard–Walsh and cake-cutting orderings. Surprisingly, in the case of the random scatterer we find that moderate compression ratios on the order of 10%–20% ( N = 4096 ) allow us to recover focused spots, although as expected, the maximum intensities increase monotonically with the number of measurements due to the non-sparsity of the signal.

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Double Interferometer Design for Independent Wavefront Manipulation in Spectral Domain Optical Coherence Tomography

Cited by 5 publications

References 54 publications

Wavefront Shaping Concepts for Application in Optical Coherence Tomography—A Review

Wavefront Shaping Concepts for Application in Optical Coherence Tomography—A Review

An Extremely Pseudo‐Plastic, Organic Crystal‐Based Concentric‐Ring‐Resonator Coupled Optical Waveguide

Comparison between Hadamard and canonical bases for in situ wavefront correction and the effect of ordering in compressive sensing

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