Advanced Optical Technologies最新文献

{"title":"M6 formalism – generalization of the laser beam quality factor M2 to the 3D domain","authors":"A. Brodsky, N. Kaplan","doi":"10.1515/aot-2020-0007","DOIUrl":"https://doi.org/10.1515/aot-2020-0007","url":null,"abstract":"Abstract Here we define a theoretical basis for the generalization of the beam quality factor M2 to three-dimensional (3D) space, which we call M6 formalism. The formalism is established through the use of examples of multifocal and Axicon optical systems to illustrate discrete and continuous axial beam shaping, respectively. For the continuous case, we expand the definition of the Rayleigh range to incorporate a quality factor having both axial and transverse components Madd2$M_{{rm{add}}}^2$ and M2. Using geometrical ray tracing simulations, a proportion factor C is found to empirically describe the axial quality factor Mz2$M_z^2$ of an optical setup including an Axicon and a paraxial focusing lens with a Gaussian single mode input beam. Using our M6 formalism depth of focus (DOF) ranges are calculated for higher M2 beams, and are shown to be in good agreement with the simulated DOF range, demonstrating the usefulness of the M6 formalism for the design of real optical systems.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2020-0007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48742609","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}

{"title":"Measurement of ultrashort laser ablation of four metals (Al, Cu, Ni, W) in the single-pulse regime","authors":"T. Genieys, M. Sentis, O. Uteza","doi":"10.1515/aot-2019-0064","DOIUrl":"https://doi.org/10.1515/aot-2019-0064","url":null,"abstract":"Abstract We provide measurements of the ablation of four post-transition and transition metals [aluminum (Al), copper (Cu), nickel (Ni) and tungsten (W)] irradiated by single 800 nm laser pulses, in ultrashort regime from 100 femtosecond (fs) pulse duration down to 15 fs covering a temporal range little explored as yet. For each metal and pulse duration tested, we measured its ablation characteristics (depth and diameter) as a function of incident energy allowing us to determine its laser-induced ablation threshold and ablation rate in a single-shot regime. For all the metals studied, we observed a constant ablation threshold fluence as a function of pulse duration extending this scaling law to pulse duration of few-optical-cycles. We provide evidence of the interest of adjusting the incident fluence to maximize the energy specific ablation depth but also of the absence of any peculiar advantage related to the use of extremely short-pulse duration for ablation purposes. Those informative and detailed ablation data have been obtained in the single-pulse regime and in air ambiance. They can serve as rewarding feedback for further establishing smart strategy for femtosecond laser micromachining and laser damage handling of metallic and metal-based components as well as for enhancing accuracy of modeling of fs laser interaction with metals in ultrashort regime.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2019-0064","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47333683","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}

{"title":"Repellent rings at titanium cylinders against overgrowth by fibroblasts","authors":"Peter Fosodeder, W. Baumgartner, C. Steinwender, A. W. Hassel, C. Florian, J. Bonse, J. Heitz","doi":"10.1515/aot-2019-0070","DOIUrl":"https://doi.org/10.1515/aot-2019-0070","url":null,"abstract":"Abstract The invention of new miniaturized and smart medical implants continues in all medical fields, including miniaturized heart pacemakers. These implants often come with a titanium (Ti) casing, which may have to be removed after several months or years and shall therefore not be completely overgrown by cells or scar tissue after implantation. Scar tissue is mainly formed by fibroblast cells and extracellular matrix proteins like collagen produced by them. Suppression of fibroblast growth at Ti surfaces could be achieved by 800 nm femtosecond laser-ablation creating self-organized sharp spikes with dimensions in the 10 μm-range which are superposed by fine sub-μm parallel ripples. On flat Ti control samples, the best results regarding suppression of cell growth were obtained on spike-structures which were additionally electrochemically anodized under acidic conditions. When Ti cylinders with a diameter of 8 mm (similar as the pacemakers) were placed upright in a culture of murine fibroblasts, a multi-layer cell growth up to a height of at least 1.5 mm occurred within 19–22 days. We have demonstrated that a laser-structured and anodized ring around the Ti cylinder surface is an effective way to create a barrier that murine fibroblasts were not able to overgrow within this time.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2019-0070","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41526558","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}

{"title":"Modification of Ti6Al4V surface properties by combined DLW-DLIP hierarchical micro-nano structuring","authors":"J. Ocaña, D. Huerta-Murillo, A. Lasagni, A. Aguilar‐Morales, S. Alamri, J. Cardoso, Á. García-Beltrán, F. Cordovilla, I. Ángulo","doi":"10.1515/aot-2019-0071","DOIUrl":"https://doi.org/10.1515/aot-2019-0071","url":null,"abstract":"Abstract The use of pulsed laser irradiation techniques has proven to be a clearly effective procedure for the achievement of surface properties modification via micro-/nano-structuration, different conceptual approaches having been the subject of research and extensively reported in the literature. Completing the broad spectrum of applications developed mostly involving the generation of structured surfaces (particularly of metallic materials) with specific contact, friction and wear functionalities, the application of laser sources to the surface structuration of metal surfaces for the modification of their wetability and corrosion resistance properties is considered. The particular problems found for the generation of the appropriate surface microstructure able to replicate the hydrophobic behaviour of some live structures present in nature, their long term stability and their amenability to macroscopic scale are discussed along with innovative methods to generate the required hierarchical micro-/nano-structures by a combination of the DLW and DLIP techniques.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2019-0071","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47766727","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}

{"title":"Materials for D-D-A ternary organic solar cells: an absorption model study","authors":"G. Lewińska","doi":"10.1515/aot-2019-0055","DOIUrl":"https://doi.org/10.1515/aot-2019-0055","url":null,"abstract":"Abstract Heterojunction solar cells based on ternary blends of two donors (absorbers and one acceptor) were investigated using modeling. The Tauc-Lorentz model and experimental absorption spectra of selected compounds were used in the simulations. The optimization process was carried out in this way to maximize the absorption of the system. Poly(3-hexylthiophene-2,5-diyl) (PEHT) was investigated as a first donor, which was mixed respectively with poly(3-octylthiophene-2,5-diyl) (P3OT), coumarin 153, purpurin, fluorescent brightener 184, N-chloroethylene carbazole, and 1,3,6,8 tetrachloro 9n amylocarbazole. Simulations were also performed for the Tauc-Lorentz model.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2019-0055","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45081611","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}

{"title":"Native oxide layer effect on polarization cancellation for mirrors over the visible to near-infrared region","authors":"Suchandra Banerjee, R. Chipman, N. Hagen, Y. Otani","doi":"10.1515/aot-2020-0004","DOIUrl":"https://doi.org/10.1515/aot-2020-0004","url":null,"abstract":"Abstract The presence of native oxide layers on aluminum mirrors can be a nuisance for precision optical design. As the native oxide thickness varies from mirror to mirror, its effect cannot be completely canceled even in the conventional crossed fold mirror geometry. We show how this effect arises and how it can be mitigated, and provide an experimental demonstration in which the residual linear retardance and linear diattenuation are reduced to <0.14° and <0.001, respectively, over the visible and near-infra-red spectral range.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2020-0004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47278192","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}

{"title":"Conference Notes","authors":"A. Thoss","doi":"10.2307/2862589","DOIUrl":"https://doi.org/10.2307/2862589","url":null,"abstract":"THE RENAISSANCE SOCIETY OF AMERICA held its annual conference, celebrating the 25th anniversary of the Centre for Reformation and Renaissance Studies (CRRS), in Toronto, from Thursday, April 5 to Saturday, April 7, 1990. The conference was hosted by Victoria College in the University of Toronto. The 36th annual RSA Council business meeting was held on the afternoon of April 5 th in conjunction with the conference. J. Kelly Sowards (Wichita State U) chaired the Thursday afternoon plenary session on Recent Trends in Renaissance Studies: Education in the Renaissance and Reformation. Paul Grendler (U of Toronto) spoke on \"Schooling in Italy and Beyond\"; Susan Karant-Nunn (Portland State U) on \"Early Modern German Schooling and the 'New History' of Education\"; and Charles Nauert (U of Missouri, Columbia) on \"Humanist Infiltration into the Academic World: Some Studies of Northern Universities.\" Robert Proctor (Connecticut College) was Commentator and spoke on \"The Studia Humanitatis: Contemporary Scholarship and Renaissance Ideals.\" Anthony Grafton (Princeton U) chaired the Thursday evening plenary session, a CRRS 25th Anniversary Panel, on the topic Early Modern Studies: an Agenda for the New Millennium. Germaine Warkentin (Victoria College, U of Toronto) made introductory remarks and introduced a panel consisting of David Wootton (U of Victoria, BC), Jane Abray (U of Toronto), and Debra Shuger (UCLA) who spoke on \"Decanting Theory, or Old Wine in New Bottles.\" Twenty-nine sessions were held with the following topics and papers presented. On Friday, April 6th, Session 1, Sexuality, Satire and Stage Censorship in the English Renaissance, 1599-1604, was organized and chaired by Richard Burt (U of Massachusetts, Amherst). Lynda Boose (Dartmouth College) presented a paper on \"The 1599 Bishops Ban, Elizabethan Pornography and the Sexualization of the Jacobean Stage\"; Richard Burt on \"Critics as Consumers: Sexual Slander and Censorship in Jonson's Epicene\"; and M. Lindsay Kaplan (UC-Berkeley) on \"Satire and the Arraignment of Love Poetry in Jonson's Poetaster.\" Session 2, Renaissance Women from Twentieth-Century Feminist Perspectives: a Modern Walk with Renaissance Notions of Love and Death, was organized by Robert L. Mazzola (U of Connecticut,","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2307/2862589","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46924998","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}

{"title":"Direct femtosecond laser surface structuring with complex light beams generated by q-plates","authors":"J. Nivas, E. Allahyari, S. Amoruso","doi":"10.1515/aot-2019-0067","DOIUrl":"https://doi.org/10.1515/aot-2019-0067","url":null,"abstract":"Abstract Direct femtosecond (fs) laser surface structuring became a versatile way to generate surface structures on solid targets demonstrating a high degree of flexibility and controllability in creating different types of structures for many applications. This approach demonstrated an alteration in various properties of the surface, such as optical properties, wetting response, etc. This paper focuses on direct fs laser surface structuring using complex light beams with spatially variant distribution of the polarization and fluence, with emphasis on the results obtained by the authors by exploiting q-plate beam converters. Although striking scientific findings were achieved so far, direct fs laser processing with complex light fields is still a novel research field, and new exciting findings are likely to appear on its horizon.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2019-0067","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47897042","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}

{"title":"Formation of laser-induced periodic surface structures on different materials: fundamentals, properties and applications","authors":"S. Gräf","doi":"10.1515/aot-2019-0062","DOIUrl":"https://doi.org/10.1515/aot-2019-0062","url":null,"abstract":"Abstract The use of ultra-short pulsed lasers enables the fabrication of laser-induced periodic surface structures (LIPSS) on various materials following a single-step, direct-writing technique. These specific, well-ordered nanostructures with periodicities in the order of the utilised laser wavelength facilitate the engineering of surfaces with functional properties. This review paper discusses the physical background of LIPSS formation on substrates with different material properties. Using the examples of structural colours, specific wetting states and the reduction of friction and wear, this work presents experimental approaches that allow to deliberately influence the LIPSS formation process and thus tailor the surface properties. Finally, the review concludes with some future developments and perspectives related to forthcoming applications of LIPSS-based surfaces are discussed.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2019-0062","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42500068","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}

{"title":"Laser micro- and nano-material processing – Part 1","authors":"J. Bonse, A. Lasagni","doi":"10.1515/aot-2020-0009","DOIUrl":"https://doi.org/10.1515/aot-2020-0009","url":null,"abstract":"This article represents the Editorial for Part 1 of the Special Issue “Laser Micro- and Nano-Material Processing”.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2020-0009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44060213","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}