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Experimental Measurement of Angular Anisoplanatism for Sodium Laser Guide Star: Synchronized Range Gating Realization 钠激光导星角各向异性的实验测量:同步距离门控实现
International Conference on Photonics, Optics and Laser Technology Pub Date : 2019-02-25 DOI: 10.5220/0007308401020109
Xi Luo, Xinyang Li, Xiaoyun Wang, K. Huang
{"title":"Experimental Measurement of Angular Anisoplanatism for Sodium Laser Guide Star: Synchronized Range Gating Realization","authors":"Xi Luo, Xinyang Li, Xiaoyun Wang, K. Huang","doi":"10.5220/0007308401020109","DOIUrl":"https://doi.org/10.5220/0007308401020109","url":null,"abstract":"Laser Guide Star (LGS) is an ideal synthetic beacon of Adaptive Optics (AO) for compensating for the atmospheric turbulence induced wave-front distortion of the science object; however the unavoidable anisoplanatism resulting from different light experience between the LGS and the science object through turbulent atmosphere will lead to a degradation of compensation performance, especially for the angular anisoplanatism in sodium LGS AO. By using our developed Hartmann-Shack (HS) wave-front sensor with accurate range gating mechanism, the return-light spot arrays through turbulent atmosphere from the natural star and the excited sodium LGS with certain angular offsets can be synchronously collected. Different from our previously published work (Luo et al., 2018), the experimental set-up, the structural design of the range gating mechanism, and the timing design of the synchronized control are discussed emphatically in this paper. The typical experimental measurement result of the angular anisoplanatism for the sodium LGS with 10” angular offsets is just briefly presented, which is basically consistent with our previous numerical simulation result (Luo et al., 2015). The majority of Zernike-modal de-correlations between the sodium LGS and the science object occur obviously, as the sodium LGS reference moving outside of the optical path from the science object to the telescope aperture.","PeriodicalId":294758,"journal":{"name":"International Conference on Photonics, Optics and Laser Technology","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121340482","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
Amplitude Vibration Measurement by Harmonic Frequency Analysis of a Distributed Acoustic Sensor 基于谐波频率分析的分布式声传感器幅值振动测量
International Conference on Photonics, Optics and Laser Technology Pub Date : 2019-02-25 DOI: 10.5220/0007373700460051
J. Preciado, D. Sanahuja, C. Heras, J. Subías, Lucía Hidalgo, Iñigo Salinas, P. Sevillano, J. J. Martínez, A. Villafranca
{"title":"Amplitude Vibration Measurement by Harmonic Frequency Analysis of a Distributed Acoustic Sensor","authors":"J. Preciado, D. Sanahuja, C. Heras, J. Subías, Lucía Hidalgo, Iñigo Salinas, P. Sevillano, J. J. Martínez, A. Villafranca","doi":"10.5220/0007373700460051","DOIUrl":"https://doi.org/10.5220/0007373700460051","url":null,"abstract":"Distributed acoustic sensors (DAS) based in coherent optical time-domain reflectometry (C-OTDR) provide a cost-effective solution for intrusion monitoring of large civil infrastructures like pipelines, railways or motorways. Although detection of events is well demonstrated, an estimation of the amplitude of these events is difficult to achieve. We propose a new method to recover the amplitude of the vibration from the conventional C-OTDR backscattered power traces. It is based on the FFT analysis of the DAS signals. Using a discrete accelerometer as a reference, we have calibrated the response of an optical fiber DAS using known stimuli. A correlation between the amplitude of the vibration and the ratios of the amplitudes of harmonics to the fundamental of the DAS signals is demonstrated. This analysis overcomes the main issues of the amplitude measurement, related to the interaction between the stimulus and the interference pattern.","PeriodicalId":294758,"journal":{"name":"International Conference on Photonics, Optics and Laser Technology","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132758322","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
LIBS based Tissue Differentiation for Er: YAG Surgical Laser 基于LIBS的Er: YAG手术激光组织分化
International Conference on Photonics, Optics and Laser Technology Pub Date : 2018-09-21 DOI: 10.5220/0006637402470251
F. Mehari, B. Lengenfelder, R. Figura, F. Klämpfl, Michael Schmidt
{"title":"LIBS based Tissue Differentiation for Er: YAG Surgical Laser","authors":"F. Mehari, B. Lengenfelder, R. Figura, F. Klämpfl, Michael Schmidt","doi":"10.5220/0006637402470251","DOIUrl":"https://doi.org/10.5220/0006637402470251","url":null,"abstract":"The analytical technique laser-induced breakdown spectroscopy (LIBS) is becoming an attractive technique in the field of medicine. One emerging application is the differentiation of biological tissues in real-time during laser surgery. This work attempts to further investigate the use of LIBS together with a surgical Er:YAG laser. The main goal here is to investigate the effect of body fluids as potential contaminants during LIBS based differentiation of soft tissues. Furthermore, the work attempts to exploit the use of the surgical laser as a cleaning laser and compares the effect when only the LIBS laser is used for tissue differentiation. The study shows that body fluids have a significant influence on the LIBS spectra and that a surgical laser might serve as an in-vivo cleaner leading to improved tissue classification during laser surgery.","PeriodicalId":294758,"journal":{"name":"International Conference on Photonics, Optics and Laser Technology","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128385858","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
FDTD Modeling and Simulation of Organic Light Emitting Diode with Improved Extraction Efficiency using Moth-eye Anti Reflective Coatings 采用飞蛾眼增透涂层提高萃取效率的有机发光二极管FDTD建模与仿真
International Conference on Photonics, Optics and Laser Technology Pub Date : 2018-04-04 DOI: 10.5220/0006651702660272
Chaya B. Muniraju, M. Venkatesha, Shruthi Neduri, Narayan Krishnaswamy
{"title":"FDTD Modeling and Simulation of Organic Light Emitting Diode with Improved Extraction Efficiency using Moth-eye Anti Reflective Coatings","authors":"Chaya B. Muniraju, M. Venkatesha, Shruthi Neduri, Narayan Krishnaswamy","doi":"10.5220/0006651702660272","DOIUrl":"https://doi.org/10.5220/0006651702660272","url":null,"abstract":"In this work modeling of two dimensional fluorescence based bottom emitting Organic Light Emitting Diode (OLED) using Moth eye Anti Reflective Coatings (ARC) is presented. The Finite Difference Time Domain (FDTD) mathematical modeling has been used to analyze the light extraction efficiency from fluorescence based Organic Light Emitting Diode (OLED). The OLED structure has been simulated by using 2D Moth-eye Anti Reflective coatings. The Finite Difference Time Domain (FDTD) method is used to model and simulate the OLED structure. An enhancement of Light Extraction Efficiency (LEE) has been achieved by inserting Moth-eye Anti Reflective coatings on the surface of the glass substrate which reduces reflection and increases the transmission. Comparative study is carried out between hexagonal photonic crystals and Moth eye Anti reflective coatings by placing these nanostructures on the substrate of OLED. The improvement in the far field intensity of OLED structure is achieved by optimizing the angular distribution of light through the substrate with moth eye anti reflective coatings.","PeriodicalId":294758,"journal":{"name":"International Conference on Photonics, Optics and Laser Technology","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128724934","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: 4
Surface Formation of Nano- / Micro- Structures on Titanium Alloy Composites using Picosecond Laser Scanning Technology 皮秒激光扫描技术在钛合金复合材料表面形成纳米/微结构
International Conference on Photonics, Optics and Laser Technology Pub Date : 2018-04-03 DOI: 10.5220/0006614201900196
Yi-Cheng Lin, Chih-Chung Yang, S. Tseng, D. Chiang, Yu-Hsuan Lin, Kuo-Cheng Huang, W. Hsiao
{"title":"Surface Formation of Nano- / Micro- Structures on Titanium Alloy Composites using Picosecond Laser Scanning Technology","authors":"Yi-Cheng Lin, Chih-Chung Yang, S. Tseng, D. Chiang, Yu-Hsuan Lin, Kuo-Cheng Huang, W. Hsiao","doi":"10.5220/0006614201900196","DOIUrl":"https://doi.org/10.5220/0006614201900196","url":null,"abstract":"This study reports on the development of picosecond laser system to titanium alloy surface treatment applications. In the picosecond laser-scanning system, that is based on the fiber-optics laser source and integrated with a designed optics / optical machine design and control technology of scanning system. To analyze the laser material interaction, the laser fluence, pulse repetition frequency of laser source, position of focused points, scan speed and pulse duration were adjusted. After laser surface treatment, the surface roughness and surface morphologies of treated surface were evaluated by using a field emission scanning electron microscope. Moreover, the contact angle measurement was used to analyze the hydrophilic and hydrophobic properties of the treatment surface with micro/ nanostructures.","PeriodicalId":294758,"journal":{"name":"International Conference on Photonics, Optics and Laser Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130554903","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
Fredholm Integral Equation for Finite Fresnel Transform 有限菲涅耳变换的Fredholm积分方程
International Conference on Photonics, Optics and Laser Technology Pub Date : 2018-04-03 DOI: 10.5220/0006709202860291
Tomohiro Aoyagi, Kouichi Ohtsubo, Nobuo Aoyagi
{"title":"Fredholm Integral Equation for Finite Fresnel Transform","authors":"Tomohiro Aoyagi, Kouichi Ohtsubo, Nobuo Aoyagi","doi":"10.5220/0006709202860291","DOIUrl":"https://doi.org/10.5220/0006709202860291","url":null,"abstract":"The fundamental formula in an optical system is Rayleigh diffraction integral. In practice, we deal with Fresnel diffraction integral as approximate diffraction formula. We seek the function that its total power is maximized in finite Fresnel transform plane, on condition that an input signal is zero outside the bounded region. This problem is a variational one with an accessory condition. This leads to the eigenvalue problems of Fredholm integral equation of the first kind. The kernel of the integral equation is Hermitian conjugate and positive definite. Therefore, eigenvalues are nonnegative and real number. By discretizing the kernel, the problem depends on the eigenvalue problem of Hermitian conjugate matrix in finite dimensional vector space. By using the Jacobi method, we compute the eigenvalues and eigenvectors of the matrix. We applied it to the problem of approximating a function and evaluated the error.","PeriodicalId":294758,"journal":{"name":"International Conference on Photonics, Optics and Laser Technology","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122153005","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
Optimization Parameters for Laser-induced Forward Transfer of Al and Cu on Si-wafer Substrate 硅衬底上激光诱导Al和Cu正向转移的优化参数
International Conference on Photonics, Optics and Laser Technology Pub Date : 2018-04-03 DOI: 10.5220/0006627702280231
Mohammad Hossein Azhdast, H. Eichler, K.-D. Lang, V. Glaw
{"title":"Optimization Parameters for Laser-induced Forward Transfer of Al and Cu on Si-wafer Substrate","authors":"Mohammad Hossein Azhdast, H. Eichler, K.-D. Lang, V. Glaw","doi":"10.5220/0006627702280231","DOIUrl":"https://doi.org/10.5220/0006627702280231","url":null,"abstract":"The research goal is to perform a laser-writing study to deposition of micro/nano particles on the substrate as interconnection usage. The threshold of laser energy, pulses per laser shot, as well as pulse overlapping is crucial to achieve the best deposition results possible. The present study aims to the novel technique by laser deposition of Aluminium and Copper nano particles on silicon wafer substrate. Thin μm films have been deposited from one-side coated glass to Silicon wafers by sputtering nano particles using laser radiation. Distance between donor film and substrate (ε) was up to several 100 μm and it has been optimized as 300 μm. A step-by-step optimization guide for deposition parameters were first developed and presented. The identification of laser energy threshold, pulses per laser shot, in addition to pulse overlapping is essential if the best deposition results are going to be drawn by laser direct writing method. This technique is regarded as the most important direct-write alternative for lithographic processes in order to generate patterns with","PeriodicalId":294758,"journal":{"name":"International Conference on Photonics, Optics and Laser Technology","volume":"382 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124753066","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: 2
Laser Drilling of a 7-layer Flexible Printed Circuit Board using a Pulsed Ytterbium Fiber Laser System 脉冲镱光纤激光系统在7层柔性印刷电路板上的激光打孔
International Conference on Photonics, Optics and Laser Technology Pub Date : 2018-04-03 DOI: 10.5220/0006613801780184
Chih-Chung Yang, Yi-Cheng Lin, Tzu-Chieh Peng, Kuo-Cheng Huang, Yu-Hsuan Lin
{"title":"Laser Drilling of a 7-layer Flexible Printed Circuit Board using a Pulsed Ytterbium Fiber Laser System","authors":"Chih-Chung Yang, Yi-Cheng Lin, Tzu-Chieh Peng, Kuo-Cheng Huang, Yu-Hsuan Lin","doi":"10.5220/0006613801780184","DOIUrl":"https://doi.org/10.5220/0006613801780184","url":null,"abstract":"Recently, laser-processing industry is becoming increasingly popular because of its advantages of low cost, fast and good energy efficiency. The electric circuit board manufacturers also began to import related laser processing technology to improve the productivity. This paper presents the laser drilling process and quality analysis of the 7-layer flexible printed circuit (FPCB). A laser drilling system pulsed Ytterbium fiber laser, expander device, focal lens, galvanometric scanner and XY-axis manual stage was used to perform the hole cutting of the multilayer-layer FPCB. This study succeeded in establishing a comparing procedure, which enabled the characteristic comparison between the various experimental conditions. We believe that this study provides a useful database for FPCB drilling technology.","PeriodicalId":294758,"journal":{"name":"International Conference on Photonics, Optics and Laser Technology","volume":"9 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115391389","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
Constrained Coding for Hardware-friendly Intensity Modulation 硬件友好型强度调制的约束编码
International Conference on Photonics, Optics and Laser Technology Pub Date : 2018-04-03 DOI: 10.5220/0006715802920296
Gilbert J. M. Forkel, Tom Wettlin, P. Hoeher
{"title":"Constrained Coding for Hardware-friendly Intensity Modulation","authors":"Gilbert J. M. Forkel, Tom Wettlin, P. Hoeher","doi":"10.5220/0006715802920296","DOIUrl":"https://doi.org/10.5220/0006715802920296","url":null,"abstract":"An advanced signal design for boosting the performance of binary-modulated IM/DD communication systems is presented. Multiple light sources are jointly modulated so that the optical signals superimpose at the receiver. The superimposed signal is of high rate. The switching sequences are constrained to match the physical properties of the transmit hardware. A graph-based representation is used to design a low-complexity block code, enabling the use of the binary superposition modulation scheme under investigation in a practical IM/DD setup. Based on this coded signal design measurement results on power consumption and simulation results on bit error rate performance are presented.","PeriodicalId":294758,"journal":{"name":"International Conference on Photonics, Optics and Laser Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114619083","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
Advances in Optical Sensing of Explosive Vapours 爆炸性气体光学传感技术的研究进展
International Conference on Photonics, Optics and Laser Technology Pub Date : 2018-01-25 DOI: 10.5220/0006729403230327
R. Gillanders, J. Glackin, Iain A. Campbell, I. Samuel, G. Turnbull
{"title":"Advances in Optical Sensing of Explosive Vapours","authors":"R. Gillanders, J. Glackin, Iain A. Campbell, I. Samuel, G. Turnbull","doi":"10.5220/0006729403230327","DOIUrl":"https://doi.org/10.5220/0006729403230327","url":null,"abstract":"Optical techniques for the detection of explosives are receiving increasing interest due to potentially fastresponding, highly-sensitive systems. Conjugated polymers are suitable probe materials for this application since their fluorescence is quenched by electronegative materials including explosives. This can be used to make a sensor for explosive vapour, which can then give chemical information to help identify explosive devices, and complements other approaches such as metal detectors and ground penetrating radar. Whilst the principle has been known for some time, its practical implementation requires considerable development of instrumentation and materials, including preconcentration materials. This paper reports our current efforts to address these challenges, with particular emphasis on humanitarian demining and looking towards application in Improvised Explosive Device (IED) detection.","PeriodicalId":294758,"journal":{"name":"International Conference on Photonics, Optics and Laser Technology","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133573978","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: 4
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