TY - JOUR
T1 - Spatially and spectrally resolved quantum path interference with chirped driving pulses
AU - Carlström, Stefanos
AU - Preclíková, Jana
AU - Lorek, Eleonora
AU - Larsen, Esben Witting
AU - Heyl, Christoph Michael
AU - Palecek, David
AU - Zigmantas, Donatas
AU - Schafer, Kenneth Joseph
AU - Gaarde, Mette B
AU - Mauritsson, Johan
PY - 2016/12/1
Y1 - 2016/12/1
N2 - We measure spectrally and spatially resolved high-order harmonics generated in argon using chirped multi-cycle laser pulses. Using a stable, high-repetition rate laser we observe detailed interference structures in the far-field. The structures are of two kinds; off-axis interference from the long trajectory only and on-axis interference including the short and long trajectories. The former is readily visible in the far-field spectrum, modulating both the spectral and spatial profile. To access the latter, we vary the chirp of the fundamental, imparting different phases on the different trajectories, thereby changing their relative phase. Using this method together with an analytical model, we are able to explain the on-axis behaviour and access the dipole phase parameters for the short (${\alpha }_{{\rm{s}}}$) and long (${\alpha }_{{\rm{l}}}$) trajectories. The extracted results compare very well with phase parameters calculated by solving the time-dependent Schrödinger equation. Going beyond the analytical model, we are also able to successfully reproduce the off-axis interference structure.
AB - We measure spectrally and spatially resolved high-order harmonics generated in argon using chirped multi-cycle laser pulses. Using a stable, high-repetition rate laser we observe detailed interference structures in the far-field. The structures are of two kinds; off-axis interference from the long trajectory only and on-axis interference including the short and long trajectories. The former is readily visible in the far-field spectrum, modulating both the spectral and spatial profile. To access the latter, we vary the chirp of the fundamental, imparting different phases on the different trajectories, thereby changing their relative phase. Using this method together with an analytical model, we are able to explain the on-axis behaviour and access the dipole phase parameters for the short (${\alpha }_{{\rm{s}}}$) and long (${\alpha }_{{\rm{l}}}$) trajectories. The extracted results compare very well with phase parameters calculated by solving the time-dependent Schrödinger equation. Going beyond the analytical model, we are also able to successfully reproduce the off-axis interference structure.
UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85007578539&origin=inward&txGid=0BAC42A745DCA396BF83175F74BEDB5F.wsnAw8kcdt7IPYLO0V48gA%3a49
U2 - 10.1088/1367-2630/aa511f
DO - 10.1088/1367-2630/aa511f
M3 - Article
SN - 1367-2630
VL - 18
JO - New Journal of Physics
JF - New Journal of Physics
IS - 12
M1 - 123032
ER -