Article
Optics
Rania M. Abdelazeem, Mahmoud M. A. Ahmed, Mostafa Agour
Summary: Lens characterization is challenging due to incident wavefront aberrations. This study proposes an experimental configuration combining Shack-Hartmann wavefront sensor (SHWFS) with a deformable mirror (DM) to correct for aberrations and achieve an ideal plane wave. The system was tested on various lenses, and the proposed compensation system improved measurement accuracy and expanded the measurable range through a compound lens correction methodology.
Article
Optics
Nikolaus Berlakovich, Ernst Csencsics, Martin Fuerst, Georg Schitter
Summary: The algorithm presented in this paper can accurately register multiple wavefront segments, suitable for freeform wavefronts, with higher registration precision.
Article
Physics, Multidisciplinary
Yanrong Yang, Linhai Huang, Yawei Xiao, Naiting Gu
Summary: This paper proposes a new polarized SHWFS (p-SHWFS) based on the principle of polarization imaging, which uses the difference of state of polarization (SoP) between signal and stray light to improve image contrast. The p-SHWFS is composed of a micro-lens array and a linear polarization camera, which can analyze the degree of linear polarization (DoLP) and angle of linear polarization (AoLP) for the incident wavefront. Numerical simulation and practical experiments validate the feasibility and accuracy improvement of the p-SHWFS.
FRONTIERS IN PHYSICS
(2023)
Article
Optics
You Li, Junyong Zhang, Yaling Yang, Yanli Zhang
Summary: SHWS is a traditional method with simple structure, good usability, real-time monitoring and wide waveband. The introduction of self-interference Taiji lens is aimed to improve the precision of wavefront sensing, with experiments to verify its validity.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Optics
Yi Zheng, Mu Yang, Zheng-Hao Liu, Jin-Shi Xu, Chuan-Feng Li, Guang-Can Guo
Summary: In this work, we demonstrate the capability of the Shack-Hartmann wavefront sensor to detect weak values of transverse momentum, extending its input states to partially coherent states and comparing it with the weak measurement wavefront sensor. Our findings have important applications in fundamental quantum physics and quantum metrology.
Review
Polymer Science
Martina Vacalebre, Renato Frison, Carmelo Corsaro, Fortunato Neri, Sabrina Conoci, Elena Anastasi, Maria Cristina Curatolo, Enza Fazio
Summary: Adaptive optics is used to continuously measure and correct ocular aberrations, improving vision. The combination of wavefront technology and adaptive optics systems allows for preoperative evaluation of refractive surgical procedures and guidance for surgeons in choosing the appropriate parameters. This is important for improving patient vision quality and meeting clinical needs.
Article
Optics
Jing Wang, Xiaokun Wang, Lirong Peng, Jincheng Wang, Zhongkai Liu, Lingzhong Li, Mengxue Cai, Bin Liu, Wenhan Li, Xuejun Zhang
Summary: A non-null testing method utilizing Shack-Hartmann wavefront sensor is proposed to measure freeform surfaces, which improves measurement accuracy and dynamic range. A mathematical model and algorithm are developed to calculate the corresponding relationship between sampling points and spots, and experimental results demonstrate the feasibility and measurement capabilities of the method.
Article
Optics
Jing Wang, Xiaokun Wang, Lirong Peng, Jincheng Wang, Zhongkai Liu, Lingzhong Li, Mengxue Cai, Bin Liu, Wenhan Li, Xuejun Zhang
Summary: A non-null testing method utilizing a Shack-Hartmann wavefront sensor is proposed for measuring freeform surfaces. By establishing a mathematical model and algorithm, the dynamic range and measurement accuracy can be improved. Experimental results demonstrate the feasibility and measurement capabilities of this method.
Article
Optics
Yongfeng Zhang, Shengqian Wang, Hao Xian, Changhui Rao
Summary: A novel method based on matrix product is proposed in this Letter for calibrating the Shack-Hartmann wavefront sensor, which demonstrates superior accuracy and efficiency compared to traditional methods.
Article
Optics
Biswa R. Swain, Christophe Dorrer, Jie Qiao
Summary: An Optical Differentiation Wavefront Sensor based on a telephoto lens system and binary pixelated filters is reported in this study, which can measure wavefronts with accuracy better than lambda/10 Root Mean Squared (RMS) at lambda=633 nm. The system shows a high tolerance to components alignment errors in experimental investigation.
Article
Chemistry, Multidisciplinary
Bo Chen, Jingjing Jia, Yilin Zhou, Yirui Zhang, Zhaoyi Li
Summary: This paper proposes a novel subaperture image preprocessing method to improve the signal-to-noise ratio in an extended scene Shack-Hartmann wavefront sensor and enhance the accuracy of offset estimation and slope measurement.
APPLIED SCIENCES-BASEL
(2023)
Article
Optics
Vyas Akondi, Alfredo Dubra
Summary: This paper introduces an alternative definition of optical dynamic range based on avoiding the overlap of lenslet images. Compared to the traditional lenslet-bound definition, the optical dynamic range is larger and better adapted to the number of lenslets across the SHWS pupil. Additionally, a pre-centroiding algorithm is proposed to simplify the process of determining lenslet image locations in the presence of defocus and astigmatism.
Article
Engineering, Electrical & Electronic
Yu-Hsiang Lin, Jia-Hong Jian, Jia-Han Li
Summary: The study proposes using the Shack-Hartmann wavefront sensor system to measure the refractive index of hydrogel materials, finding that the P407-DA hydrogel is suitable for designing corneal samples and its refractive index is similar to elasmobranch corneas. This non-contact, minimally invasive, and time-efficient method can guide the development of better biocompatible materials for artificial cornea.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Optics
Fan Feng, Chen Liang, Dongdong Chen, Ke Du, Runjia Yang, Chang Lu, Shumin Chen, Wenting He, Pingyong Xu, Liangyi Chen, Louis Tao, Heng Mao
Summary: This article presents an approach for space-variant Shack-Hartmann wavefront reconstruction based on image moment theory. The relation between the moment of a pair of subimages and the local transformation coefficients is derived, and a special solution is obtained using the square guide 'star'. Our moment-based wavefront reconstruction has reduced computational complexity compared to the iteration-based algorithm. Image restorations using both the tiling strategy with 5 x 5 PSFs and the conventional strategy with a global average PSF are executed. Our approach is supported by visual and quantitative evaluations.
OPTICS COMMUNICATIONS
(2023)
Article
Chemistry, Analytical
Xian Yue, Yaliang Yang, Fei Xiao, Hao Dai, Chao Geng, Yudong Zhang
Summary: In this study, the data processing procedure and methods of Virtual Shack-Hartmann wavefront sensing (vSHWS) were demonstrated, and the parameters were optimized to achieve the best performance, significantly improving its anti-noise performance.
Article
Optics
Mikkel Jensen, Ivan Bravo Gonzalo, Rasmus Dybbro Engelsholm, Michael Maria, Niels Moller Israelsen, Adrian Podoleanu, Ole Bang
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2019)
Article
Biochemical Research Methods
Adrian Podoleanu, Ramona Cernat, Adrian Bradu
BIOMEDICAL OPTICS EXPRESS
(2019)
Article
Optics
Rene Riha, Manuel J. Marques, Michael R. Hughes, Adrian Bradu, Adrian Podoleanu
Article
Medicine, Legal
Manuel J. Marques, Robert Green, Roberto King, Simon Clement, Peter Hallett, Adrian Podoleanu
Summary: The advancement of identification and anti-counterfeiting technologies has led to increasingly complex security features in identity documents, including embedded security features. As documents become harder to forge, forgery detection becomes more sophisticated.
Article
Engineering, Manufacturing
Sophia N. Economidou, Md Jasim Uddin, Manuel J. Marques, Dennis Douroumis, Wan Ting Sow, Huaqiong Li, Andrew Reid, James F. C. Windmill, Adrian Podoleanu
Summary: The 3DMNMEMS is a novel drug delivery device that combines 3D printing, microneedles, and Microelectromechanical Systems (MEMS) to achieve versatile and controllable transdermal drug delivery. By utilizing advanced imaging techniques, the device's ability to monitor the distribution of liquid in skin tissue in real time is demonstrated, with in vivo testing showing improved glycemic control compared to subcutaneous injections. These results highlight the potential of the 3DMNMEMS as a universal personalized care transdermal drug delivery system.
ADDITIVE MANUFACTURING
(2021)
Article
Optics
Manuel J. Marques, Ramona Cernat, Jason Ensher, Adrian Bradu, Adrian Podoleanu
Summary: This paper presents a different approach for processing interferometer signals driven by swept sources with non-linear tuning, evaluating the suitability of the Master-Slave (MS) procedure for such sources. The Master-Slave process is applied to intact interferogram spectrum delivered by an OCT system, allowing near-coherence-limited operation at a large axial range. Depth information can be recovered with some limitations in both cases.
Article
Chemistry, Analytical
Ralph-Alexandru Erdelyi, Virgil-Florin Duma, Cosmin Sinescu, George Mihai Dobre, Adrian Bradu, Adrian Podoleanu
Summary: This study aims to explore the unique capabilities of OCT in optimizing X-ray imaging for dental diagnoses and treatment monitoring, comparing the potential of different imaging techniques and developing an optimized protocol for each type of dental investigation.
Article
Biochemical Research Methods
Manuel J. Marques, Michael R. Hughes, Adrian F. Uceda, Grigory Gelikonov, Adrian Bradu, Adrian Podoleanu
Summary: This paper introduces a method of converting a 1D scanning probe into a 2D scanning probe by manual scanning, allowing for real-time imaging and motion correction in forward-viewing optical coherence tomography (OCT) and fluorescence imaging. The approach is capable of handling out-of-plane motion at relatively high speeds.
BIOMEDICAL OPTICS EXPRESS
(2022)
Article
Optics
Rene Riha, Adrian Bradu, Adrian Podoleanu
Summary: This paper demonstrates a fast dual resonance akinetic optical swept source operating at 1550 nm. By employing a fiber intensity modulator as a mode-locking element and using a chirped fiber Bragg grating to provide sufficient dispersion, a tuning range of 25 nm was achieved for a sweep frequency of approximately 900 kHz.
Article
Engineering, Electrical & Electronic
Alejandro Martinez Jimenez, Sacha Grelet, Veronika Tsatourian, Patrick Bowen Montague, Adrian Bradu, Adrian Podoleanu
Summary: This Letter demonstrates a swept-source optical coherence tomography (SS-OCT) instrument that utilizes an innovative scanning protocol to achieve high-speed volumetric rate imaging. By combining an ultra-fast lateral scanner and a swept laser, the instrument is able to provide A-scans at a repetition rate of 40 MHz and an unprecedented 3D-OCT volume acquisition rate of 400 Hz.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Sacha Grelet, Alejandro Martinez Jimenez, Rasmus Dybbro Engelsholm, Patrick Bowen Montague, Adrian Podoleanu
Summary: This study presents a light source based on a mode-locked laser and time stretch technique, which can be used for ultrafast swept-source optical coherence tomography (SS-OCT). The source has a high A-scan rate and axial resolution, and enables high-speed OCT without being bandwidth limited.
IEEE PHOTONICS JOURNAL
(2022)
Article
Chemistry, Physical
Adrian Cioabla, Virgil-Florin Duma, Corina Mnerie, Ralph-Alexandru Erdelyi, George Mihai Dobre, Adrian Bradu, Adrian Podoleanu
Summary: This study assessed the suitability of 3D-printed materials in 3D-printed PLA-based reactors for biogas production. The effects of temperature, pH, aqueous and gaseous phases on the bioreactor were investigated. OCT imaging method was used to analyze degradation level of 3D-printed samples, and the impact of the biogas-generating process and the capability of OCT assessment were demonstrated. Future work may focus on in situ investigations of similar bioreactors using OCT.
Review
Chemistry, Analytical
Rachel E. Sully, Colin J. Moore, Hemda Garelick, Eriketi Loizidou, Adrian G. Podoleanu, Vladimir Gubala
Summary: The combination of nanomedicine and microneedle applications shows promise in overcoming healthcare challenges, but crucial questions regarding colloidal stability and optimal formulation of nanoparticles remain unanswered. Dissolvable microneedles could help maintain stable nano-sized formulations and enhance nanoparticle penetration capabilities.
ANALYTICAL METHODS
(2021)
Article
Materials Science, Multidisciplinary
Rachel E. Sully, Hemda Garelick, Eriketi Z. Loizidou, Adrian G. Podoleanu, Vladimir Gubala
Summary: In this work, a simple methodology was described for synthesizing biodegradable microneedle systems infused with silica nanoparticles (SiNP). The distribution of nanoparticles within the microneedle matrix in a uniform, un-aggregated form enabled sustained release of the nanoparticles. The combination of nanoparticles and biodegradable microneedles offers a new pathway to nanomedicine-related applications.
MATERIALS ADVANCES
(2021)
Article
Materials Science, Biomaterials
Emerald R. Taylor, Silvia Cavuoto, David M. Beal, Sophie Caujolle, Adrian Podoleanu, Christopher J. Serpell
JOURNAL OF MATERIALS CHEMISTRY B
(2019)
