University of Twente Student Theses


Coherent control of high-harmonic generation

Barreaux, J. (2012) Coherent control of high-harmonic generation.

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Abstract:This work allowed first to confirm and validate the previous experiments by producing successfully high-harmonic radiations with xenon. The spectrum of the generated harmonic radiation was successfully measured and, so far, we were able to generate radiation with a cut-off wavelength of 42 nm (30 eV), corresponding to the 19th harmonic of the 800 nm wavelength of the drive laser. The tuning of the phase-matching conditions by the gas pressure has also been demonstrated again experimentally. It is planned to use a different capillary with a larger diameter, in order to increase the interaction volume and maybe to improve the high-harmonic output. A first numerical model of the DazzlerTM was made and used to get a first global idea of which kind of shaping is possible with this device. The model could yet be improved, for instance by adding the possibily to use as input any kind of pulses, calculated or recorded by an other device. We also presented the first experiments of high-harmonic generation done with pulse shaping of the drive laser field by using of the DazzlerTM. The results obtained from these experiments are really encouraging since they show an in uence of the pulse shaping by the Dazzler on the high-harmonic output. More specifically, one of the desired effect, the tuning, was demonstrated using the second order phase setting, although the yield was reduced. Still the results are promising. So far only one parameter has been varied at the time and to tune and selectively enhance a particular harmonic requires optimization in a multi-dimensional parameter space. Such kind of optimization is ideally the playground of evolutionary algorithms. Such a control algorithm will be implemented in the near future and these initial measurement, together with other planned measurements, will help us to understand the individual effect of each of the parameters used in the optimization process.
Item Type:Essay (Master)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics MSc (60436)
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