Common-Path Optical Coherence Tomography Using the Bessel Beam From Negative Axicon Optical Fiber Tip

Vairagi, Kaushal; Pandey, Amit; Gupta, Pooja; Minz, Rashmi A.; Tiwari, Umesh; Fick, Jochen; Mondal, Samir K.

doi:10.1109/jstqe.2018.2846023

Cited by 20 publications

(2 citation statements)

References 36 publications

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“…Axicons are a special kind of optical components with a cone-shaped phase profile, which generates a field distribution proportional to the zero-order Bessel function (non-diffracting Bessel beam). They can be used in large telescopes 27 , laser machining 28 , 29 , for medical applications 30 , 31 , or as optical tweezers 32 , 33 . Powell lenses resemble a round prism with a curved roofline and they shape a laser beam so that it stretches into a uniform line segment.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional light beam control device by stimuli-responsive liquid crystal micro-grating structures

Algorri

Morawiak

Zografopoulos

et al. 2020

Sci Rep

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there is an increasing need to control light phase with tailored precision via simple means in both fundamental science and industry. one of the best candidates to achieve this goal are electro-optical materials. In this work, a novel technique to modulate the spatial phase profile of a propagating light beam by means of liquid crystals (Lc), electro-optically addressed by indium-tin oxide (ito) grating microstructures, is proposed and experimentally demonstrated. A planar Lc cell is assembled between two perpendicularly placed ito gratings based on microstructured electrodes. By properly selecting only four voltage sources, we modulate the LC-induced phase profile such that non-diffractive Bessel beams, laser stretching, beam steering, and 2D tunable diffraction gratings are generated. In such a way, the proposed Lc-tunable component performs as an all-in-one device with unprecedented characteristics and multiple functionalities. the operation voltages are very low and the aperture is large. Moreover, the device operates with a very simple voltage control scheme and it is lightweight and compact. Apart from the demonstrated functionalities, the proposed technique could open further venues of research in optical phase spatial modulation formats based on electro-optical materials.

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Section: Introductionmentioning

confidence: 99%

Multifunctional light beam control device by stimuli-responsive liquid crystal micro-grating structures

Algorri

Morawiak

Zografopoulos

et al. 2020

Sci Rep

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show abstract

“…Multi-beam structures 31 can achieve a larger DOF by simultaneously focusing on different depths of the sample, but require complex hardware and software implementations. Additionally, non-diffracting beams such as Bessel 32,33 or Airy 34 beams can achieve large DOF and high resolution, but the imaging quality is usually limited by the severe sidelobes and low beam e ciency. In recent years, deep learning models have been used to improve the DOF 35,36 , but this requires a large amount of ground truth during training, and obtaining such data may be challenging or infeasible for certain subjects.…”

Section: Introductionmentioning

confidence: 99%

Needle-shaped beam optical coherence tomography angiography visualizing cortical blood perfusion after photothrombotic stroke in vivo

Huang

Guo

Zhao

et al. 2023

Preprint

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Optical imaging techniques provide low-cost, non-radiative images with high spatiotemporal resolution, making them advantageous for long-term dynamic observation of blood perfusion in stroke research and other brain studies compared to non-optical methods. However, high-resolution imaging in optical microscopy fundamentally requires a tight optical focus, and thus a limited depth of field (DOF). Consequently, large-scale, non-stitched, high-resolution images of curved surfaces, like brains, are difficult to acquire without z-axis scanning. To overcome this limitation, we developed a needle-shaped beam optical coherence tomography angiography (NB-OCTA) system, and for the first time, achieved a volumetric resolution of less than 8 µm in a non-stitched volume space of 6.4 mm × 4 mm × 620 µm in vivo. This system captures the distribution of blood vessels at 3.4-times larger depths than normal OCTA equipped with a Gaussian beam (GB-OCTA). We then employed NB-OCTA to perform long-term observation of cortical blood perfusion after stroke, and quantitatively analyzed the vessel area density (VAD) and the diameters of representative vessels in different regions over 10 days, revealing different spatiotemporal dynamics in the acute, sub-acute and chronic phase of post-ischemic revascularization. Benefiting from our NB-OCTA, we revealed that the recovery process is not only the result of spontaneous reperfusion, but also the formation of new vessels. This study provides visual and mechanistic insights into strokes and helps to deepen our understanding of the spontaneous response of brain after stroke.

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Exceptional imaging performance optic coherence tomography miniature probe based on sizable fiber axicon

Liu,

Zhang,

et al. 2025

Optics and Lasers in Engineering

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Common-Path Optical Coherence Tomography Using the Bessel Beam From Negative Axicon Optical Fiber Tip

Cited by 20 publications

References 36 publications

Multifunctional light beam control device by stimuli-responsive liquid crystal micro-grating structures

Multifunctional light beam control device by stimuli-responsive liquid crystal micro-grating structures

Needle-shaped beam optical coherence tomography angiography visualizing cortical blood perfusion after photothrombotic stroke in vivo

Exceptional imaging performance optic coherence tomography miniature probe based on sizable fiber axicon

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