TY  - JOUR
AU  - Kubullek, Maximilian
AU  - Silva Toledo, Miguel Angel
AU  - Mainz, Roland E.
AU  - Scheiba, Fabian
AU  - de Q. Garcia, Rafael
AU  - Ritzkowsky, Felix
AU  - Rossi, Giulio Maria
AU  - Kärtner, Franz X.
TI  - Complete electric field characterization of ultrashort multi-colour pulses
JO  - Ultrafast science
VL  - 5
SN  - 2097-0331
CY  - Washington, DC
PB  - American Association for the Advancement of Science, AAAS
M1  - PUBDB-2025-00454
SP  - 0081
PY  - 2025
AB  - 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 carrier-envelope 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 all-optical, 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001418823900001
DO  - DOI:10.34133/ultrafastscience.0081
UR  - https://bib-pubdb1.desy.de/record/622659
ER  -