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We present a completely new approach to attosecond measurement and control. In this scheme the re-collision process is probed or manipulated during its occurrence. In the talk I will describe novel approaches which rely on manipulation of the light matter interaction by controlling the temporal and spatial shape of the laser field. When the manipulation is applied in a perturbative manner, the main properties of the interaction are not modified. However, the perturbation acts as a probe and can be used to characterize the emitted attosecond pulses. Physically we induce a sub-cycle gate. I will describe alternative approaches for attosecond gating, based on phase amplitude or polarization manipulation. Increasing the perturbative field, we can extend the measurement scheme into a control scheme and thus control the pulses temporal or spatial profile. Finally, we combine our approach with orbital tomography by applying gating to probe the spatial structure of an atomic wave function. Temporal gating is a general concept, applicable to a broad range of dynamic measurements. By exploiting optical methods of temporal gating we open the door to fully time resolved experiments re-collision experiments. |
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