Key Note Speakers: Prof. Almantas Galvanauskas University of Michigan Prof. Jens Limpert Friedrich Schiller University Prof. Philip Russel Max Planck Institute for the Science of Light Dr. Bryce Samson Nufern Dr. Cesar Jauregui Friedrich Schiller University Prof. Frank Wise Cornell University COHERENT FREQUENCY-DOMAIN AND TIME-DOMAIN WAVEFORM SYNTHESIS - A PATH TO FIBER-ARRAY BASED TW PEAK POWER SOURCES Almantas Galvanauskas Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, Michigan 48109, USA Abstract: Recently developed large-core single-mode fibers enabled a technological basis for compactly integrated optical circuits for high energy pulsed systems. Our experimental work now focuses on exploring new possibilities offered by coherent addition of outputs from an array of such circuits to synthesize pulsed waveforms with ultrashort-duration and high-energy characteristics well beyond those of individual fiber lasers. In this talk I will describe how coherent spectral beam combining, which can overcome gain-narrowing limitations, and coherent multiple-pulse stacking in Gires-Tournois interferometers, which can overcome peak power limitations when fully extracting stored energy, leads to new fiber CPA array architectures capable of achieving multi-TW peak power pulses at kHz repetition rates with a relatively small number of parallel channels. Biography: Professor Almantas Galvanauskas is heading the Ultrafast and High Power Fiber Lasers group at the Electrical Engineering and Computer Science Department, University of Michigan. Almantas Galvanauskas is a professor at the Electrical Engineering and Computer Science Department, University of Michigan. He has been working in the field of fiber lasers for more than twenty years, and has more than 200 publications, including approximately 30 patents and patent applications. He had pioneered ultrashort-pulse fiber CPA, and his work had resulted in demonstrating several record-breaking achievements in performance of fiber lasers. Prior to joining University of Michigan he spent eight years in industrial R&D at IMRA America, Inc.. His current interest spans areas from novel fiber designs to advanced fiber laser systems, including beam combining of pulsed and ultrashort pulse lasers, and new fiber laser applications such as high-intensity laser plasma produced EUV, X-ray generation, and laser driven acceleration. He is also a co-founder of Arbor Photonics, Inc., which was acquired by nLight Inc. in 2012. __________________________________________________________________________ ERFORMANCE SCALING OF FEMTOSECOND FIBER-LASER SYSTEMS (A PATH TO JOULE-CLASS HIGH REPETITION RATE ULTRAFAST LASERS) Jens Limpert Friedrich Schiller University Jena, Institute of Applied Physics, Max-Wien-Platz 1, 07743 Jena, Germany. Abstract: The presentation will review the challenges, achievements and status of ultrashort pulse amplification in rare-earth-doped fibers. Future developments based on coherent combination of fiber-amplified femtosecond pulses can open up a new performance class of ultrafast lasers. Spatially and temporally separated amplification followed by coherent combination might enable the generation of Terawatt-class high repetition rate (>10kHz) fiber laser systems. A potential system design will be presented. Biography: Professor Jens Limpert is heading the Fiber & Waveguide Lasers activity in the Institute of Applied Physics in Friedrich-Schiller-University in Jena, Germany. Jens Limpert was born in Jena, Germany, on 11th of December in 1975. He received his M.S in 1999 and Ph.D. in Physics from the Friedrich Schiller University of Jena in 2003. His research interests include high power fiber lasers in the pulsed and continuous-wave regime, in the near-infrared and visible spectral range. After a one-year postdoc position at the University of Bordeaux, France, where he extended his research interests to high intensity lasers and nonlinear optics, he returned to Jena and is currently leading the Laser Development Group (including fiber- and waveguide lasers) at the Institute of Applied Physics. Together with his colleagues, he has invented novel large-mode-area fiber designs based on micro- and nanostructures. He has also developed novel experimental strategies and, based on these strategies, demonstrated significant power scaling of high repetition rate ultrafast lasers systems, as well as new concepts of optical parametric interaction and high harmonic generation. He is author or co-author of more than 200 peer-reviewed journal papers in the field of laser physics. His research activities have been awarded with the WLT-Award in 2006, an ERC starting grant in 2009 and an ERC consolidator grant in 2013. Jens Limpert is member of the German Physical Society and the Optical Society of America. ___________________________________________________________________________ FREQUENCY CONVERSION VIA ENHANCED LIGHT-MATTER INTERACTIONS IN FIBRE MICROSTRUCTURES Philip Russell Max Planck Institute for the Science of Light Guenther-Scharowsky-Straße 1, 91058 Erlangen, Germany Abstract: Microstructuring offers remarkable opportunities for enhancing light-matter interactions in optical fibres. For example, extreme soliton self-compression of few 1 µJ, 50 fs, 800 nm pulses in gas-filled hollow-core photonic crystal fibre (PCF) leads to shock formation, resulting in generation of wavelength-tunable dispersive waves down to the vacuum-ultraviolet with efficiencies up to ~10% [1,2]. Dispersion-tailored ZBLAN PCFs allow generation of supercontinua extending over three octaves (350 to 2500 nm) from 1 nJ pulses at 1042 nm [3]. Chalcogenide "nano-spike" structures, made by pumping molten glass into silica capillaries at high pressure, can be used to generate coherent frequency combs in the mid-IR from a mode-locked Tm-doped fibre laser at 2 µm [4]. And optical driving of the few-GHz acoustic resonances that exist in solid-core PCF has permitted stable passive mode-locking of a fibre ring laser at its 337th harmonic [5]. 1. K. F. Mak et al: Optics Express 21, 10942–10953 (2013) 2. J. C. Travers et al: J Opt Soc Am B 28, A11–A26 (2011) 3. X. Jiang et al: Advanced Solid-State Lasers (Paris, 2013), postdeadline paper JTh5A.6 4. N. Granzow et al: Optics Express 21, 10969–10977 (2013) 5. M. S. Kang et al: Optics Letters 38, 561–563 (2013) Biography: Professor Philip Russell is a Director at the Max-Planck Institute for the Science of Light (MPL), a position he has held since January 2009 when MPL was founded. He was professor in the Department of Physics at the University of Bath from 1996 to 2005. He obtained his D.Phil. (1979) degree at the University of Oxford, spending three years as a Research Fellow at Oriel College, Oxford. In 1982 and 1983 he was a Humboldt Fellow at the Technical University Hamburg-Harburg (Germany), and from 1984 to 1986 he worked at the University of Nice (France) and the IBM TJ Watson Research Center in Yorktown Heights, New York. From 1986 to 1996 he was based mainly at the University of Southampton. His research interests currently focus on scientific applications of photonic crystal fibres and related structures. He is a Fellow of the Royal Society, the Optical Society of America (OSA) and the UK Institute of Physics and has won several international awards for his research including the 2013 EPS Prize for Research into the Science of Light, the 2005 Körber Prize for European Science, the 2005 Thomas Young Prize of the Institute for Physics (UK) and the 2000 OSA Joseph Fraunhofer Award/Robert M. Burley Prize. He is also OSA's 2014 President-Elect. _________________________________________________________________________________________ RECENT PROGRESS ON FIBER LASERS AND AMPLIFIERS OPERATING AT 1 AND 2micron Bryce Samson, Adrian Carter, and Kanishka Tankala Nufern, 7 Airport Park Road, East Granby, CT 06026 , USA Abstract: The advances in performance of fiber lasers have been dramatic in the last 10 years, making fiber lasers a commercial business worth over $500M/year. All of this is made possible by the unique performance attributes of rare earth doped silica fibers which is at the heart of each of these laser systems. In this talk we will review the key performance parameters of these fibers, such as large mode area (LMA) fibers and their use in high power CW lasers for industrial as well as non-industrial applications. The common rare earth dopants for silica fibers, namely Ytterbium, Erbium, Thulium and Holmium will also be described and fiber lasers operating at “eyesafer” wavelengths around 1.5 and 2mm reviewed Biography: Doctor Bryce Samson is a VP Business Development at Nufern Dr. Samson joined Nufern from Corning where he served as Senior Research Scientist in the areas of doped fibers, fiber amplifiers and fiber lasers. Prior to that, he worked as a Research Fellow at the University of Southampton focusing on novel fibers and fiber device physics. He received his Ph.D. in Physics from Essex University in the UK and his B.S. degree in Applied Physics from Heriot-Watt University in Edinburgh, UK. He is an inventor on several patents in the amplifier and fiber laser field and has been published in numerous industry journals. ___________________________________________________________________________________________ THERMAL EFFECTS AND MODULATION INSTABILITIES IN HIGH-POWER FIBER LASER SYSTEMS Cesar Jauregui Friedrich Schiller University Jena, Institute of Applied Physics, Max-Wien-Platz 1, 07743 Jena, Germany. tel:+49(0)36419-47816 Abstract: In this talk the impact of thermal effects on large mode area fibers in high average power operation will be reviewed. Even though general thermal issues will be described, the main focus of the talk will be on mode instabilities. Thus, the most recent progress in this topic including its physical origin, the degradation of the threshold with time and mitigation strategies will be presented and discussed. ________________________________________________________________________________________ HIGH-PERFORMANCE FEMTOSECOND FIBER LASERS BASED ON NEW PULSE EVOLUTIONS Frank Wise Department of Applied Physics, Cornell University. 271 Clark Hall, Ithaca, NY 14853-3501. USA Abstract: The femtosecond lasers that underlie ultrafast science and technology are based on solitons pulses that balance anomalous dispersion and nonlinearity. Solitons offer attractive features, but their energy is limited, and this limitation is particularly challenging in fiber lasers. Recently, a new class of pulses that form with normal dispersion has been identified. These are referred to as dissipative solitons. Short-pulse fiber lasers based on them generate pulses with 30 times the energy of prior fiber lasers, and much-higher energies may be possible. Dissipative-soliton lasers can exceed the performance of solid-state lasers while offering the major practical benefits of the waveguide medium. Theoretical and experimental results on dissipative-soliton lasers will be presented. Dissipative processes can also be used to stabilize self-similar evolution of parabolic pulses (similaritons) in a laser. In contrast to dissipative solitons, similaritons exhibit strong temporal and spectral breathing as they traverse a laser. Similaritons are nonlinear attractors in gain fiber, and ways to exploit this property will be discussed. Dissipative-soliton and similariton lasers offer high performance with simple designs, and so should have significant impact on short-pulse science and technology in the future. Biography: Professor Frank Wise is a Director of Graduate Studies at the School of Applied and Engineering Physics in Cornell University. Professor Wise is heading a group working on fiber lasers, semiconductor nanocrystals and ultrafast optical physics Frank Wise received a BS in Engineering Physics from Princeton University, an MS in Electrical Engineering from the University of California at Berkeley, and a PhD in Applied Physics from Cornell University. Before PhD studies at Cornell, he worked on advanced integrated circuits at Bell Laboratories. Since receiving the PhD in 1989, he has been on the faculty in Applied Physics at Cornell. His group has efforts in nonlinear pulse propagation and semiconductor nanostructures. Since 2002 his group has been working on fiber lasers.


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