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| 1 | 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 |
| 2 | 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 |
| 3 | Enhancing precision in fs-laser material processing by simultaneous spatial and temporal focusing显示文摘In recent years,femtosecond(fs)-lasers have evolved into a versatile tool for high precision micromachining of transparent materials because nonlinear absorption in the focus can result in refractive index modifications or material disruptions.However,when high pulse energies or low numerical apertures are required,nonlinear side effects such as self-focusing,filamentation or white light generation can decrease the modification quality.In this paper,we apply simultaneous spatial and temporal focusing(SSTF)to overcome these limitations.The main advantage of SSTF is that the ultrashort pulse is only formed at the focal plane,thereby confining the intensity distribution strongly to the focal volume and suppressing detrimental nonlinear side effects.Thus,we investigate the optical breakdown within a water cell by pump-probe shadowgraphy,comparing conventional focusing and SSTF under equivalent focusing conditions.The plasma formation is well confined for low pulse energies,2 mJ,but higher pulse energies lead to the filamentation and break-up of the disruptions for conventional focusing,thereby decreasing the modification quality.In contrast,plasma induced by SSTF stays well confined to the focal plane,even for high pulse energies up to 8 mJ,preventing extended filaments,side branches or break-up of the disruptions.Furthermore,while conventional focusing leads to broadband supercontinuum generation,only marginal spectral broadening is observed using SSTF.These experimental findings are in excellent agreement with numerical simulations of the nonlinear pulse propagation and interaction processes.Therefore,SSTF appears to be a powerful tool to control the processing of transparent materials,e.g.,for precise ophthalmic fs-surgery. | Robert Kammel Roland Ackermann Jens Thomas Jorg Gotte Stefan Skupin Andreas Tunnermann Stefan Nolte | 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 | 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 |
| 6 | The renaissance and bright future of fiber lasers显示文摘 | Tunnermann A Schreiber T Roser F | 2005 | J Phys B At Mol Opt Phys2005，38，： | 1 |
| 7 | Origins of waveguiding in femtoseeond laser-structured LiNbO3显示文摘 | J Burghoff S Nolte A Tunnermann | 2007 | Appl Phys A2007，89，1： | 1 |
| 8 | 查看详情显示文摘 | Thomas J Wikszak E clausnitzer T Fuchs U Zeitner U Nolte S Tunnermann A | | 0，，： | 1 |
| 9 | Quasithree-level room temperature Nd : YAG ring laser with high single-frequency output power at 946 nm 显示文摘 | Freitag I Henking R Tunnermann A | 1995 | Optics Letters1995，20，4： | 1 |
| 10 | 查看详情显示文摘 | D Golla S Knoke W Schone G Ernst M Bode A Tunnermann H Welling | | 0，，： | 1 |
| 11 | Frequencytunable 500 mW continuous-wave all-solid-state single-frequency source in the blue spectral region显示文摘 | Bode M Freitag I Tunnermann A | 1997 | Optics Letters1997，22，16： | 1 |
| 12 | Electro-optical frequency modulation of an external-cavity diode laser显示文摘 | Laschek M Wandt D Tunnermann A | 1998 | Optics Communications1998，153，5： | 1 |
| 13 | 查看详情显示文摘 | Bruckner C Pradarutti B Stenzel O Steinkopf R Riehemann S Notni G Tunnermann A | | 0，，： | 1 |
| 14 | Origins of waveguid- ing in femtosecond laser-structured LiNbO3 显示文摘 | BURGHOFF J NOLTE S TUNNERMANN A | 2007 | Applied Physics2007，89，1： | 1 |
| 15 | Functionalisation of PL- LA nanofiber scaffolds using a possible cooperative effect between collagen type I and BMP -2:impact on colonization and bone forma- tion in vivo显示文摘 | Schofer MD Tunnermann L Kaiser H | 2012 | J Mater Sci Mater Med2012，23，： | 1 |
| 16 | 查看详情显示文摘 | Bruckner C Kasebier T Pradarutti B Riehemann S Notni G Kley E Tunnermann A | | 0，，： | 1 |
| 17 | Power scaling of diode-pumped monolithic Nd : YAG lasers to output powers of several watts显示文摘 | FREITAG I TUNNERMANN A WELLING H | 1995 | Optics Comunications1995，115，56： | 1 |
| 18 | Fiber lasers andamplifiers:an ultrafast performance evolution显示文摘 | A Tunnermann T Schreiber J Limpert | | 0，，25： | 1 |
| 19 | Quasi three-level room-temperature Nd : YAG ring laser with high single-frequency output power at 946nm显示文摘 | FREITAG I HENKING R TUNNERMANN A | 1995 | Opt Lett1995，20，24： | 1 |
| 20 | Passively Q- switched Nd : YAG ring lasers with high average output power in single-frequency operation 显示文摘 | FREITAG I TUNNERMANN A WELLING H | 1997 | Opt Lett1997，22，10： | 1 |
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