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We use an acousto-optic modulator at the input to a two-dimensional, Fourier-domain pulse shaper to achieve built-in characterization of the output pulses with spectral interferometry. The device is capable of rapid switching between pulse shapes.
We investigate dissociative ionization of aligned N2 molecules using intense ultrafast laser pulses. We find surprising differences in the yields of N2++, N+(1, 0) and N+(1, 1) as a function of molecular axis-laser polarization angle.
We measure the dependence of molecular fragmentation on a simple pulse shape parameterization at different intensities. The results indicate that dynamic Stark shifts of intermediate resonances play an important role in closed loop learning control.
We investigate control over molecular fragmentation in the halogen substituted acetone 1,1-dibromo-3,3,3-trifluoroacetone using shaped ultrafast laser pulses. Following insight gained from closed-loop learning control experiments, further tests reveal that control over the CF 3+ /CHBr 2+ ratio exploits a charge-transfer mechanism. We interpret the control in terms of adiabatic...
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