光学与光子学期刊(英文)最新文献_第3页

Controlling the Bandgaps of One-Dimensional TiO₂/SiO₂, TiO₂/SnO₂, and SiO₂/SnO₂ Photonic Crystals Using the Transfer Matrix Method 利用转移矩阵法控制一维TiO2/SiO2、TiO2/SnO2和SiO2/SnO2光子晶体的带隙

光学与光子学期刊(英文) Pub Date : 2022-01-01 DOI: 10.4236/opj.2022.127013

Fatimah Alamrani, E. Alsharaeh

引用次数: 2

Linking Diffractive and Geometrical Optics Surface Scattering at a Fundamental Level 在基本水平上连接衍射光学和几何光学表面散射

光学与光子学期刊(英文) Pub Date : 2022-01-01 DOI: 10.4236/opj.2022.121001

C. Madsen

引用次数: 3

Experiments on Nanosecond Optical Parametric Generation for 486.0 nm in BBO Crystal 486.0 nm BBO晶体纳秒级光参量生成实验

光学与光子学期刊(英文) Pub Date : 2022-01-01 DOI: 10.4236/opj.2022.125008

Yaqi Wang, Tingting Lu, Qihui Luo, Jian Ma, Xiaolei Zhu

引用次数: 0

Beam Parameter Product Optimization for High Power SWIR Laser Diode Stack Fiber Coupling 大功率SWIR激光二极管堆叠光纤耦合的光束参数产品优化

光学与光子学期刊(英文) Pub Date : 2022-01-01 DOI: 10.4236/opj.2022.122002

Y. Lutz

引用次数: 0

The Physics behind the NASA Flyby Anomaly NASA飞掠异常背后的物理学

光学与光子学期刊(英文) Pub Date : 2022-01-01 DOI: 10.4236/opj.2022.123003

Richard A. Hutchin

{"title":"The Physics behind the NASA Flyby Anomaly","authors":"Richard A. Hutchin","doi":"10.4236/opj.2022.123003","DOIUrl":"https://doi.org/10.4236/opj.2022.123003","url":null,"abstract":"From 1990 to 2005 NASA did six flybys of Earth in order to boost the energy of each spacecraft, enabling them to go deeper into the solar system. These six flybys showed an unexpected violation in the conservation of energy of up to 100 sigmas, matching a simple physical formula related to the input and output spacecraft velocities relative to the Earth rotational plane. Mysteriously, occasionally the effect was not present. After several years of reviewing the data and evaluating all sources of perturbation known to NASA, no solution was identified. NASA sent the final report to the author above for further review. Independently, the author’s firm Optical Physics Company had published research into the vacuum field, finding that it was not constant but varied across the Earth’s orbit and was also separately detected being radiated by the Sun. The physics we had learned was applied to the NASA passes, allowing all the anomalies they had encountered to be explained and adding considerably to our understanding of the vacuum field. We hypothesized a radially emitted vacuum field (which controls the rate of time) would couple the radial direction r with time t to add a g tr term in the metric tensor. We then combined the previously published experimental data of the vacuum field radiated by the Sun with the NASA data to develop a formula for the emission of the vacuum field from warm rotating bodies, accurate to about 1%. 25 candidate formulas were evaluated, based on powers of radial acceleration and temperature, and one was definitively selected. This research offers a linkage between the vacuum field whose spectrum is proportional to h and an effect on the metric tensor of gravity. Since both gravity and h control time rates, it seemed credible they could both affect the metric tensor.","PeriodicalId":64491,"journal":{"name":"光学与光子学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70714689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sasa-Satsuma’s Dynamical Equation and Optical Solitary Wave Solutions Sasa-Satsuma的动力学方程和光孤立波解

光学与光子学期刊(英文) Pub Date : 2022-01-01 DOI: 10.4236/opj.2022.125010

C. T. D. Tchaho, J. P. Ngantcha, H. Omanda, Bruno Rodin Mbock Um, T. Ekogo, J. R. Bogning

引用次数: 1

Optimization of Crystal Structure Based on Experimentally Obtained XRD Patterns for Fluorescence of Sm³⁺-Doped TiO₂ Thin Films by Machine Learning 基于机器学习的Sm3+掺杂TiO2薄膜荧光XRD图的晶体结构优化

光学与光子学期刊(英文) Pub Date : 2022-01-01 DOI: 10.4236/opj.2022.126011

Yuri Tamamoto, M. Murayama, Xiwei Zhao

引用次数: 0

Perimeter Security System Based on Ultra-Weak Fiber Bragg Grating Array 基于超弱光纤光栅阵列的周界安防系统

光学与光子学期刊(英文) Pub Date : 2022-01-01 DOI: 10.4236/opj.2022.126012

Z. Luo, Hao Xiang, Yu Zhang, Bing Xu

引用次数: 0

Development and Demonstration of Australian First Working Sodium Guide Star Laser 澳大利亚第一台工作钠导星激光器的研制与示范

光学与光子学期刊(英文) Pub Date : 2022-01-01 DOI: 10.4236/opj.2022.124007

Yue Gao, Yanjie Wang, A. Chan, B. Greene

{"title":"Development and Demonstration of Australian First Working Sodium Guide Star Laser","authors":"Yue Gao, Yanjie Wang, A. Chan, B. Greene","doi":"10.4236/opj.2022.124007","DOIUrl":"https://doi.org/10.4236/opj.2022.124007","url":null,"abstract":"The Australian first working sodium guide star laser system has been designed and developed for various astronomical and space-related applications. A completely diode-pumped pulsed system was developed initially followed by a largely fiber-based continuous wave (CW) system operating at 589 nm achieved through a unique wavelength conversion scheme by combining 1342 and 1050 nm through a sum frequency generation process. For the CW system, single-mode laser beams at both 1342 and 1050 nm are achieved from fi-ber-based seed oscillators and fiber amplifiers. The output power of ~25 W at 1342 nm is achieved from a single frequency fiber Raman amplifier. Output power up to 70 W at 1050 nm is achieved from a Yb-doped fiber pre-amplifier followed by a Yb-doped fiber power amplifier. For the sum frequency generation process, optimum focusing parameters are evaluated and determined. The CW system has generated more than 20 W output power at 589 nm, a circularly polarised beam with a good beam quality, spectral linewidth ≤ 2 MHz, and the laser output locked on the sodium D 2 line at 589.159 nm. The system has been successfully demonstrated at EOS Space Research Centre, Mt Stromlo, Canberra, and become the Australian first working sodium guide star laser system.","PeriodicalId":64491,"journal":{"name":"光学与光子学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70714948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Wavefront Power Spectral Density Measurement of Aspheric Lens with Long Focal-Length Using a Computer-Generated Hologram 利用计算机生成全息图测量长焦距非球面透镜波前功率谱密度

光学与光子学期刊(英文) Pub Date : 2022-01-01 DOI: 10.4236/opj.2022.1211017

Xiaohong Wei, Kaiyuan Xu, Ang Liu

{"title":"The Wavefront Power Spectral Density Measurement of Aspheric Lens with Long Focal-Length Using a Computer-Generated Hologram","authors":"Xiaohong Wei, Kaiyuan Xu, Ang Liu","doi":"10.4236/opj.2022.1211017","DOIUrl":"https://doi.org/10.4236/opj.2022.1211017","url":null,"abstract":"To ensure the performance of the optical system, the machining accuracy of lens with long focal lengths is required to ensure the image quality. A new method for lens transmission wavefront power spectral density (PSD) in mid-frequency domain measurement using binary phase computer-generated hologram (CGH) is presented. This technique is widely applicable and is par-ticularly useful for measuring large-size lenses with long focal lengths. A comparison experiment of the CGH measurement with results from a Fizeau sphere interferometry method is carried out to verify the accuracy and con-venience of the measurement. Furthermore, measurement uncertainty due to CGH fabrication process is analysed. Analysis of the CGH test showed the overall accuracy of less than 1 nm RMS for a sphere lens with over 30 m focal length and Φ410 mm clear aperture. CGH can provide reference spheres with high precision, in the meantime greatly shorten air space, thus reducing the effect of vibration and air turbulence, therefore is of great importance for lens transmission wavefront PSD measurement. The realization of high precision, high efficiency and nondestructive testing of long focal-lens wavefront PSD ensure the ultra-precision and certainty level of machining, hence improving the comprehensive performance of the optical system.","PeriodicalId":64491,"journal":{"name":"光学与光子学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70714317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0