In-focus quantitative phase imaging from defocused off-axis holograms: synergistic reconstruction framework

Castaneda, Raul; Trujillo, Carlos; Doblas, Ana

doi:10.1364/ol.506400

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…( 9), respectively. Last year, Castaneda et al investigated a computational tool for reconstructing quantitative phase images from defocused holograms recorded in an off-axis telecentric-based DHM system using a heuristic framework [31]. This computational algorithm provides in-focus phase images without or with minimum phase distortions by minimizing a cost function that tracks the minimum value of the normalized variance in the reconstructed amplitude image and the minimum value of the phase jumps in the reconstructed phase image.…”

Section: Discussionmentioning

confidence: 99%

Overview of computational advances in quantitative phase imaging using digital holographic microscopy

Doblas,

Bogue-Jimenez,

Obando Vásquez

et al. 2024

Three-Dimensional Imaging, Visualization, and Display 2024

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Owing to its high resolution, sensitivity, imaged field of view, and frame rate acquisition, Digital Holographic Microscopy (DHM) stands out among the Quantitative phase imaging (QPI) techniques to reconstruct high-resolution phase images from micrometer-sized samples, providing information about the sample's topography and refractive index. Despite the successful performance of DHM systems, their applicability to in-situ clinical research has been partially hampered by the need for a standard phase reconstruction algorithm that provides quantitative phase distributions without any phase distortion. This invited talk overviews the current advances in computational DHM reconstruction approaches from semiheuristic to learning-based approaches.

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Section: Discussionmentioning

confidence: 99%

Overview of computational advances in quantitative phase imaging using digital holographic microscopy

Doblas,

Bogue-Jimenez,

Obando Vásquez

et al. 2024

Three-Dimensional Imaging, Visualization, and Display 2024

View full text Add to dashboard Cite

show abstract

“…When the refractive index and/or thickness of a material changes by recording, it is called a phase hologram. In the latter case, there is no absorption of incident light and the efficiency of the hologram can be higher than in the case of amplitude holograms [ 31 , 32 , 33 , 34 ].…”

Section: Materials Used For the Construction Of Hlsmentioning

confidence: 99%

Photopolymer Holographic Lenses for Solar Energy Applications: A Review

Alfaro,

Lloret,

Vilardy

et al. 2024

Polymers

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Holographic lenses (HLs) are part of holographic optical elements (HOE), and are being applied to concentrate solar energy on a focal point or focal line. In this way, the concentrated energy can be converted into electrical or thermal energy by means of a photovoltaic cell or a thermal absorber tube. HLs are able to passively track the apparent motion of the sun with a high acceptance angle, allowing tracking motors to be replaced, thus reducing the cost of support structures. This article focuses on a review of the materials used in the recording of a holographic lens (HL) or multiple HLs in photovoltaic and/or concentrating solar collectors. This review shows that the use of photopolymers for the recording of HLs enables high-performance efficiency in physical systems designed for energy transformation, and presents some important elements to be taken into account for future designs, especially those related to the characteristics of the HL recording materials. Finally, the article outlines future recommendations, emphasizing potential research opportunities and challenges for researchers entering the field of HL-based concentrating solar photovoltaic and/or concentrating solar thermal collectors.

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Comparative analysis of digital holographic microscopy and digital lensless holographic microscopy for quantitative phase imaging

Obando-Vásquez,

Lopera,

Restrepo

et al. 2024

Opt. Continuum

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This study provides a detailed comparison of two widely used quantitative phase imaging (QPI) techniques: single-shot off-axis digital holographic microscopy (DHM) and digital lensless holographic microscopy (DLHM). The primary aim is to evaluate and contrast critical aspects of their imaging performance, including spatial phase sensitivity, phase measurement accuracy, and spatial lateral resolution. Employing typical configurations for both DHM and DLHM, the study utilizes a customized phase test target featuring linear phase changes introduced by a specially designed linear density attenuation filter. Ground truth data from an atomic force microscope is incorporated to validate the experimental findings. The comparative analysis reveals that DHM and DLHM exhibit nearly identical spatial phase sensitivity, with DHM demonstrating a minimal 3.2% measurement error compared to DLHM's 4% in height measurement accuracy. Notably, DHM achieves a finer spatial lateral resolution down to 3.1 µm, surpassing DLHM's 5.52 µm. While DHM outperforms DLHM in precision and resolution, the latter offers advantages in terms of portability and cost-effectiveness. These findings provide valuable insights for researchers and practitioners, aiding in the informed selection of QPI methods based on specific application requirements.

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In-focus quantitative phase imaging from defocused off-axis holograms: synergistic reconstruction framework

Cited by 3 publications

References 22 publications

Overview of computational advances in quantitative phase imaging using digital holographic microscopy

Overview of computational advances in quantitative phase imaging using digital holographic microscopy

Photopolymer Holographic Lenses for Solar Energy Applications: A Review

Comparative analysis of digital holographic microscopy and digital lensless holographic microscopy for quantitative phase imaging

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