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Spectrally tunable high-power Yb:fiber chirped-pulse amplifier

Photonics Research 2022年第10期10卷 2309-2316页

作者： valentina shumakova VITO F.PECILE JAKOB FELLINGER MICHAEL LESKOWSCHEK P.E.COLLIN ALDIA ALINE S.MAYER LUKAS W.PERNER SARPER SALMAN MINGQI FAN PRANNAY BALLA STÉPHANE SCHILT CHRISTOPH M.HEYL INGMAR HARTL GIL PORAT OLIVER H.HECKL Christian Doppler Laboratory for Mid-IR Spectroscopy and Semiconductor Optics Faculty Center for Nano Structure ResearchFaculty of PhysicsUniversity of ViennaA-1090 ViennaAustria Photonics Institute TU WienA-1040 ViennaAustria Vienna Doctoral School in Physics University of ViennaA-1090 ViennaAustria Deutsches Elektronen-Synchrotron DESY 22607 HamburgGermany Laboratoire Temps-Fréquence Universitéde NeuchâtelCH-2000 NeuchâtelSwitzerland GSI Helmholtzzentrum für Schwerionenforschung GmbH 64291 DarmstadtGermany Helmholtz-Institute Jena 07743 JenaGermany Department of Electrical and Computer Engineering University of AlbertaEdmontonAlberta T6G 1H9Canada Department of Physics University of AlbertaEdmontonAlberta T6G 2E1Canada

Tailoring the properties of the driving laser to the need of applications often requires compromises among laser stability,high peak and average power levels,pulse duration,and spectral *** instance,spectroscopy with optical frequency combs in the extreme/visible ultraviolet spectral region requires a high peak power of the near-IR driving laser,and therefore high average power,pulse duration of a few tens of fs,and maximal available spectral ***,the parametric conversion efficiency is higher for pulses with a duration in the 100-fs range due to temporal walk-off and coating *** we suggest an approach to adjust the spectral characteristics of high-power chirped-pulse amplification(CPA)to the requirements of different nonlinear frequency converters while preserving the low-phase-noise(PN)properties of the *** achieve spectral tunability,we installed a mechanical spectral shaper in a free-space section of the stretcher of an in-house-developed ytterbium-fiber-based CPA *** CPA system delivers 100 W of average power at a repetition rate of 132.4 *** gaining control over the spectral properties,we preserve the relative-intensity-noise and PN properties of the *** high-power CPA can easily be adjusted to deliver either a spectrum ideal for mid-IR light generation(full width at half maximum of∼11 nm,compressed pulse duration of 230 fs)or a spectrum ideal for highly nonlinear processes such as high-harmonic generation(−10 dB level of>50 nm,transform-limited pulse duration of∼65 fs).

关键词： pulse power fiber

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Active stabilization of terahertz waveforms radiated from a two-color air plasma

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Photonics Research 2022年第1期10卷 96-103页

作者： YONGHAO MI KYLE JOHNSTON valentina shumakova SφREN H.MφLLER KAMALESH JANA CHUNMEI ZHANG ANDRé STAUDTE SHAWN SEDERBERG PAUL B.CORKUM Joint Attosecond Science Laboratory University of Ottawa and National Research Council CanadaOntario K1N 6X1Canada School of Engineering Science Simon Fraser UniversityBurnabyBritish Columbia V5A 1S6Canada

Intense laser fields focused into ambient air can be used to generate high-bandwidth current densities in the form of plasma channels and *** with bichromatic fields enables us to adjust the amplitude and sign of these currents using the relative phase between the two light ***-color filamentation in gas targets provides a route to scaling the energy of terahertz pulses to microjoule levels by driving the plasma channel with a high-energy laser ***,the structure of plasma channels is highly susceptible to drifts in both the relative phase and other laser parameters,making control over the waveform of the radiated terahertz fields *** establish a clear link between the phase dependence of plasma currents and terahertz radiation by comparing in situ detection of current densities and far-field detection of terahertz electric *** show that the current measurement can be used as a feedback parameter for stabilizing the terahertz *** approach provides a route to energetic terahertz pulses with exceptional waveform stability.

关键词： stabilization terahertz Active

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