Applications of Optics and Photonics最新文献_第6页

Erbium and ytterbium co-doped transparent oxyfluoride glass-ceramics optical fibers 铒镱共掺透明氟氧玻璃陶瓷光纤

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2271623

E. Czerska, K. Wisniewski, E. Augustyn, C. Koepke, R. Lisiecki, M. Kępińska, M. Żelechower

{"title":"Erbium and ytterbium co-doped transparent oxyfluoride glass-ceramics optical fibers","authors":"E. Czerska, K. Wisniewski, E. Augustyn, C. Koepke, R. Lisiecki, M. Kępińska, M. Żelechower","doi":"10.1117/12.2271623","DOIUrl":"https://doi.org/10.1117/12.2271623","url":null,"abstract":"According to the earlier author’s papers, the erbium/ytterbium co-doped oxyfluoride glass-ceramics fibers should demonstrate better 1550 nm emission under 488/515/980 nm excitation (the erbium Er3+ ion transition 4I13/2→4I15/2) than corresponding glass fibers (the batch composition 48SiO211Al2O3-7Na2CO3-10CaO-10PbO-12PbF2- 1.5/0.6YbF3-0.5/0.2ErF3). Glass fibers provided as a core of standard multimode waveguide (the diameter of 62 μm) have been drawn with the mini-tower to the diameter between 50 μm and 80 μm, then annealed in the two-step regime (580°C/1h – nucleation of nano-crystals; 760oC/15/30 min – nano-crystals growth). This kind of heat treatment ensures the transparent glass-ceramics fibers with the microstructure of homogeneously distributed nano-crystals (lead, erbium and ytterbium enriched cubic fluorite-like crystals and hexagonal PbF2 crystals) embedded in a glassy host. Their transmission covers the range of 80-90% and seems to be sufficient with respect to their provided limited length (~2m). The luminescence intensity for glass-ceramics fibers at 1530 nm is higher than that of respective glass fibers and the lifetimes of the erbium ion excited state 4I13/2 are of the same order (~5 ms). In that context the glass-ceramics fibers discussed above seem to be promising candidates for cores of fiber lasers at the 1550 nm band.","PeriodicalId":150522,"journal":{"name":"Applications of Optics and Photonics","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123896096","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

Simulation of partially coherent light propagation using parallel computing devices 用并行计算装置模拟部分相干光的传播

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2272339

Tiago E. C. Magalhães, J. Rebordão

{"title":"Simulation of partially coherent light propagation using parallel computing devices","authors":"Tiago E. C. Magalhães, J. Rebordão","doi":"10.1117/12.2272339","DOIUrl":"https://doi.org/10.1117/12.2272339","url":null,"abstract":"Light acquires or loses coherence and coherence is one of the few optical observables. Spectra can be derived from coherence functions and understanding any interferometric experiment is also relying upon coherence functions. Beyond the two limiting cases (full coherence or incoherence) the coherence of light is always partial and it changes with propagation. We have implemented a code to compute the propagation of partially coherent light from the source plane to the observation plane using parallel computing devices (PCDs). In this paper, we restrict the propagation in free space only. To this end, we used the Open Computing Language (OpenCL) and the open-source toolkit PyOpenCL, which gives access to OpenCL parallel computation through Python. To test our code, we chose two coherence source models: an incoherent source and a Gaussian Schell-model source. In the former case, we divided into two different source shapes: circular and rectangular. The results were compared to the theoretical values. Our implemented code allows one to choose between the PyOpenCL implementation and a standard one, i.e using the CPU only. To test the computation time for each implementation (PyOpenCL and standard), we used several computer systems with different CPUs and GPUs. We used powers of two for the dimensions of the cross-spectral density matrix (e.g. 324, 644) and a significant speed increase is observed in the PyOpenCL implementation when compared to the standard one. This can be an important tool for studying new source models.","PeriodicalId":150522,"journal":{"name":"Applications of Optics and Photonics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124007309","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: 1

Development of a quantum particle in cell algorithm in GPU for solving Maxwell-Bloch equations 在GPU中求解Maxwell-Bloch方程的量子粒子胞内算法的发展

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2272052

M. Gomes, J. C. Costa, R. Alves, N. Silva, A. Guerreiro

引用次数: 3

Partially polarized pseudo-Schell model sources 部分极化伪谢尔模型源

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2272154

R. Martínez-Herrero, D. Maluenda, G. Piquero, Juan Carlos G. de Sande, M. Santarsiero, F. Gori

引用次数: 1

Energy transfer between silver clusters and europium Eu3+ ions in photo-thermo-refractive glasses 光-热折射玻璃中银团簇与铕Eu3+离子之间的能量转移

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2271688

M. Ghafoor, Y. Sgibnev, D. Marasanov, N. Nikonorov

引用次数: 2

Finite element model for the simulation of laser activated micro- and nano-scale drug delivery systems 激光激活微纳米级给药系统仿真的有限元模型

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2272721

Henrique Vilhena, J. Coelho, J. Rebordão

引用次数: 1

Image encryption scheme based on computer generated holography and time-averaged moiré 基于计算机生成全息和时间平均图像的图像加密方案

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2272126

P. Palevičius, M. Ragulskis, G. Janusas, A. Palevičius

{"title":"Image encryption scheme based on computer generated holography and time-averaged moiré","authors":"P. Palevičius, M. Ragulskis, G. Janusas, A. Palevičius","doi":"10.1117/12.2272126","DOIUrl":"https://doi.org/10.1117/12.2272126","url":null,"abstract":"A technique of computational image encryption and optical decryption based on computer generated holography and time-averaged moir´e is investigated in this paper. Dynamic visual cryptography (a visual cryptography scheme based on time-averaging geometric moir´e), Gerchberg–Saxton algorithm and 3D microstructure manufacturing techniques are used to construct the optical scheme. The secret is embedded into a cover image by using a stochastic moir´e grating and can be visually decoded by a naked eye. The secret is revealed if the amplitude of harmonic oscillations in the Fourier plane corresponds to an accurately preselected value. The process of the production of 3D microstructure is described in details. Computer generated holography is used in the design step and electron beam lithography is exploited for physical 3D patterning. The phase data of a complex 3D microstructure is obtained by Gerchberg-Saxton algorithm and is used to produce a computer generated hologram. Physical implementation of microstructure is performed by using a single layer polymethyl methacrylate as a basis for 3D microstructure. Numerical simulations demonstrate efficient applicability of this technique.","PeriodicalId":150522,"journal":{"name":"Applications of Optics and Photonics","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121238877","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: 1

Phase contrast imaging of red blood cells using digital holographic interferometric microscope 数字全息干涉显微镜下红细胞的相衬成像

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2276335

Varun Kumar, G. Khan, C. Shakher

引用次数: 8

Clinical performance of an objective methodology to categorize tear film lipid layer patterns 临床表现客观的泪膜脂质层模式分类方法

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2271845

C. García-Resúa, Hugo Pena-Verdeal, M. .. Giraldez, E. Yebra-Pimentel

{"title":"Clinical performance of an objective methodology to categorize tear film lipid layer patterns","authors":"C. García-Resúa, Hugo Pena-Verdeal, M. .. Giraldez, E. Yebra-Pimentel","doi":"10.1117/12.2271845","DOIUrl":"https://doi.org/10.1117/12.2271845","url":null,"abstract":"Purpose: To validate the performance of a new objective application designated iDEAS (Dry Eye Assessment System) to categorize different zones of lipid layer patterns (LLPs) in one image. Material and methods: Using the Tearscopeplus and a digital camera attached to a slit-lamp, 50 images were captured and analyzed by 4 experienced optometrists. In each image the observers outlined tear film zones that they clearly identified as a specific LLP. Further, the categorization made by the 4 optometrists (called observer 1, 2, 3 and 4) was compared with the automatic system included in iDEAS (5th observer). Results: In general, observer 3 classified worse than all observers (observers 1, 2, 4 and automatic application, Wilcoxon test, <0.05). The automatic system behaved similar to the remaining three observers (observer 1, 2 and 4) showing differences only for Open meshwork LLP when comparing with observer 4 (Wilcoxon test, p=0.02). For the remaining two observers (observer 1 and 2) there was not found statistical differences (Wilcoxon test, >0.05). Furthermore, we obtained a set of photographs per LLP category for which all optometrists showed agreement by using the new tool. After examining them, we detected the more characteristic features for each LLP to enhance the description of the patterns implemented by Guillon. Conclusions: The automatic application included in the iDEAS framework is able to provide zones similar to the annotations made by experienced optometrists. Thus, the manual process done by experts can be automated with the benefits of being unaffected by subjective factors.","PeriodicalId":150522,"journal":{"name":"Applications of Optics and Photonics","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128493594","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: 1

Photo-induced ultrasound microscopy for photo-acoustic imaging of non-absorbing specimens 用于非吸收标本的光声成像的光诱导超声显微镜

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2276315

Elena Tcarenkova, S. Koho, P. Hänninen

引用次数: 0