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Friday, January 29, 2016
LPTH Press Release: LightPath Technologies Adjourns Annual Meeting Until February 25
Thursday, January 14, 2016
LPTH Press Release: LightPath Technologies Exhibiting at SPIE Photonics West 2016
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Tuesday, January 12, 2016
Seminar: "Transparent glass-ceramics for photonics applications produced by melting and sol-gel" by Dr. Maria Jesus Pascual 1.21.16/11:00am-12:00pm/ CREOL RM 103
Seminar: "Transparent glass-ceramics for photonics applications produced by melting and sol-gel" by Dr. Maria Jesus Pascual
Thursday, January 21, 2016 11:00 AM to 12:00 PM
CREOL Room 103
CREOL Room 103
G.Gorni 1, S.Pelli2, J.J. Velázquez1, Y.Castro1 , A.Durán1, R.Balda3, M.J. Pascual1
1Ceramics and Glass Institute (CSIC), Madrid, Spain
2MDF Lab, Applied Physics Institute Nello Carrera (IFAC-CNR), Firenze, Italy
3Applied Physics Dept. I, Superior School of Engineering, Bilbao, Spain
Abstract:
Transparent oxyfluoride nano-glass-ceramics doped with RE ions are very interesting materials for photonics applications. They combine the good mechanical, chemical and thermal stability of oxide glasses with the fluoride crystals, very good host for RE ions and suitable for optical properties due to their low phonon energies. The processing route is a key issue for a suitable preparation of these materials. The typical glass processing method is the melting–quenching (MQ) but the sol-gel (SG) method is a promising alternative. MQ requires high melting temperatures with a limitation in the fluorine content. However, bulk materials and fibers can be easily obtained. SG is a cheap and low-temperature technique that allows a better control of composition and doping level. SG materials have high homogeneity and purity. Thin film can be easily obtained but bulk materials are difficult to prepare and fiber.
Oxyfluoride glass-ceramics with LaF3 nanocrystals obtained by MQ and SG will be presented as study example of the processing parameters. Doping with Pr3+/Yb3+ has been used to study the down-conversion process and also doping with Nd3+ to study the laser emission properties. The crystallization process has been described using DTA taking into account the effect of the dopants. The glass-ceramics were also studied by XRD and HR-TEM. Finally, the relation between processing-structure-optical properties of these materials is discussed.
Biography:
Doctor in Chemistry (2000) from Autónoma University of Madrid (UAM), Spain. Tenured Scientist in the Glass Department of the Ceramics and Glass Institute (ICV) of the Spanish Research Council (CSIC) since 2007. She has carried post-doctoral stages in Otto-Schott Institute Jena (Germany), RWTH Aachen (Germany), Aveiro University (Portugal), UFSCar and UEPG (Brazil). Secretary of the Glass Section of the SECV (Spanish Society of Ceramic and Glass) since 2008. Gottardi Prize in 2010 given by the International Commission on Glass (ICG). Current ICG Treasurer.
Research interests:
- Glasses and glass-ceramics: melting, thermal properties, phase separation, crystallization, sintering…
- Glass sealing materials for low and high temperature devices.
- Glass-ceramics with nanocrystals for photonic applications.
Ceramics and Glass Institute (CSIC): www.icv.csic.es
Research group GlaSS: http://glass.icv.csic. es/index.php
For additional information:
Prof. Kathleen Richardson
Friday, December 11, 2015
George Stegeman Memorial Symposium, January 7-8, 2016
To honor Prof. George I. Stegeman’s seminal contributions in optics, CREOL is organizing a memorial symposium this coming January (January 7-8, 2016) at the University of Central Florida. This symposium will give an opportunity to his many colleagues and friends to celebrate his legacy. We will be delighted if you could join us in this event.
For more information, please visit our website at http://www.creol.ucf.edu/ NewsEvents/EventDetail.aspx? EventID=1113
Please register and print your parking pass at http://www.creol.ucf.edu/ NewsEvents/EventRegistration. aspx?EventID=1113
Best regards,
Bahaa Saleh
CREOL, The College of Optics and Photonics
University of Central Florida
4000 Central Florida Blvd.
Orlando, FL 32816-2700
(407) 882-3326
CREOL, The College of Optics and Photonics
University of Central Florida
4000 Central Florida Blvd.
Orlando, FL 32816-2700
(407) 882-3326
Tuesday, December 1, 2015
Seminar: "Glasses for Photonics and Specialty Optical Fibres Group at the Politecnico di Torino" by Professor Monica Ferraris 1.22.16/10:00am-11:00am/ CREOL RM 102/103
Seminar: "Glasses for Photonics and Specialty Optical Fibres Group at the Politecnico di Torino" by Professor Monica Ferraris
Friday, January 22, 2016 10:00 AM to 11:00 AM
CREOL Room 102/103
CREOL Room 102/103
Professor Monica Ferraris
Politecnico di Torino
ABSTRACT:
The activity on new glasses for photonics and sensing done at Politecnico di Torino during the past 20 years will be briefly reviewed and discussed. In particular, examples will be given on soft glass optical fibers for several applications, ranging from optical fiber lasers and amplifiers to supercontinuum generation and remote sensing/switching applications. Examples of passive and active tellurite glasses and optical fibers for telecom, sensing and Red-Green-Blue sources and rare earth doped phosphate glasses and optical fibersfor short pulsed fiber lasers will be presented. Soft glasses are prepared by melt quenching technique in a controlled atmosphere furnace and then cast on brass molds. The preforms are fabricated by rod-in-tube technique with the tubes manufactured using the rotational casting technique. Specialty optical fibers are fabricated by preform drawing carried out using an in-house custom optical fiber drawing tower. In-line measurement of fiber diameter and tension has enabled stable and reproducible optical fibers suitable for the demonstration of amplification and laser activity.
Some cross-cutting activities have been recently started dealing with the design and fabrication of bioresorbable optical fibres for diagnosis and therapy and with RF co-sputtering of metal nanocluster doped silica thin films for antiseptic and/or bio-sensing application. Preliminary results will be reported.
BIOGRAPHY:
Prof. Monica Ferraris received a M.S. in Chemistry in 1985 from the University of Torino, Italy. In 1985 she joined the Italian Telecom Research Centre (CSELT-Torino) to work on fluoride glasses for ultra low loss optical fibers. In 1990 she moved to Fiat Research Centre (CRF-Torino) where she worked on metal and ceramic matrix composites for automotive applications. She joined Politecnico di Torino in 1991, where she is now full Professor of Materials Science and Technology (since 2005) and group leader (http://www.composites.polito. it). Her academic and research interests are focused on glasses, ceramics and composites for several applications including photonics, medical applications, waste management, joining and coating for energy production and transports.
CONTACT:
Prof. Kathleen Richardson
Monday, November 23, 2015
TOMORROW! Seminar: "Optical Metamaterials: from Linear Responses to Nonlinear Interactions and beyond" by Wenshan Cai 11.24.15/11:00am-12:00pm/ CREOL RM 103
Seminar: "Optical Metamaterials: from Linear Responses to Nonlinear Interactions and beyond" by Wenshan Cai
Tuesday, November 24, 2015 11:00 AM to 12:00 PM
CREOL Room 103
CREOL Room 103
Celebrating the International Year of Light 2015
Abstract:
Nanostructured metals have provided us with a unique opportunity to manipulate light in an unconventional manner. Collectively, subwavelength metallic structures serve as building blocks for optical metamaterials with properties that were not observed or even speculated about in the past. This is a very exciting frontier in optics and materials science, with the promising goal of yielding better solar cells, faster computer chips, ultrasensitive biochemical detectors, and even invisible devices. While metamaterials are commonly viewed as artificially-structured media capable of realizing exotic electromagnetic properties, we can drive beyond this limited vision and explore the use of optical metamaterials as a generalizable platform for optoelectronic information technology. In this talk I will start with a general description of metamaterials in the conventional linear regime, include experimental demonstrations of the first magnetic metamaterial across the entire visible spectrum, and the world’s first negative-index material at optical frequencies. In the second half of the talk I will steer towards nonlinear light-matter interactions in optical metamaterials, including the electrically induced harmonic generation and optical rectification of light in a perfect metamaterial absorber, the nonlinear spectroscopy and imaging of a chiral metamaterial, and the backward phase-matching in an optical metamaterial where the fundamental and frequency-doubled waves possess opposite indices of refraction.
Biography
Wenshan Cai is an Associate Professor in Electrical and Computer Engineering at the Georgia Institute of Technology, with a joint appointment in Materials Science and Engineering. Prior to joining Georgia Tech in 2012, he was a postdoctoral fellow in the Geballe Laboratory for Advanced Materials at Stanford University. Dr. Cai received his B.S. and M.S. degrees from Tsinghua University in 2000 and 2002, respectively, and his Ph.D. from Purdue University in 2008. His scientific research is in the area of nanophotonic materials and devices, in which he has made a major impact on the evolving field of plasmonics and metamaterials. Dr. Cai has published ~40 journal papers in highly prestigious journals such as Science, Nature Materials, Nature Photonics, Nature Nanotechnology, Nature Communications, etc., and the total citations of his papers have reached over 6,000 within the past few years. He serves as a reviewer or an editorial board member for over 20 scientific journals. In addition, Dr. Cai is the lead author of the book Optical Metamaterials: Fundamentals and Applications, a text used at many universities around the world, for which he won the 2014 Joseph W. Goodman Book Writing Award from OSA and SPIE.
For additional information:
Dr. Mercedeh Khajavikhan
Tuesday, October 13, 2015
LightPath Technologies Schedules Fiscal 2016 First Quarter Financial Results Conference Call for November 5
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