Thursday, June 25, 2015

Seminar: "Pushing the limits in glass properties and structures for laser, sensing and nonlinearity applications by Dr. Heike Ebendorff-Heidepriem 7.10.15/12:00-1:00pm/ CREOL RM 103

Seminar: "Pushing the limits in glass properties and structures for laser, sensing and nonlinearity applications by Dr. Heike Ebendorff-Heidepriem
Friday, July 10, 2015 12:00 PM to 1:00 PM
CREOL Room 103

Celebrating the International Year of Light 2015
Heike Ebendorff-Heidepriem
Associate Professor 
Centre for Nanoscale BioPhotonics, Institute for Photonics and Advanced Sensing,
The University of Adelaide, Australia 

Speciality optical fibres are of growing interest for a diverse applications including lasing, sensing and nonlinear processing. Both glass properties and fibre structures are used to tailor the fibre properties. Hence, there is increasing demand for creating novel glass properties and new structures to improve and extend fibre performance. In addition to optical properties, thermomechanical properties play a key role in the suitability of glasses for practical applications. This talk reviews the progress in pushing the limits in glass properties and fabrication of fibre structures.
Depending on their glass composition, glasses exhibit a wide range of optical properties such as linear refractive indices of 1.4-2.8, nonlinear refractive indices spanning three order of magnitude over of 1017-1020 m2/W and transmission windows that are situated within 200nm – 20┬Ám. Recently, incorporation of nanocrystals such as nanodiamond has gained significant attention as a pathway to add functionality to glass.
The glass fabrication conditions have a significant impact on the material loss of glass. For example, large amount of research has been dedicated to reduce water content in heavy metal oxide glasses to access the intrinsic infrared transmission of these glasses.
A range of techniques has been used to fabricate nano/microstructured fibres. Recent progress in extrusion has extended significantly the range of fibre structures that have been made as well as the range of materials that have been exploited for fibre fabrication. In addition, ultrasonic drilling and milling of preforms opened up new structures. Another technique to create microstructure into glass is direct laser writing of regions with modified refractive index. This technique enabled creation of low-loss waveguide into ZBLAN fluoride glass.
The talk will also present opportunities of different glasses and structures for diverse range of applications spanning fluoroindate fibres for mid-infrared transmission, fluorozirconate waveguides as chip lasers, tellurite microspheres for nanoparticle sensing, heavy metal oxide glass fibres for nonlinear optical processing, suspended and exposed core fibres for different sensing platforms.

Heike Ebendorff-Heidepriem received the Ph.D. degree in chemistry from the University of Jena, Germany, in 1994. She subsequently held two prestigious fellowships and was received the Weyl International Glass Science Award. During 2001-2004 she was with the Optoelectronics Research Centre at the University of Southampton, UK. Since 2005, she has been with the University of Adelaide, Australia. Currently, she is one of the leaders of the Optical Materials & Structures Theme and the Deputy Director of the Institute for Photonics & Advanced Sensing. Her research focuses on the development of novel optical glasses, fibres, surface functionalization and sensing approaches.

For additional information:
Guang-Ming "Derek" Tao

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