Essays about: "attosecond"

Showing result 6 - 10 of 34 essays containing the word attosecond.

1. 6. Pulsed Laser Beam Quality Assessment via Phase Retrieval

   University essay from Lunds universitet/Atomfysik

   Author : Mattias Ammitzböll; [2021]
   Keywords : GSA; phase retrieval; Gerchberg-Saxton; femtosecond; pulsed; laser; beam quality; attosecond; interferometry; Physics and Astronomy;

   Abstract : In the search for a better understanding of the fundamental nature of the atom, the development of femtosecond pulsed laser sources has opened up for many applications, in particular in time-resolved physics. For many of those, like the generation of attosecond pulses through high-order harmonic generation, high intensity is needed and the quality of the beam is a critical factor. READ MORE

3. 7. Microscopic and Macroscopic Samples of Atoms in Superposition States Studied by Attosecond Pulses

   University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

   Author : Axel Stenquist; [2021]
   Keywords : Mathematical physics; Theoretical physics; Atomic physics; Attosecond physics; Ultra-fast physics; Numerical simulations; Microscopic; Mesoscopic; Macroscopic; Superposition; Light matter interaction; Quantum mechanics; Electromagnetism; Semiclassical; Attosecond transient absorption spectroscopy; ATAS; Förster resonance; FRET; Two-atom model; Inter-atomic interaction; Dipole-dipole interaction; Many-atom model; Collective coherent effects; Time-dependent configuration-interaction singles; TDCIS; Physics and Astronomy;

   Abstract : In the present thesis, the interaction between atoms in superposition states and attosecond pulses is studied from the microscopic to the macroscopic regime. Using a semi-classical framework, three different models have been explored in order to investigate attosecond light--matter interaction processes. READ MORE

4. 8. Relativistic attosecond electron pulses by laser wakefield acceleration

   University essay from Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

   Author : Cornelia Gustafsson; [2020]
   Keywords : laser wakefield accelerator; laser wakefield acceleration; attosecond; electron pulses; Physics and Astronomy;

   Abstract : The search for cheaper and more compact accelerators has led to the development of laser-driven plasma-based accelerators. In comparison to conventional particle accelerators, the plasma-based accelerator is inherently insensitive to the breakdown of the acceleration structure and therefore greater accelerating fields can be obtained. READ MORE

5. 9. Manipulation and application of laser light using spatial light modulation

   University essay from Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

   Author : Albin Hedse; [2020]
   Keywords : spatial light modulation; wavefront correction; high harmonic generation; harmonic divergence; Physics and Astronomy;

   Abstract : Attosecond pulses obtained via high harmonic generation often suffer from chromatic aberration. This is inherent from the generation process as a consequence of the spatial profile of the driving laser pulses. READ MORE

6. 10. Towards the control of photo-ionization with electron wave-packet interferences

   University essay from Lunds universitet/Synkrotronljusfysik; Lunds universitet/Fysiska institutionen

   Author : Andreas Stokkeland; [2020]
   Keywords : XUV attosecond pulses; photoelectron distribution; photoionization; phase shift; electron wave-packet interference; infrared field; IR-field; frequency components; Fourier transform; XUV photons; frequency domain; Physics and Astronomy;

   Abstract : In this work the photoelectric effect is explored through simulations of the phase shift that an IR-field can induce into an electron wave packet and the photoelectron distribution over frequency components that is produced in the photoionization of an atom with a attosecond pulses made of XUV photons. The IR-field is sent along two attosecond pulses made of XUV photons towards a 3D momentum spectrometer were there is a gas that can be photoionized and the photoelectrons can be measured. READ MORE