Spatially resolved small-angle noncollinear interferometric autocorrelation of ultrashort pulses with microaxicon arrays.
Small-angle, noncollinear, first- and second-order interferometric autocorrelation experiments with Ti:sapphire laser pulses of 9-80-fs duration have been performed with microaxicon arrays. Predictions of short-pulse spatial frequency effects were verified by comparison of interference patterns of single elements and matrices. An angular spectrum of Gaussian-shaped axicons was analyzed on the basis of linear refraction. Experimental data indicate contributions to autocorrelation by nonlinear refraction and travel-time differences. The influence of the spectral bandwidth was separated from the pulse-duration-dependent effects. Spatially resolved information about the coherence time was delivered by the multichannel structure.
Grunwald
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R
Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Berlin, Germany. grunwald@mbi-berlin.de
Griebner
U
U
Nibbering
E T
ET
Kummrow
A
A
Rini
M
M
Elsaesser
T
T
Kebbel
V
V
Hartmann
H J
HJ
Jüptner
W
W