제 목: High-power fiber lasers: from materials processing to high-energy physics

연 사: Prof. Johan Nilsson

소 속: University of Southampton, UK

시 간: 2012년 10월 30일 (화요일) 오후 4시

장 소: 제1 신공학관 (301동) 204호

Abstract

The last decade has seen fiber lasers, in particular those doped with ytterbium, establish themselves as front runners for many important laser applications such as materials processing. For that, cost, efficiency, and reliability are key requirements. Fiber lasers are able to meet these requirements largely thanks to their foundation in telecom and to the tight focusing over extended lengths possible with waveguiding devices. Thus, remarkably, the same fundamental principles and technology developed for telecom fiber amplifiers at the 100 mW level still work for powers that are up to five orders of magnitude higher, as required for materials processing. There are now plans to increase the average power by a further 3 - 4 orders of magnitude, in the femtosecond regime, using beam combination schemes. The application in this case is high-energy physics. I will discuss the recent progress and requirements for this extremely demanding application, which again include efficiency, cost, and reliability.

Biography

Johan Nilsson is Professor of Optoelectronics at the Optoelectronics Research Centre (ORC), University of Southampton. There, he leads a research group on high power fibre lasers. His main areas of interests are guided-wave lasers and amplifiers, nonlinear optics, fibre optics, and optical communications. His research has covered system, fabrication, and materials aspects of guided-wave lasers and amplifiers, and in particular device aspects of high power fibre lasers and erbium-doped fibre amplifiers.

Johan received the doctorate degree in engineering science from Kungliga Tekniska Högskolan (KTH), Stockholm, Sweden, in 1994, for research on optical amplification. He then joined Samsung Electronics in Kiheung, Korea, where he worked for two years on erbium-doped fibre amplifier for WDM and CATV systems. Since then, after joining ORC, his work has focussed on high-power lasers and has led to a number of ground-breaking results and demonstrations such as the first kW-level near diffraction-limited fibre laser and high-power narrow-line fibre sources for phased-array lasers.

Throughout his career, Johan has worked in close collaboration with local as well as global industry. He is a co-founder of Southampton Photonics, and remains a consultant to them in their current form (SPI Lasers, a fully-owned subsidiary of TRUMPF).

His work has resulted in 300 scientific publications, several patents, and a large number of presentations, including key presentations at leading conferences. In recognition of his contributions to high-power fibre lasers, Johan was elected fellow of the Optical Society of America (OSA). He is also a current or past member of several conference committees, including the leading Fiber Laser Systems Technology and Applications conference at Photonics West, which he has chaired. Furthermore he has chaired the Laser Science and Engineering technical group in OSA’s Science and Engineering Council. He was a guest editor of the IEEE Journal Selected Topics of Quantum Electronics Special issues on high power fiber lasers and applications in 2009 and is currently on the advisory editorial board of the Journal of the Optical Society of Korea. He is also the SPIE advisor for ORC’s Student Chapter.