INSTITUTE OF APPLIED PHYSICS - IAP sciencist looks forward for a research stay in Japan

IAP sciencist looks forward for a research stay in Japan

Sören Richter, PhD student of the Institute and the Hans L. Merkle Foundation (Robert Bosch GmbH) visits the Graduate School of Engineering, Osaka, Japan, from 15.10. - 14.12.2012 in order to use local experiences and experimental assemblies for his thesis.

In January this year, the junior researcher was participating at the world's largest photonics conference (Photonics West) in San Francisco and drew attention to the work of Prof. Kazuyoshi Itoh. Like the German physicist, the Japanese Research Unit at the Graduate School of Engineering also deal with temperature distribution in glass when ultrashort laser pulses were inscribed. A contact was made and a funding from the DAAD and the Japan Society of Promotion of Science (JSPS) quickly realized.
"Due to its excellent mechanical, chemical and optical properties glass
represents an extraordinary material. Since the last few years, the processing and modification of glass with ultrashort laser pulses has been developed to a complex and broad field of research. The type of modification depends on both the used laser parameters and the material. "says Sören Richter. "Ultrashort pulses lead to extreme non-equilibrium states by interaction with matter. Thus it offers a high potential basic for research and applications. The high power densities in transparent materials can cause permanent, local modifications, the running mechanisms are still not fully understood "And that's the point of interest in his doctoral thesis -  a fundamental understanding of the interaction of ultrashort laser pulses with transparent materials with high repetition rates, as well as the processes and parameters during the laser welding and at the evolution of nano-gratings.
Here, Sören Richter will draw on an experimental set-up at the Institute in Osaka, with it the laser-induced temperatures can be local and time-resolved measured in the modified volume. However, until now only the temperature distribution after single-pulse excitation have been analyzed, so that the young scientist will modify the set-up in that way that
the heat accumulation of thousands of ultra-short laser pulses can be measured.

"The hereby expected results will provide new insights into the process of interaction of ultrashort laser pulses  with transparent materials. Because there are still no reliable information on what temperatures can actually achieved in the laser focus by heat accumulation. "explains the physicist. For the design of future optical components it is fundamental: while the precise temperature distribution is known, it can not only be calculated the induced stresses, but also explain other effects, such as periodic formation of vacancies or the possibility of the formation of nano-gratings.
Naturally, however, there is also great anticipation to a completely different culture and to work with the Japanese counterparts.

Prof. Dr. Stefan Nolte
Institute of Applied Physics at the Friedrich-Schiller-University Jena
Max-Wien-Platz 1, 07743 Jena
Phone: 03641/947820
Email: stefan.nolte @

News from: 25.09.2012 15:54
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