Photonics最新文献_第3页

Output Characteristics of External-Cavity Mode-Hop-Free Tunable Laser Source in C+L Band C+L 波段外腔免跳模可调激光源的输出特性

IF 2.1 4区物理与天体物理

Photonics Pub Date : 2024-07-21 DOI: 10.3390/photonics11070677

Jisheng Sun, Liqiang Qiu, Lei Liu, Liwen Sheng, Yudong Cui, Lin Huang, Mengchun Pan, Fushun Nian, Jiafei Hu

引用次数: 0

Low-Bit-Depth Detection for Phase Retrieval with Higher Efficiency in Holographic Data Storage 在全息数据存储中以更高效率进行相位检索的低比特深度检测

IF 2.1 4区物理与天体物理

Photonics Pub Date : 2024-07-21 DOI: 10.3390/photonics11070680

Hongjie Liu, Shujun Zheng, Yongkun Lin, Haiyang Song, Xianmiao Xu, Xiong Li, Jihong Zheng, Qiang Cao, Xiao Lin, Xiaodi Tan

引用次数: 0

Photoacoustic Image Analysis of Dental Tissue Using Two Wavelengths: A Comparative Study 使用两种波长对牙科组织进行光声图像分析：对比研究

IF 2.1 4区物理与天体物理

Photonics Pub Date : 2024-07-21 DOI: 10.3390/photonics11070678

Marco P. Colín-García, Misael Ruiz-Veloz, Luis Polo-Parada, Rosalba Castañeda-Guzmán, Gerardo Gutiérrez-Juárez, A. Pérez-Pacheco, R. G. Ramírez-Chavarría

{"title":"Photoacoustic Image Analysis of Dental Tissue Using Two Wavelengths: A Comparative Study","authors":"Marco P. Colín-García, Misael Ruiz-Veloz, Luis Polo-Parada, Rosalba Castañeda-Guzmán, Gerardo Gutiérrez-Juárez, A. Pérez-Pacheco, R. G. Ramírez-Chavarría","doi":"10.3390/photonics11070678","DOIUrl":"https://doi.org/10.3390/photonics11070678","url":null,"abstract":"This work compares photoacoustic images of a tooth by analyzing the signals generated with wavelengths 532 and 355 nm. This comparison addresses the differences in the optical properties of dental tissue for these wavelengths that affect the resulting photoacoustic images. A pulsed Nd:YAG laser was used to illuminate a complete extracted tooth sample, and 2D photoacoustic images (PAIs) were reconstructed using the single-sensor scanning synthetic aperture focusing technique (SSC-SAFT), which is a suitable method for our experimental system with forward detection mode. Signal comparison was conducted using sinogram, signal-to-noise ratio (SNR), root mean square (RMS), arrival time, maximum amplitude, and fast Fourier transform (FFT). PAI comparison utilized intensity profile, edge correlation, and image composition tools. The signal analysis revealed that at 532 nm, the signals exhibited longer decay time and a wider distribution of vibration frequencies due to higher laser pulse energy and greater optical penetration depth. Conversely, at 355 nm, the signals had shorter decay times and a lower frequency distribution, which was attributed to lower energy but improved optical absorption, resulting in reconstructed images with better sharpness and contour definition. This study contributes to the advancement of photoacoustic imaging technology in dentistry by providing insights that could optimize signal generation and image reconstruction for dental tissue.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141818845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

A Reduction in the Rotational Velocity Measurement Deviation of the Vortex Beam Superposition State for Tilted Object 减少倾斜物体涡束叠加态的旋转速度测量偏差

IF 2.1 4区物理与天体物理

Photonics Pub Date : 2024-07-21 DOI: 10.3390/photonics11070679

Hongyang Wang, Yinyin Yan, Zijing Zhang, Hao Liu, Xinran Lv, Chengshuai Cui, Hao Yun, Rui Feng, Yuan Zhao

引用次数: 0

Low-Cost High-Speed Fiber-Coupled Interferometer for Precise Surface Profilometry 用于精确表面轮廓测量的低成本高速光纤耦合干涉仪

IF 2.1 4区物理与天体物理

Photonics Pub Date : 2024-07-19 DOI: 10.3390/photonics11070674

Sebastian Hagemeier, Yijian Zou, T. Pahl, Felix Rosenthal, Peter Lehmann

引用次数: 0

Numerical Simulation of the Laser Welding Process for Diamond Saw Blades 金刚石锯片激光焊接工艺的数值模拟

IF 2.1 4区物理与天体物理

Photonics Pub Date : 2024-07-19 DOI: 10.3390/photonics11070676

Qiang Xu, Xiaodie Cao, Yibo Liu, Yanjun Xu, Jiajun Wu

{"title":"Numerical Simulation of the Laser Welding Process for Diamond Saw Blades","authors":"Qiang Xu, Xiaodie Cao, Yibo Liu, Yanjun Xu, Jiajun Wu","doi":"10.3390/photonics11070676","DOIUrl":"https://doi.org/10.3390/photonics11070676","url":null,"abstract":"The development and application of laser welding transition layer technology is pivotal for manufacturing high-performance diamond saw blades. Despite its importance, there is a need for more precise modeling to optimize welding parameters and enhance blade performance. This study employs SYSWELD software to simulate the laser welding process, demonstrating high accuracy in predicting the molten pool shape. A cross-scale multi-field coupling model was established using the finite element method, incorporating temperature field, phase transformation, grain morphology, stress field, and fatigue performance. A comprehensive life cycle assessment identified optimal welding parameters. The results indicate that a laser welding speed of 26 mm/s and a power of 1700 W minimize weld stress, reduce the digital volume correlation (DVC) value, and enhance fatigue resistance. Additionally, welding tests confirmed that using 1700 W produced the highest tooth strength of 1200 MPa, validating the simulation results. This study addresses existing gaps in modeling accuracy and parameter optimization, offering a robust framework for improving the performance and reliability of laser-welded diamond saw blades.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141823514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Design and Study of Low Loss, High Birefringence Quasi-Symmetric Hollow-Core Anti-Resonant Fiber 低损耗、高双折射准对称中空芯反谐振光纤的设计与研究

IF 2.1 4区物理与天体物理

Photonics Pub Date : 2024-07-19 DOI: 10.3390/photonics11070675

Binhao Gao, Fang Tan, Dexiao Chen, Shunfa Cui, Zhiyong Hou, Yuze Zhang, Weichun Wang, Yumeng Ban, Dechun Zhou

{"title":"Design and Study of Low Loss, High Birefringence Quasi-Symmetric Hollow-Core Anti-Resonant Fiber","authors":"Binhao Gao, Fang Tan, Dexiao Chen, Shunfa Cui, Zhiyong Hou, Yuze Zhang, Weichun Wang, Yumeng Ban, Dechun Zhou","doi":"10.3390/photonics11070675","DOIUrl":"https://doi.org/10.3390/photonics11070675","url":null,"abstract":"Low-loss, high-birefringence, bend-resistant hollow-core anti-resonant fibers for infrared wavelengths have important applications in the fields of precision interferometric sensing, laser systems, and optical communications. In this paper, an eight-tube cladding quasi-symmetric hollow-core anti-resonant fiber is proposed, and two other anti-resonant fibers are designed based on this fiber structure. The finite element analysis method is used to numerically analyze the limiting loss, birefringence coefficient, bending resistance, and other properties of the three optical fibers after the optimized design. The results show that the limiting loss of the three optical fibers at λ = 1.55 μm is lower than 10−4 magnitude, and all of them obtain a birefringence coefficient of 10−4 magnitude; at the same time, the three optical fibers have their own characteristics and advantages, and the first optical fiber can reach a birefringence coefficient of 9.25 × 10−4 at λ = 1.52 μm.The limiting loss at λ = 1.55 μm is 3.42 × 10−5 dB/km. The minimum bending radius of the three types of anti-resonant fibers is less than 40 mm, which represents good bending characteristics, and the eight-tube cladding quasi-symmetric optical fiber has a bending loss of less than 2.10 × 10−3 dB/km when the bending radius is 28 mm. The three types of optical fibers have obtained good results in improving the mutual constraints between low limiting loss and high birefringence, with better results than the other two types. The obtained results have high development potential.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141823270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Optical and Scintillation Properties of Tb-Doped Gadolinium Pyrosilicate Single Crystals 掺镱焦硅酸钆单晶的光学和闪烁特性

IF 2.1 4区物理与天体物理

Photonics Pub Date : 2024-07-19 DOI: 10.3390/photonics11070673

Prom Kantuptim, Takumi Kato, D. Nakauchi, N. Pattanaboonmee, N. Kawaguchi, Kenichi Watanabe, W. Chewpraditkul, Takayuki Yanagida

{"title":"Optical and Scintillation Properties of Tb-Doped Gadolinium Pyrosilicate Single Crystals","authors":"Prom Kantuptim, Takumi Kato, D. Nakauchi, N. Pattanaboonmee, N. Kawaguchi, Kenichi Watanabe, W. Chewpraditkul, Takayuki Yanagida","doi":"10.3390/photonics11070673","DOIUrl":"https://doi.org/10.3390/photonics11070673","url":null,"abstract":"Gadolinium pyrosilicate (GPS, Gd2Si2O7) single crystals with different doping concentrations of Tb (0.1–2.0 mol%) are successfully fabricated using the floating-zone technique. In this work, the dependence of Tb-doping concentration on the photoluminescence (PL) and scintillation properties of Tb-doped GPS (Tb:GPS) has been investigated. The PL emission contour graph shows multiple emissions, with the strongest emissions at 378 nm for 0.1% and 0.5% Tb-doping and 544 nm for 1.0% and 2.0% Tb-doping, corresponding to Tb3+ 4f-4f transitions. The PL lifetimes of the specimens range from 4.89 to 5.22 ms. The scintillation spectra exhibit comparable wavelength and intensity trends to the PL emission. The scintillation lifetimes of the specimens range from 2.41 to 3.88 ms. The Tb:GPS specimens demonstrate a relatively excessive afterglow level, with Af20 values ranging from 1640 to 7250 ppm and Af40 values ranging from 136 to 362 ppm. Using recently developed pulse height measurement for millisecond decay scintillators, under excitation at 662 keV γ-rays, the 1.0% Tb:GPS specimen exhibits the highest scintillation light yield among all other specimens at 95,600 ph/MeV, making Tb:GPS one of the highest light yield oxide scintillators.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141820929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

VCSELs with Stable Linear Polarization Emission Induced by Dielectric Columnar Thin Film Mirrors 电介质柱状薄膜镜诱导的具有稳定线性偏振发射的 VCSEL

IF 2.1 4区物理与天体物理

Photonics Pub Date : 2024-07-18 DOI: 10.3390/photonics11070672

K. Panajotov

{"title":"VCSELs with Stable Linear Polarization Emission Induced by Dielectric Columnar Thin Film Mirrors","authors":"K. Panajotov","doi":"10.3390/photonics11070672","DOIUrl":"https://doi.org/10.3390/photonics11070672","url":null,"abstract":"We propose and analyze numerically new approaches to force the laser emission from VCSELs in a well-defined linear polarization independent of the existing phase and amplitude anisotropies by using dielectric columnar thin-film (CTF) layers in the distributed Bragg reflector (DBR). In one approach, we have demonstrated CTF-VCSELs with top DBR consisting of two alternating CTF layers grown in orthogonally oriented planes and with high and low refractive index for one linear polarization while having the same value of the refractive index value for the orthogonal linear polarization. Such CTF-VCSELs have large dichroism of the mirror losses for two orthogonal linear polarizations. We have also shown DBR designs with parallel columnar orientations of the two CTF dielectric materials. In a second approach, we implement only one CTF layer in the dielectric DBR chosen in such a way that only one linearly polarized longitudinal mode is resonant in the CTF-VCSEL while light with the orthogonally oriented linear polarization is out of resonance and thus cannot lase. Simple estimation of the polarization mode suppression ratio for the different exemplary designs of CTF-VCSELs based on TiO2 and TaO2 dielectric CTFs results in values as high as 80 dB, which compares favorably to the existing alternative approaches.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141826302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

TransPhoM-DS Study Grant Report: Rationale and Protocol for Investigating the Efficacy of Low-Power Transcranial Photobiomodulation on Language, Executive Function, Attention, and Memory in Down Syndrome TransPhoM-DS 研究资助报告：研究低功率经颅光生物调制对唐氏综合症患者的语言、执行功能、注意力和记忆力的疗效的原理和方案

IF 2.1 4区物理与天体物理

Photonics Pub Date : 2024-07-18 DOI: 10.3390/photonics11070670

W. Vieira, David Richer Araujo Coelho, Maia Gersten, Aura Maria Hurtado Puerto, Stefani Kalli, Guillermo Gonzalez-Garibay, Kayla McEachern, Julie A. Clancy, B. Skotko, L. Abbeduto, A. Thurman, M. Pulsifer, Elizabeth Corcoran, Anita E. Saltmarche, M. Naeser, Paolo Cassano

{"title":"TransPhoM-DS Study Grant Report: Rationale and Protocol for Investigating the Efficacy of Low-Power Transcranial Photobiomodulation on Language, Executive Function, Attention, and Memory in Down Syndrome","authors":"W. Vieira, David Richer Araujo Coelho, Maia Gersten, Aura Maria Hurtado Puerto, Stefani Kalli, Guillermo Gonzalez-Garibay, Kayla McEachern, Julie A. Clancy, B. Skotko, L. Abbeduto, A. Thurman, M. Pulsifer, Elizabeth Corcoran, Anita E. Saltmarche, M. Naeser, Paolo Cassano","doi":"10.3390/photonics11070670","DOIUrl":"https://doi.org/10.3390/photonics11070670","url":null,"abstract":"Down syndrome (DS) is the leading genetic cause of intellectual disability globally, affecting about 1 in every 800 births. Individuals with DS often face various neuropsychiatric conditions alongside intellectual disabilities due to altered brain development. Despite the diverse phenotypic expressions of DS, typical physical characteristics frequently influence language development and acquisition. EEG studies have identified abnormal oscillatory patterns in individuals with DS. Emerging interventions targeting the enhancement of gamma (40 Hz) neuronal oscillations show potential for improving brain electrical activity and cognitive functions in this population. However, effective cognitive interventions for DS remain scarce. Extensive research indicates that transcranial photobiomodulation (t-PBM) with near-infrared (NIR) light can penetrate deeply into the cerebral cortex, modulate cortical excitability, and enhance cerebral perfusion and oxygenation. Furthermore, t-PBM has been shown to improve cognitive functions such as language, attention, inhibition, learning, and memory, including working memory. This study presents the rationale and design of an ongoing randomized, sham-controlled clinical trial aimed at assessing the effectiveness of t-PBM using NIR light in enhancing the language abilities of individuals with DS.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141824330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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