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 bandwidth.For 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 bandwidth.Contrarily,the parametric conversion efficiency is higher for pulses with a duration in the 100-fs range due to temporal walk-off and coating limitations.Here we suggest an approach to adjust the spectral characteristics of high-power chirped-pulse amplification(CPA)to the requirements of different nonlinear fre-quency converters while preserving the low-phase-noise(PN)properties of the system.To achieve spectral tun-ability,we installed a mechanical spectral shaper in a free-space section of the stretcher of an in-house-developed ytterbium-fiber-based CPA system.The CPA system delivers 100 W of average power at a repetition rate of 132.4 MHz.While gaining control over the spectral properties,we preserve the relative-intensity-noise and PN properties of the system.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(—1OdB level of＞50 nm,transform-limited pulse duration of～65 fs).

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 Research,Faculty of Physics,University of Vienna,A-1090 Vienna,Austria;Photonics Institute,TU Wien,A-1040 Vienna,Austria;Vienna Doctoral School in Physics,University of Vienna,A-1090 Vienna,Austria;Deutsches Elektronen-Synchrotron DESY,22607 Hamburg,Germany;Laboratoire Temps-Fréquence,Université de Neuchatel,CH-2000 Neuchatel,Switzerland;GSI Helmholtzzentrum für Schwerionenforschung GmbH,64291 Darmstadt,Germany;Helmholtz-Institute Jena,07743 Jena,Germany;Department of Electrical and Computer Engineering,University of Alberta,Edmonton,Alberta T6G 1H9,Canada;Department of Physics,University of Alberta,Edmonton,Alberta T6G 2E1,Canada

光子学研究（英文）

[1]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-.Spectrally tunable high-power Yb∶fiber chirped-pulse amplifier)[J].光子学研究（英文）,2022(10):2309-2316

Spectrally,1OdB

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