Optics express最新文献_第4页

Enhancing phase unwrapping by noisy pixels identifying criteria and iterative adaptive filtering. 利用噪声像素识别准则和迭代自适应滤波增强相位展开。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.568644

Leijie Feng, Hubing Du, Feifei Gu, Jianwen Cui, Yanjie Li, Qian Zhu, Tete Xu, Gaopeng Zhang

{"title":"Enhancing phase unwrapping by noisy pixels identifying criteria and iterative adaptive filtering.","authors":"Leijie Feng, Hubing Du, Feifei Gu, Jianwen Cui, Yanjie Li, Qian Zhu, Tete Xu, Gaopeng Zhang","doi":"10.1364/OE.568644","DOIUrl":"https://doi.org/10.1364/OE.568644","url":null,"abstract":"Phase unwrapping is a challenging task due to the presence of noise in the wrapped phase map. This paper describes, to the best of our knowledge, a novel technique, termed as noisy pixels identifying criteria, for phase unwrapping to minimize fake phase jump errors caused by noise and phase residues to a minimum. Its characteristic lies in fully leveraging the information contained in fringe patterns that can accurately identify noise-contaminated pixels of the wrapped phase map by constructing a phase-shifting version of the wrapped phase map. Based on it, a locally selective adaptive filtering strategy is introduced where noise filtering is applied exclusively to the identified noisy pixels, thereby avoiding the blurring and detail loss commonly caused by global noise filtering. We must note that the window size of our filter can be dynamically adjusted based on the number of non-noisy pixels in the local neighborhood, and is automatically expanded when insufficient valid pixels are present. Moreover, we developed an explicit filtering termination criterion that can ensure both stability and efficiency of the filtering process when iteratively applying the proposed method to the noisy wrapped phase map. Finally, with the aid of the proposed noisy pixels identifying criteria and iterative adaptive filtering, the denoised wrapped phase is unwrapped correctly by the transport of intensity equation (TIE) based phase unwrapping algorithm. Both simulation and experimental results confirm that the proposed method achieves superior phase reconstruction accuracy and robustness, even under complex and noisy measurement conditions.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 15","pages":"31912-31934"},"PeriodicalIF":3.3,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144743716","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

Single-material phase retrieval in grating-based X-ray imaging using a physics-based model. 基于物理模型的基于光栅的x射线成像中单材料相位检索。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.560980

Florian Schaff, Johannes Brantl, Kaye S Morgan, Wolfgang Noichl, Johannes Melcher, Benedikt Günther, Martin Dierolf, Franz Pfeiffer

{"title":"Single-material phase retrieval in grating-based X-ray imaging using a physics-based model.","authors":"Florian Schaff, Johannes Brantl, Kaye S Morgan, Wolfgang Noichl, Johannes Melcher, Benedikt Günther, Martin Dierolf, Franz Pfeiffer","doi":"10.1364/OE.560980","DOIUrl":"https://doi.org/10.1364/OE.560980","url":null,"abstract":"X-ray phase-contrast imaging utilizes wave-optical effects to generate image contrast, complementing traditional X-ray attenuation. This has proven particularly interesting for investigating biological samples with tissues that would otherwise produce weak attenuation contrast. Amongst the available techniques, grating-based imaging and propagation-based imaging stand out as two of the most promising methods to advance medical imaging and microscopy, respectively. In propagation-based imaging, approximating the object as a single material enables single-shot imaging with substantially reduced noise levels and enhanced image quality. Building on the success of the single-material approximation in propagation-based imaging, this study explores its potential application in grating-based imaging. We derive a physics-based model that directly integrates the single-material approximation into signal processing. Applying this approach to experimental data demonstrates its ability to reduce noise in the resulting composite image. Comparing our results with those from a single-material-based post-processing method reveals comparable outcomes, further validating the applicability of the single-material approximation in grating-based imaging.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 15","pages":"31713-31721"},"PeriodicalIF":3.3,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144743795","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

Nonlinear absorption and parametric gain interaction in green-pumped subnanosecond MgO:PPLN OPG. 绿色泵浦亚纳秒MgO:PPLN OPG中非线性吸收与参数增益的相互作用。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.570650

Jonas Banys, Vygandas Jarutis, Julius Vengelis

{"title":"Nonlinear absorption and parametric gain interaction in green-pumped subnanosecond MgO:PPLN OPG.","authors":"Jonas Banys, Vygandas Jarutis, Julius Vengelis","doi":"10.1364/OE.570650","DOIUrl":"https://doi.org/10.1364/OE.570650","url":null,"abstract":"We report on optical parametric generation in a 532 nm-pumped periodically poled MgO-doped LiNbO3 (MgO:PPLN) crystal operating in the subnanosecond regime at GW/cm2-level peak pump intensities. Within the 690 - 2300 nm tunable Nd:YAG microlaser-based optical parametric generator (OPG), a pronounced nonlinear absorption for 532 nm wavelength was observed. Despite significant light-induced absorption losses, the OPG achieved μJ-level output energies with up to 62% conversion efficiency. We show that by pumping the OPG in an off-axis geometry, it is possible to exploit the QPM grating edge effect to tailor the pump intensity-dependent spatial and spectral properties of the output, resulting in reduced non-collinear QPM interaction and a twofold decrease in the far-field divergence of the signal and idler waves. A comprehensive numerical model was developed which qualitatively explained the observed OPG behavior. The achieved output parameters position the 532 nm-pumped MgO:PPLN OPG as an attractive seed source for subnanosecond optical parametric amplification in the visible spectral range.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 15","pages":"32903-32917"},"PeriodicalIF":3.3,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144743757","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

Generalized non-linear reconstructor for all Fourier-type wavefront sensors. 所有傅里叶型波前传感器的广义非线性重构器。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.567084

Victoria Laidlaw

{"title":"Generalized non-linear reconstructor for all Fourier-type wavefront sensors.","authors":"Victoria Laidlaw","doi":"10.1364/OE.567084","DOIUrl":"https://doi.org/10.1364/OE.567084","url":null,"abstract":"State-of-the-art adaptive optics (AO) systems perform non-linear Fourier-type wavefront sensing for real-time corrections of dynamic wavefront aberrations. This general class of sensors uses a filtering mask in the focal plane that converts phase fluctuations of the incoming light into intensity variations in the subsequent pupil plane. Due to their high sensitivity, Fourier-type wavefront sensors (WFSs) are the sensors of choice for many current and upcoming AO systems in ophthalmic imaging, free-space optical communications (FSOC) and astronomical ground-based telescopes such as the forthcoming generation of extremely large telescopes (ELTs). Conventionally, linear methods, like a matrix-vector-multiplication (MVM), are used for the inversion of Fourier-type WFSs. However, their non-linear behavior gives rise to severe performance degradations when significant channel perturbations are observed. They are expected to occur during relatively strong atmospheric turbulence conditions, which are commonplace for both non-rural sites and daytime observations. Other sources for these conditions can be non-common path aberrations and short sensing wavelengths. This study presents a type of iterative reconstructor to overcome non-linear wavefront sensing regimes. The underlying method is the non-linear Landweber iteration with Nesterov acceleration, well known in the field of inverse problems. A significant advantage of the approach is its direct applicability to any Fourier-type WFS. This is implemented by adapting the filtering mask of the specific Fourier-type WFSs in the model-based algorithm. Several Fourier-type wavefront sensors are considered for ELT-scale instruments and the applicability of the algorithm is shown. The study goes on to concentrate on the pyramid wavefront sensor (PWFS), one of the most well-known Fourier-type WFSs. We demonstrate in end-to-end simulations that this approach outperforms linear methods in non-linear sensing regimes.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 15","pages":"31281-31294"},"PeriodicalIF":3.3,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144743724","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

GHz fundamental mode-locking of a highly integrated Er-doped all-fiber ring laser. 高集成度掺铒全光纤环形激光器的GHz基频锁模。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.571053

Maolin Dai, Bowen Liu, Yifan Ma, Ruoao Yang, Zhigang Zhang, Sze Yun Set, Shinji Yamashita

引用次数: 0

High spatial resolution Raman distributed fiber sensing based on neural network dispersion compensation. 基于神经网络色散补偿的高空间分辨率拉曼分布式光纤传感。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.566636

Yang Xu, Rilong Wang, Xiaohui Xue, Jian Li, Mingjiang Zhang

{"title":"High spatial resolution Raman distributed fiber sensing based on neural network dispersion compensation.","authors":"Yang Xu, Rilong Wang, Xiaohui Xue, Jian Li, Mingjiang Zhang","doi":"10.1364/OE.566636","DOIUrl":"https://doi.org/10.1364/OE.566636","url":null,"abstract":"Raman distributed fiber sensing (RDFS) has garnered significant research attention due to its advantages such as wide measurement range, low cost, and rapid response. However, as the sensing distance of RDFS increases, dispersion effects in sensing fiber severely degrade the spatial resolution and temperature measurement accuracy. This paper proposes a RDFS based on a 1-dimensional dilated convolutional residual neural network (1D-DCRNN). Through analysis of multiple datasets affected by dispersion and combined with theoretical models, we construct training datasets to train the 1D-DCRNN, then employ the trained model to compensate for dispersion effects to enhance system performance. Experimental results depict that at a sensing distance of 16.8 km, the temperature error is reduced from over 16.0 ℃ to below 1.0 ℃ after dispersion compensation, while the spatial resolution improves from 3.0 m to 0.4 m. This technical achieves efficient dispersion compensation without requiring physical modifications to fiber transmission lines, providing a new technical avenue for long-distance, high-precision Raman distributed fiber sensing applications.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 15","pages":"31139-31154"},"PeriodicalIF":3.3,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144743730","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

In-plane waveguide optical orbital angular momentum mode generators using subwavelength metamaterials. 利用亚波长超材料的平面波导光学轨道角动量模式发生器。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.564636

Yanxia Zhang, Bojian Shi, Xiaoxin Li, Yanyu Gao, Wenya Gao, Qi Jia, Fangkui Sun, Yongyin Cao, Rui Feng, Weiqiang Ding

引用次数: 0

Investigating Raman backscattering decay and the perspective of time-multiplexed quantum communications. 研究拉曼后向散射衰减和时间复用量子通信的前景。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.561961

Pierre-Enguerrand Verdier, Romain Alléaume, Thomas Rivera

引用次数: 0

Laser-assisted positioning enables efficient fabrication of flexibly arranged concave microlens arrays via precision glass molding. 激光辅助定位可以通过精密玻璃成型实现灵活排列的凹微透镜阵列的高效制造。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.567329

Yang Shu, Bosen Kuang, Chao Ma, Can Yang

{"title":"Laser-assisted positioning enables efficient fabrication of flexibly arranged concave microlens arrays via precision glass molding.","authors":"Yang Shu, Bosen Kuang, Chao Ma, Can Yang","doi":"10.1364/OE.567329","DOIUrl":"https://doi.org/10.1364/OE.567329","url":null,"abstract":"Concave microlens arrays (MLAs) are critical for light uniformity, multi-focus imaging, and beam shaping, while their mass production with high precision is still costly and challenging. This study presents a novel precision glass molding (PGM) method, in which hole arrays with various layouts and intervals are firstly created by a nanosecond laser on the substrate, and then precision ceramic spheres are placed into them to form a convex mold assembly for forming flexibly arranged concave MLAs on the processed glass surface. As precision ceramic spheres can be easily assembled and replaced, failure of the entire mold caused by the local damage during PGM process can be avoided. The fabricated MLAs displayed a smooth surface (Sa≈13 nm), uniform features (σh = 0.95µm, σd = 5.96µm), low residual stress (<0.4 MPa), and excellent focusing and imaging capability, demonstrating the effectiveness of the proposed method. The rapid mass fabrication of glass optical elements for flexible MLAs also offers valuable insights for the design and production of other functional structural surfaces.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 15","pages":"32719-32736"},"PeriodicalIF":3.3,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144743745","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

Tiny integrated lasers and their application to industrial laser technologies: feature issue introduction. 微型集成激光器及其在工业激光技术中的应用：专题介绍。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.571207

Takunori Taira, Jun Hayashi, Nicolaie Pavel, Tohru Suzuki

引用次数: 0