|
Single shot Phazzler system operating around 800nm
Although
numerous self referenced techniques have been proposed and demonstrated
to measure or characterize the time dependent phase and amplitude of
ultrashort pulses, all techniques suffer from specific weaknesses:
 Spectral
Phase Interferometry for Direct Electric field Reconstruction (SPIDER)
requires a precise calibration and determination of the relative delay
between two pulse replicas.
SH-FROG suffers from time ambiguity, and the phase retrieval process is not straightforward.
Autocorrelation,
while useful tool to characterize the pulse intensities and duration,
do not provide for spectral phase information.
Cross checking between autocorrelation, SPIDER and SH-FROG is often difficult as it
involves separate measurement devices, which multiplies the causes of
experimental errors, such as calibration of the detectors and
dispersion of the optical elements.
The
Phazzler, thanks to the quantitative capabilities of the Dazzler,
brings to the user the capability of comparing the measurement results
using different methods with the same instrument, and without any
re-alignment. The Phazzler thus drastically enhances the
reproducibility, the reliability as well as consistency of the results,
making it a unique reference tool for ultrafast researchers.
|
Single shot SPIDER, multiple shot FROGs 