Bright,coherent soft X-ray radiation is essential to a variety of applications in fundamental research and life sciences.To date,a high photon flux in this spectral region can only be delivered by synchrotrons,free-el...Bright,coherent soft X-ray radiation is essential to a variety of applications in fundamental research and life sciences.To date,a high photon flux in this spectral region can only be delivered by synchrotrons,free-electron lasers or high-order harmonic generation sources,which are driven by kHz-class repetition rate lasers with very high peak powers.Here,we establish a novel route toward powerful and easy-to-use SXR sources by presenting a compact experimentin which nonlinear pulse self-compression to the few-cycle regime is combined with phase-matched high-orderharmonic generation in a single,helium-illed antiresonant hollow-core fibre.This enables the first 100 kHz-classrepetition rate,table-top soft X-ray source that delivers an application-relevant flux of 2.8×10^6 photon s^-1 eV^-1 around 300 ev.The fibre integration of temporal pulse self-compression(leading to the formation of the necessarystrong-field waveforms)and pressure-controlled phase matching will allow compact,high-repetition-rate lasertechnology,including commercially available systems,to drive simple and cost-effective,coherent high-flux softX-ray sources.展开更多
基金The authors would like to thank Prof.Adrian Pfeiffer and Dr.Felix Kittig forfruitful discussions and help with the numerical methods.Furthermore,theauthors would like to thank Dr.Steffen Hadrich,Dr.Cesar Jauregui-Misas,andTobias Ulsperger for their help in the early stages of this work.This work wassupported by the European Research Council(ERC)under the EuropeanUnion's Horizon 2020 research and innovation programme(grant 835306,SALT)the Fraunhofer Cluster of Excellence Advanced Photon Sources(CAPS)+1 种基金the Helmholtz-Institute Jena,the U.S.Army Research Office(grant W911NF1910426)the U.S.Air Force Office of Scientific Research(grantFA9550-15-10041).
文摘Bright,coherent soft X-ray radiation is essential to a variety of applications in fundamental research and life sciences.To date,a high photon flux in this spectral region can only be delivered by synchrotrons,free-electron lasers or high-order harmonic generation sources,which are driven by kHz-class repetition rate lasers with very high peak powers.Here,we establish a novel route toward powerful and easy-to-use SXR sources by presenting a compact experimentin which nonlinear pulse self-compression to the few-cycle regime is combined with phase-matched high-orderharmonic generation in a single,helium-illed antiresonant hollow-core fibre.This enables the first 100 kHz-classrepetition rate,table-top soft X-ray source that delivers an application-relevant flux of 2.8×10^6 photon s^-1 eV^-1 around 300 ev.The fibre integration of temporal pulse self-compression(leading to the formation of the necessarystrong-field waveforms)and pressure-controlled phase matching will allow compact,high-repetition-rate lasertechnology,including commercially available systems,to drive simple and cost-effective,coherent high-flux softX-ray sources.
