The advancement of laser technology,producing increasingly shorter and more intricate optical pulses,has elevated the significance of precise characterization of a transient electric field,including the carrierenvelop...The advancement of laser technology,producing increasingly shorter and more intricate optical pulses,has elevated the significance of precise characterization of a transient electric field,including the carrierenvelope phase.This characterization must cover progressively larger spectral bands and be performed as close as possible to the experimental site to enable a detailed understanding of the coherent light–matter interaction.Furthermore,in many experiments,two(or more)different ultrashort pulses are used,calling for a technique capable of characterizing multiple electric fields simultaneously.Here,we introduce the TREX(third-order reconstruction of electric fields via cross(X)-correlation)method,which allows the alloptical,in situ characterization of the complete electric fields of 2 broadband pulses with different central wavelengths.The method relies on the measurement of the perturbative third-order nonlinear response generated in a noble gas target while varying the delay between 2 pulses.The resulting spectrograms can be reconstructed using a custom evolutionary algorithm.The technique is demonstrated by retrieving the complete electric field,including the carrier-envelope phase,generated by the coherent synthesis of 2 ultrashort pulses.These synthesized waveforms reach time durations below a single optical cycle,demonstrating the ability of TREX to characterize complex multioctave-spanning electric fields.展开更多
基金supported by the Helmholtz Asso ciation Program MML-Matter,by the Cluster of Excellence“CUI:Advanced Imaging of Matter”of the Deutsche Forschungsgemeinschaft(DFG)(EXC 2056-project ID 390715994)by PIER,the partnership of Universit鋞Hamburg and DESY(grant ID PIF-2022-07).
文摘The advancement of laser technology,producing increasingly shorter and more intricate optical pulses,has elevated the significance of precise characterization of a transient electric field,including the carrierenvelope phase.This characterization must cover progressively larger spectral bands and be performed as close as possible to the experimental site to enable a detailed understanding of the coherent light–matter interaction.Furthermore,in many experiments,two(or more)different ultrashort pulses are used,calling for a technique capable of characterizing multiple electric fields simultaneously.Here,we introduce the TREX(third-order reconstruction of electric fields via cross(X)-correlation)method,which allows the alloptical,in situ characterization of the complete electric fields of 2 broadband pulses with different central wavelengths.The method relies on the measurement of the perturbative third-order nonlinear response generated in a noble gas target while varying the delay between 2 pulses.The resulting spectrograms can be reconstructed using a custom evolutionary algorithm.The technique is demonstrated by retrieving the complete electric field,including the carrier-envelope phase,generated by the coherent synthesis of 2 ultrashort pulses.These synthesized waveforms reach time durations below a single optical cycle,demonstrating the ability of TREX to characterize complex multioctave-spanning electric fields.
