OPTIMIZATION AND SINGLE-SHOT CHARACTERIZATION OF ULTRASHORT THz PULSES FROM A LASER WAKEFIELD ACCELERATOR Page: 3 of 3
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Figre , Sacetim crss eeam aS aie inasnl-h40yTm0a lcti-il rsscreainTEMPORAL ELECTRIC-FIELD
CROSS-CORRELATION
Real-time optimization and characterization of the T-
rays generated by a laser wakefield accelerator requires
techniques capable of measuring the temporal eectric pro-
file of these THz pulses on a single-shot basis. The retrieval
of a space-tune cross-section using 2D sign-resolved EQ
sampling is time-consuming and susceptible to shot-tv-shot
fluctuations. Although several techniques exist to capture
TH waveforms in a single-shot [6, 13]. we have developed
a new one which overcames the temporal resolution limits-
lions of "spectral encod'm" [14), and avoids the difficulties
asaociated with a secondary nonlinear proceu (e.g. second-
hmonic generation), while combining the advantages of
both.
This new technique [15] is a variation of the single-shot
temporal cross-conelation technique [6). A chirped pulse
(few picoseconds long) overlaps the THz pulse in a EO
crystal and experiences both amplitude and phase modula-
tion, providing two simultaneousretrievals of the full tem-
porai electric-field distribution. Because the accumulaed
phase shift scales linearly with the electric-field, the phase
modulation provides a benchmark for the "beer-rotation"
occurring in the amplitude modulation. Preliminary results
(Fig- 2) corroborate all the observations described in the
previous section, iLe pulse duration, peak electic-field and
spatiotvrporal coupling at the T-rays focus.
CONCLUSION
We have demonstrated generation of 0.4 ps mu Tlz
pulses with > 54yJ of energy, - 0.3 MV/cm peak electric-
fields, We showed that these few-cycle T-rays experience
a strong spatiotemporal coupling which impacts its proper-
ties and, therefore, the interpretation of the LWlFA charac-teristics. Finally, we have also demonstrated the ability to
characterize in a single-shot both amplitude and phase of
the THz pulses, providing shot-to-shut information on the
clcctwn bunch duration.
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Plateau, G. R.; Matlis, N. H.; van Tilborg, J.; Geddes, C. G. R.; Toth, Cs.; Schroeder, C. B. et al. OPTIMIZATION AND SINGLE-SHOT CHARACTERIZATION OF ULTRASHORT THz PULSES FROM A LASER WAKEFIELD ACCELERATOR, article, May 4, 2009; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc933395/m1/3/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.