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(Color online) Comparison between the output spectra from (a) the conventional method with a constant pressure and (b) the pressure gradient method. The vertical axis shows the spatial distribution of the output beam.
Spectral profiles of (a) input and (b) output pulses. The corresponding energies were 8.5 and 6.5 mJ, respectively.
Autocorrelation traces for (a) input and (b) output pulses after dispersion compensation. is the FWHM of the autocorrelation traces. The dashed line shows the predicted autocorrelation trace from the spectrum shown in Fig. 3(b).
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