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| Book/Dissertation / PhD Thesis | PUBDB-2022-00642 |
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2022
Verlag Deutsches Elektronen-Synchrotron DESY
Hamburg
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Please use a persistent id in citations: doi:10.3204/PUBDB-2022-00642
Report No.: DESY-THESIS-2022-001
Abstract: Since the advent of the first camera, flashes of light have been an integral tool in observing the world around us. Following the creation of the laser, these flashes of light have been getting temporally shorter and shorter, allowing faster and faster phenomena to be observed. Now these pulses can be as short as femtoseconds, or even a few attoseconds. Control over these short pulses also can allow observation and enable control over dynamics in matter. In the present thesis the complete characterisation of an all-reflective 4f pulse shaper is presented. A periodic spectral amplitude modulation is applied to a femtosecond Deep-UltraViolet (DUV) pulse within an open-loop shaping control scheme. The DUV pulse is produced via nonlinear frequency up-conversion from a fundamental infrared pulse. The pulses before and after this device are fully characterised in time, frequency and chirp. Transmission of the device in the DUV is also measured and data is given. Due to the all-reflective nature of the device it is capable of operating with coherent pulses at short wavelengths, such as pulses produced from a seeded free-electron laser via High-Gain Harmonic Generation (HGHG). The coherent pulses produced this way via seeding use the same DUV laser as is used to operate the pulse shaper and are generated as harmonics of the seed. The diffraction gratings in the shaper are designed such that harmonics of the seed laser follow the beampath of the DUV pulse through the pulse shaper, minimising the need for realignment. The coherent extreme-ultraviolet pulses produced from the seeded free-electron laser operating in HGHG are characterised in time and frequency by terahertz streaking. Chirp is applied to the ultraviolet seed pulse and the effect upon the output seeded free-electron laser pulse is explored with temporal pulse characterisation methods. Control over pulse shaping in the DUV and towards soft x-rays is interesting for applications such as coherent control, where dynamical processes in matter are controlled by coherent light fields.
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