Sökning: "wave packets"

Visar resultat 11 - 15 av 23 avhandlingar innehållade orden wave packets.

  1. 11. X-ray Spectroscopy of Molecules Driven by Strong IR Fields

    Författare :Freddy Fernandes Guimaraes; Faris Gelmukhanov; Michael Meyer; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Theoretical chemistry; Teoretisk kemi;

    Sammanfattning : The current thesis deals with one important branch of the physics of ultrafast processes, namely modeling of femtosecond nuclear dynamics. We suggest a new type of time resolved spectroscopy, the phase sensitive infrared-x-ray pump probe spectroscopy, which combines rich opportunities of IR laser techniques in quantum control of molecular systems with the site selectivity of x-rays. LÄS MER

  3. 12. Theory for superconducting few-photon detectors

    Författare :Mattias Jönsson; Jack Lidmar; Mats Wallin; Marcin Swillo; Karl Berggren; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Fysik; Physics;

    Sammanfattning : High-performance photon detectors are essential for fiber communication, which is the foundation of the modern internet. Emerging quantum information technologies, such as quantum key distribution, impose new requirements on the photon detectors used. LÄS MER

  4. 13. Discrete aperiodically ordered structures in low dimensions

    Författare :Bruno Lindquist; Jens Juul Rasmussen; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : This thesis deals with discrete models for one-dimensional (1D) and two-dimensional (2D) aperiodic systems such as quasicrystals and aperiodic superlattices. Various model systems are investigated using different forms of the tight-binding (TB) approximation. LÄS MER

  5. 14. Pulse Propagation in Nonlinear Media and Photonic Crystals

    Författare :Victor Kimberg; Faris Gelmukhanov; Shaul Mukamel; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Photonic Crystals; Nonlinear optics; X-ray spectroscopy; Theoretical chemistry; Teoretisk kemi;

    Sammanfattning : The present thesis is devoted to theoretical studies of pulse propagation of light through linear and nonlinear media, and of light-induced nuclear dynamics. The first part of the thesis addresses propagation of light pulses in linear periodical media - photonic crystals. LÄS MER

  7. 15. Fast Radon Transforms and Reconstruction Techniques in Seismology

    Författare :Viktor Nikitin; Matematik LTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Fourier transform FFT ; Radon transforms; GPU;

    Sammanfattning : The measurements conducted in tomography and seismology typically yield large multidimensional data sets. This in combination with the fact that the data may have an irregular structure makes it computationally prohibitive to use simple reconstruction methods directly. LÄS MER