Optics express最新文献_第8页

Sampling requirements in near-field ptychography. 近场平面摄影的采样要求。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.544490

Luca Fardin, Yelyzaveta Pulnova, Tomáš Parkman, Iuliia Baranová, Sylvain Fourmaux, Chris Armstrong, Michela Fratini, Uddhab Chaulagain, Jaroslav Nejdl, Borislav Angelov, Darren J Batey, Alessandro Olivo, Silvia Cipiccia

{"title":"Sampling requirements in near-field ptychography.","authors":"Luca Fardin, Yelyzaveta Pulnova, Tomáš Parkman, Iuliia Baranová, Sylvain Fourmaux, Chris Armstrong, Michela Fratini, Uddhab Chaulagain, Jaroslav Nejdl, Borislav Angelov, Darren J Batey, Alessandro Olivo, Silvia Cipiccia","doi":"10.1364/OE.544490","DOIUrl":"https://doi.org/10.1364/OE.544490","url":null,"abstract":"Ptychography is a robust lensless form of microscopy routinely used for applications spanning life and physical sciences. The most common ptychography setup consists in using a detector to record diffraction patterns in the far-field. A near-field version has been more recently introduced, and its potential is yet to be fully exploited. In this work, the sampling requirements for near-field ptychography are analysed. Starting from the characterisation available in literature, the formalism of the fractional Fourier transform is used to generalise analytically the sampling conditions. The results harmonise the far- and near-field regimes and widen the applications of the technique with respect to the current knowledge. This study is supported by simulations and provides clear guidelines on how to optimise the setup and acquisition strategies for near-field ptychography experiments. The results are key to drive the translation of the technique towards low brilliance sources.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 7","pages":"15614-15623"},"PeriodicalIF":3.2,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143985013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tool-path planning for 2.5D laser polishing of optical lenses. 光学透镜2.5D激光抛光的刀路规划。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.551580

Manuel Jung, Tobias Brunner, Edgar Willenborg, Christian Vedder

引用次数: 0

Terahertz time-of-flight tomography algorithm for different curvature samples. 不同曲率样本的太赫兹飞行时间层析成像算法。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.547309

Yu Zhou, Quanyong Li, Zongyu Cui, Jiyang Zhang, Jiaojiao Ren, Dandan Zhang, Jian Gu, Haoxiang Li, Zihao Lin

{"title":"Terahertz time-of-flight tomography algorithm for different curvature samples.","authors":"Yu Zhou, Quanyong Li, Zongyu Cui, Jiyang Zhang, Jiaojiao Ren, Dandan Zhang, Jian Gu, Haoxiang Li, Zihao Lin","doi":"10.1364/OE.547309","DOIUrl":"https://doi.org/10.1364/OE.547309","url":null,"abstract":"Traditional guide rail-based terahertz reflection tomography works well with planar samples and complements transmission tomography. Most imaging methods perform effectively with plane-like or simple curvature samples. However, these methods are ineffective for complex shapes due to the challenges of dealing with internal corrections and stitching errors. To address the above issues, terahertz time-of-flight tomography is applied to the prepared samples with abnormal curvature using a rotating scanning array and \"point cloud splicing\" method. This approach enables comprehensive sample information collection and resolves the inner layer point cloud position correction challenge. A radial distance point cloud down-sampling method is proposed to reduce the impact of overlapping point clouds on reconstruction accuracy. After down-sampling, the outer layer reconstruction error reduces to 0.22%. Poisson surface reconstruction further enhances the intuitiveness of imaging results, and the reconstruction accuracy is 0.01 mm. This study broadens the application of terahertz time-of-flight tomography and offers a different approach for reflection tomography.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 7","pages":"15095-15109"},"PeriodicalIF":3.2,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144008485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic spectral tailoring of a 10 GHz laser frequency comb for enhanced calibration of astronomical spectrographs. 用于天文光谱仪增强校准的10 GHz激光频率梳的动态光谱裁剪。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.557365

Pooja Sekhar, Connor Fredrick, Peter Zhong, Abijith S Kowligy, Arman Cingöz, Scott A Diddams

{"title":"Dynamic spectral tailoring of a 10 GHz laser frequency comb for enhanced calibration of astronomical spectrographs.","authors":"Pooja Sekhar, Connor Fredrick, Peter Zhong, Abijith S Kowligy, Arman Cingöz, Scott A Diddams","doi":"10.1364/OE.557365","DOIUrl":"https://doi.org/10.1364/OE.557365","url":null,"abstract":"Laser frequency combs (LFCs) are an important component of Doppler radial velocity (RV) spectroscopy that pushes fractional precision to the 10-10 level, as required to identify and characterize Earth-like exoplanets. However, large intensity variations across the LFC spectrum that arise in the nonlinear broadening limit the range of comb modes that can be used for optimal wavelength calibration with sufficient signal-to-noise ratio. Furthermore, temporal spectral-intensity fluctuations of the LFC, that are coupled to flux-dependent detector defects, alter the instrumental point spread function (PSF) and result in spurious RV shifts. To address these issues and improve calibration precision, spectral flattening is crucial for LFCs to maintain a constant photon flux per comb mode. In this work, we demonstrate a dynamic spectral shaping setup using a spatial light modulator (SLM) over the wavelength range of 800-1300 nm. The custom shaping compensates for amplitude fluctuations in real time and can also correct for wavelength-dependent spectrograph transmission, achieving a spectral profile that delivers the constant readout necessary for maximizing precision. Importantly, we characterize the out-of-loop properties of the spectral flattener to verify a twofold improvement in spectral stability. This technique, combined with our approach of pumping the waveguide spectral broadener out-of-band at 1550 nm, reduces the required dynamic range. While this spectral region is tailored for the LFC employed at the Habitable-zone Planet Finder (HPF) spectrograph, the method is broadly applicable to any LFC used for astronomical spectrograph calibration.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 7","pages":"16305-16316"},"PeriodicalIF":3.2,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144003869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sensitive interferometry with multimode fibres. 多模光纤的敏感干涉测量。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.555168

Robert Archibald, Simon Peter Mekhail, Osian Wolley, Hao-Wei Hu, Graham Gibson, Miles Padgett

引用次数: 0

Analytical design of freeform surface parameters of optical system based on double Zernike polynomials. 基于双Zernike多项式的光学系统自由曲面参数解析设计。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.557283

Kai Wan, Zhiyuan Gu, Changxiang Yan

引用次数: 0

Visible light thermo-optic switches using an Nb₂O₅ waveguide. 使用Nb2O5波导的可见光热光开关。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.557894

Genkei Tei, Yuto Shinbo, Yisheng Ni, Shun Yajima, Yoshiki Hayama, Katsumi Nakatsuhara, Yuya Shoji

引用次数: 0

Deep-ultraviolet second harmonic generation down to 150 nm in a quartz crystal with chirped dual-periodic superstructure. 啁啾双周期超结构石英晶体在150nm深紫外二次谐波的产生。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.560518

Zhongmian Zhang, Yanling Cheng, Fei Liang, Haohai Yu, Huaijin Zhang, Yicheng Wu

{"title":"Deep-ultraviolet second harmonic generation down to 150 nm in a quartz crystal with chirped dual-periodic superstructure.","authors":"Zhongmian Zhang, Yanling Cheng, Fei Liang, Haohai Yu, Huaijin Zhang, Yicheng Wu","doi":"10.1364/OE.560518","DOIUrl":"https://doi.org/10.1364/OE.560518","url":null,"abstract":"Deep-ultraviolet (DUV) second harmonic generation (SHG) can realize the coherent sources for some modern equipment and optical spectroscopy measurements, however, that with nonlinear crystals is still a long-standing challenge due to the difficulty in phase-matching dependent on refractive dispersion relationship ruled by Lorentz model. Herein, we originally introduced the chirp into the additional periodic phase (APP) phase-matching and realized novel phase-matching conditions with the chirped additional periodic phase (CAPP) for DUV SHG with a CAPP quartz. The unprecedented tunable DUV SHG was realized with a wavelength from 150 to 203 nm (corresponding to a photon energy of 8.26∼6.1 eV). The developed light source presents the first SHG below 165 nm and would find promising applications in modern equipment such as angle-resolved photoemission spectroscopy (ARPES), optical atomic clocks, and DUV photodissociation dynamics. This strategy breaks the limitation of the Lorentz model for SHG and would be applicable for the extreme SHG approaching the transmittance edge of the nonlinear solid media.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 7","pages":"15579-15587"},"PeriodicalIF":3.2,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144063830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improved inverse design method based on AVM for long-distance dielectric laser accelerators. 基于AVM的远距离介质激光加速器改进反设计方法。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.558058

ZiYang Liu, QianQian Wang, ChenYi Yang, Ke Chen, DanDan Li, BingHeng Lu, PengXiang Yang, YaDong Yang

{"title":"Improved inverse design method based on AVM for long-distance dielectric laser accelerators.","authors":"ZiYang Liu, QianQian Wang, ChenYi Yang, Ke Chen, DanDan Li, BingHeng Lu, PengXiang Yang, YaDong Yang","doi":"10.1364/OE.558058","DOIUrl":"https://doi.org/10.1364/OE.558058","url":null,"abstract":"The dielectric laser accelerator (DLA) is an innovative on-chip particle accelerator that employs a periodic dielectric structure to modulate a laser beam, generating a longitudinal accelerating field to propel particles. Leveraging the high laser-induced damage threshold of dielectric materials, DLAs can achieve significantly higher acceleration gradients compared to traditional accelerators. Current inverse design approaches for DLAs, based on the adjoint variable method (AVM), overlook the impact of changes in electron velocity, which can result in dephasing between electrons and the accelerating field over long distances. To address this limitation, we propose an improved inverse design method that incorporates electron velocity variations into the objective function, specifically tailored for long-distance acceleration structures. Using an incident electric field amplitude of 1.2 GV/m, we designed a 20 µm DLA capable of accelerating 26.6 keV electrons with an average acceleration gradient of 347 MeV/m. Our method ensures sustained electron acceleration across the entire structure, surpassing the energy gain limits imposed by the original approach. Furthermore, the optimal initial electron energy in this design closely aligns with the target value (26.6 keV), demonstrating that the dephasing issue has been effectively resolved. This advancement paves the way for more efficient and robust on-chip particle acceleration.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 7","pages":"14737-14749"},"PeriodicalIF":3.2,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144063860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Near and mid-infrared emissions implications of hydroxyl groups in Er³⁺-doped tellurite glasses: enhancing luminescent properties via purification processes. Er3+掺杂碲酸盐玻璃中羟基的近红外和中红外发射影响：通过净化工艺增强发光性能。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.555193

I C Pinto, J-L Delarosbil, D H Spadoti, V A G Rivera, Y Messaddeq

{"title":"Near and mid-infrared emissions implications of hydroxyl groups in Er3+-doped tellurite glasses: enhancing luminescent properties via purification processes.","authors":"I C Pinto, J-L Delarosbil, D H Spadoti, V A G Rivera, Y Messaddeq","doi":"10.1364/OE.555193","DOIUrl":"https://doi.org/10.1364/OE.555193","url":null,"abstract":"Tellurite glasses are increasingly attracting interest from the photonics industry due to their promising spectroscopic properties. However, intrinsic absorption losses caused by impurities, especially hydroxyl groups (OH-) remain a significant challenge for achieving efficient infrared emission. This work presents what we believe to be a new purification method for Er3+-doped tellurite glasses using diethyl zinc to treat oxide precursors. Glasses with the composition 69.7 TeO2 - 25 ZnO - 5 La2O3 - 0.3 Er2O3 (mol %) were fabricated at each step of the purification and characterized. The effect of the purification in the reduction of OH content is evidenced in the decreased absorption coefficient from 2.57 to 0.22 cm-¹ at 3300 nm after applying the chemical treatment, which accounted for a decrease in the number of OH ions/cm3 from 2.88 × 1019 to 2.70 × 1018. The purification process significantly improved the optical properties, enabling consecutive emissions at 1535, 2700, and 3280 nm when pumped with an optical parametric oscillator (OPO) laser tuned to 522 nm. With the reduction of OH content, there was an increase in the emission efficiency from 78.6 to 93.9% and 7.3 to 10.7% for the emissions for 4I13/2→4I15/2 and 4I11/2→4I13/2, respectively.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 7","pages":"15451-15464"},"PeriodicalIF":3.2,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144026722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0