University of Twente Student Theses


Coherent control of high-harmonic generation

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

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Abstract:High-harmonic generation (HHG) is an extreme nonlinear optical process that allows the conversion of infrared laser light into coherent radiation with shorter wavelengths, in the extreme ultraviolet or soft X-ray regime (1-100 nm). Sources based on high-harmonic generation hold unique promises for application in diffractive imaging of single molecules and the seeding of free electron lasers (FEL), exploiting specifically the coherent nature and the short wavelength of the harmonic radiation. The tuning and the enhancement of the high-harmonic generation will be of great use. Indeed high-harmonic generation only produces odd harmonics of the fundamental frequency. For instance, for the seeding of a free electron lasers, it could necessary to tune these harmonics in order to fit one of them with the spectral gain area of the free electron lasers. The enhancement could then be used to increase the power of the harmonic fitting with the spectral gain area, to the detriment of the other harmonics. These are made by inducing modifications on the spectrum of the drive electric field used to produce high-harmonic generation. This report describes trials of tuning and enhancement of high-harmonic generation produced in a gas-filled hollow waveguide, using a device called Dazzler, brand name of the acousto-optic programmable dispersive filter (AO-PDF) developed by Pierre Tournois.
Item Type:Essay (Master)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics MSc (60436)
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