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| 1 | Petawatt and exawatt class lasers worldwide显示文摘In the 2015 review paper‘Petawatt Class Lasers Worldwide’a comprehensive overview of the current status of highpower facilities of>200 TW was presented.This was largely based on facility specifications,with some description of their uses,for instance in fundamental ultra-high-intensity interactions,secondary source generation,and inertial confinement fusion(ICF).With the 2018 Nobel Prize in Physics being awarded to Professors Donna Strickland and Gerard Mourou for the development of the technique of chirped pulse amplification(CPA),which made these lasers possible,we celebrate by providing a comprehensive update of the current status of ultra-high-power lasers and demonstrate how the technology has developed.We are now in the era of multi-petawatt facilities coming online,with 100 PW lasers being proposed and even under construction.In addition to this there is a pull towards development of industrial and multi-disciplinary applications,which demands much higher repetition rates,delivering high-average powers with higher efficiencies and the use of alternative wavelengths:mid-IR facilities.So apart from a comprehensive update of the current global status,we want to look at what technologies are to be deployed to get to these new regimes,and some of the critical issues facing their development. | Colin N.Danson Constantin Haefner Jake Bromage Thomas Butcher Jean-Christophe FChanteloup Enam A.Chowdhury Almantas Galvanauskas Leonida A.Gizzi Joachim Hein David I.Hillier Nicholas W.Hopps Yoshiaki Kato Efim A.Khazanov Ryosuke Kodama Georg Korn Ruxin Li Yutong Li Jens Limpert Jingui Ma Chang Hee Nam David Neely Dimitrios Papadopoulos Rory R.Penman Liejia Qian Jorge J.Rocca andrey A.Shaykin Craig W.Siders Christopher Spindloe Sándor Szatmári Raoul M.G.M.Trines Jianqiang Zhu Ping Zhu Jonathan D.Zuegel | 2019 | High Power Laser Science and Engineering2019，7，3： | 33 |
| 2 | Yb-doped large-pitch fibres: effective single-mode operation based on higher-order mode delocalisation显示文摘Rare earth-doped fibres are a diode-pumped,solid-state laser architecture that is highly scalable in average power.The performance of pulsed fibre laser systems is restricted due to nonlinear effects.Hence,fibre designs that allow for very large mode areas at high average powers with diffraction-limited beam quality are of enormous interest.Ytterbium-doped,rod-type,large-pitch fibres(LPF)enable extreme fibre dimensions,i.e.,effective single-mode fibres with mode sizes exceeding 100 times the wavelength of the guided radiation,by exploiting the novel concept of delocalisation of higher-order transverse modes.The non-resonant nature of the operating principle makes LPF suitable for high power extraction.This design allows for an unparalleled level of performance in pulsed fibre lasers. | Jens Limpert Fabian Stutzki Florian Jansen Hans-Jurgen Otto Tino Eidam Cesar Jauregui Andreas Tunnermann | 2012 | Light(Science & Applications)2012，1，1： | 16 |
| 3 | A concept for multiterawatt fibre lasers based on coherent pulse stacking in passive cavities显示文摘Since the advent of femtosecond lasers,performance improvements have constantly impacted on existing applications and enabled novel applications.However,one performance feature bearing the potential of a quantum leap for high-field applications is still not available:the simultaneous emission of extremely high peak and average powers.Emerging applications such as laser particle acceleration require exactly this performance regime and,therefore,challenge laser technology at large.On the one hand,canonical bulk systems can provide pulse peak powers in the multi-terawatt to petawatt range,while on the other hand,advanced solid-state-laser concepts such as the thin disk,slab or fibre are well known for their high efficiency and their ability to emit high average powers in the kilowatt range with excellent beam quality.In this contribution,a compact laser system capable of simultaneously providing high peak and average powers with high wall-plug efficiency is proposed and analysed.The concept is based on the temporal coherent combination(pulse stacking)of a pulse train emitted from a high-repetition-rate femtosecond laser system in a passive enhancement cavity.Thus,the pulse energy is increased at the cost of the repetition rate while almost preserving the average power.The concept relies on a fast switching element for dumping the enhanced pulse out of the cavity.The switch constitutes the key challenge of our proposal.Addressing this challenge could,for the first time,allow the highly efficient dumping of joule-class pulses at megawatt average power levels and lead to unprecedented laser parameters. | Sven Breitkopf Tino Eidam Arno Klenke Lorenz von Grafenstein Henning Carstens Simon Holzberger Ernst Fill Thomas Schreiber Ferenc Krausz Andreas Tunnermann Ioachim Pupeza Jens Limpert | 2014 | Light(Science & Applications)2014，3，1： | 11 |
| 4 | Watt-scale super-octave mid-infrared intrapulse difference frequency generation显示文摘The development of high-power,broadband sources of coherent mid-infrared radiation is currently the subject of intense research that is driven by a substantial number of existing and continuously emerging applications in medical diagnostics,spectroscopy,microscopy,and fundamental science.One of the major,long-standing challenges in improving the performance of these applications has been the construction of compact,broadband mid-infrared radiation sources,which unify the properties of high brightness and spatial and temporal coherence.Due to the lack of such radiation sources,several emerging applications can be addressed only with infrared(IR)-beamlines in largescale synchrotron facilities,which are limited regarding user access and only partially fulfill these properties.Here,we present a table-top,broadband,coherent mid-infrared light source that provides brightness at an unprecedented level that supersedes that of synchrotrons in the wavelength range between 3.7 and 18μm by several orders of magnitude.This result is enabled by a high-power,few-cycle Tm-doped fiber laser system,which is employed as a pump at 1.9μm wavelength for intrapulse difference frequency generation(IPDFG).IPDFG intrinsically ensures the formation of carrierenvelope-phase stable pulses,which provide ideal prerequisites for state-of-the-art spectroscopy and microscopy. | Christian Gaida Martin Gebhardt Tobias Heuermann Fabian Stutzki Cesar Jauregui Jose Antonio-Lopez Axel Schulzgen Rodrigo Amezcua-Correa Andreas Tunnermann Ioachim Pupeza Jens Limpert | 2018 | Light(Science & Applications)2018，7，1： | 8 |
| 5 | Modal energy transfer by thermally induced refractive index gratings in Yb-doped fibers显示文摘Thermally induced refractive index gratings in Yb-doped fibers lead to transverse mode instability(TMI)above an average power threshold,which represents a severe problem for many applications.To obtain a deeper understanding of TMI,the evolution of the strength of the thermally induced refractive index grating with the average output power in a fiber amplifier is experimentally investigated for the first time.This investigation is performed by introducing a phase shift between the refractive index grating and modal interference pattern,which is obtained by applying a pump power variation to the fiber amplifier.It is demonstrated that the refractive index grating is sufficiently strong to enable modal energy coupling at powers that are significantly below the TMI threshold if the induced phase shift is sufficiently large.The experiments indicate that at higher powers,the refractive index grating becomes more sensitive to such phase shifts,which will ultimately trigger TMI.Furthermore,the experimental results demonstrate beam cleaning above the TMI threshold via the introduction of a positive phase shift.This finding paves the way for the development of a new class of mitigation strategies for TMI that are based on controlling the phase shift between the thermally induced refractive index grating and modal interference pattern. | Christoph Stihler Cesar Jauregui Andreas Tünnermann Jens Limpert | 2018 | Light(Science & Applications)2018，7，1： | 5 |
| 6 | Exploring new avenues in high repetition rate table-top coherent extreme ultraviolet sources显示文摘The process of high harmonic generation(HHG)enables the development of table-top sources of coherent extreme ultraviolet(XUV)light.Although these are now matured sources,they still mostly rely on bulk laser technology that limits the attainable repetition rate to the low kilohertz regime.Moreover,many of the emerging applications of such light sources(e.g.,photoelectron spectroscopy and microscopy,coherent diffractive imaging,or frequency metrology in the XUV spectral region)require an increase in the repetition rate.Ideally,these sources are operated with a multi-MHz repetition rate and deliver a high photon flux simultaneously.So far,this regime has been solely addressed using passive enhancement cavities together with low energy and high repetition rate lasers.Here,a novel route with significantly reduced complexity(omitting the requirement of an external actively stabilized resonator)is demonstrated that achieves the previously mentioned demanding parameters.A krypton-filled Kagome photonic crystal fiber is used for efficient nonlinear compression of 9 μJ,250 fs pulses leading to,7 μJ,31 fs pulses at 10.7 MHz repetition rate.The compressed pulses are used for HHG in a gas jet.Particular attention is devoted to achieving phase-matched(transiently)generation yielding.10^(13) photons s^(-1)(.50 μW)at 27.7 eV.This new spatially coherent XUV source improved the photon flux by four orders of magnitude for direct multi-MHZ experiments,thus demonstrating the considerable potential of this source. | Steffen Hadrich Manuel Krebs Armin Hoffmann Arno Klenke Jan Rothhardt Jens Limpert Andreas Tunnermann | 2015 | Light(Science & Applications)2015，4，1： | 4 |
| 7 | High-power air- clad large-mode-area photonic crystal fiber laser显示文摘 | Limpert J | 2003 | Optics Express2003，11，7： | 2 |
| 8 | Microdrilling of Metals with an Inexpensive and Compact Ultra-short-pulse Fiber Amplified Microchip Laser显示文摘 | Ancona A Nodop D Limpert J | 2009 | Applied Physics A: Materials Science Processing2009，94，1： | 1 |
| 9 | High-power air-clad large-mode-area photonic crystal fibre laser显示文摘 | Limpert J Schreiber T Nolter S | | 0，，： | 1 |
| 10 | 100W average-power, high-energy nanosecond fiber amplifier 显示文摘 | LIMPERT J HUFER S LIEM A | 2002 | Appl Phys2002，75，45： | 1 |
| 11 | High - power picosecond fiber amplifier based on nonlinear spectral compression 显示文摘 | Limpert J Deguil -Robin N Manek -Honinger I | 2005 | Opt Lett2005，30，7： | 1 |
| 12 | Thermo-optical properties of air-clad photonic crystal fiber lasers in high power operation显示文摘 | LIMPERT J SCHREIBER T LIEM A | 2003 | Optics Express2003，11，22： | 1 |
| 13 | Extended singlemode photonic crystal fiber lasers 显示文摘 | LIMPERT J SCHMIDT O ROTHHARDT J | 2006 | Optics Express2006，14，7： | 1 |
| 14 | All fiber chirped-pulse amplification system based on compression in air-guiding photonic bandgap fiber显示文摘 | LIMPERT J SCHREIBER T NOLTE S | 2003 | Optics Express2003，11，24： | 1 |
| 15 | Extended single-mode photonic crystal fiber lasers 显示文摘 | LIMPERT J SCHMIDT O ROTHHARD J | 2006 | Opt Express2006，14，7： | 1 |
| 16 | 500 W continuous wave fiber laser with excellent beam quality显示文摘 | LIMPERT J IAEM A ZELLMER H | 2003 | IEEE Electron Lett2003，39，8： | 1 |
| 17 | 500 W continuous-wave fibre laser with excellent beam quality显示文摘 | Limpert J Liem A Zellmer H | 2003 | Electron Lett2003，39，： | 1 |
| 18 | Extended single-mode photonic crystal fiber lasers 显示文摘 | Limpert J Schmidt O Rothhardt J | 2006 | Optics Ex- press2006，14，7： | 1 |
| 19 | High power air-clad large-mode-area photonic crystal fiber laser显示文摘 | J Limpert T Schreiber S Nolte | 2003 | Opt Express2003，11，7： | 1 |
| 20 | Angioimmunoblastic lymphadenopathy:clinical and radiological features显示文摘 | Limpert J MacMahon H Variakojis D | 1984 | Radiology1984，152，1： | 1 |
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