Search for dissertations about: "high-order"

Showing result 6 - 10 of 192 swedish dissertations containing the word high-order.

  2. 6. Optimisation and Application of Intense High-Order Harmonic Pulses

    Author : Lena Roos; Atomfysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Coherent radiation; Optimisation; Multiphoton ionisation; Phase matching; Physics; Fysik; Atomic and molecular physics; Atom- och molekylärfysik; Laserteknik; Laser technology; High-power lasers; Short pulses; High-order harmonic generation; Short wavelength; Fysicumarkivet A:2001:Roos;

    Abstract : The high-order harmonics that are created in the interaction between an intense laser pulse (around 1014 W/cm2) and a gas medium are studied. The high-order harmonic radiation is a relatively new source of coherent radiation in the short wavelength range. READ MORE

  4. 7. Optimization of High-order Harmonic Generation for Attosecond Science

    Author : Robin Weissenbilder; Atomfysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; High-order Harmonic Generation; Attosecond Pulse Train; attosecond dynamics; photoelectron interferometry; Quantum state tomography; Phase matching; Fysicumarkivet A:2023:Weissenbilder;

    Abstract : High-order harmonic generation is a highly nonlinear, though inherently inefficient, process which can lead to emission of coherent, broadband extreme ultraviolet radiation in the form of attosecond pulses. Attosecond pulses are crucial for experiments investigating photoionization dynamics on the femto- and attosecond timescales. READ MORE

  5. 8. High Order Finite Difference Methods in Space and Time

    Author : Wendy Kress; Bertil Gustafsson; Gerald Warnecke; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; finite difference methods; Navier-Stokes equations; high order time discretization; deferred correction; stability; Numerical Analysis; Numerisk analys;

    Abstract : In this thesis, high order accurate discretization schemes for partial differential equations are investigated. In the first paper, the linearized two-dimensional Navier-Stokes equations are considered. READ MORE

  6. 9. Stable and High-Order Finite Difference Methods for Multiphysics Flow Problems

    Author : Jens Berg; Jan Nordström; Per Lötstedt; David Zingg; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Summation-by-parts; Simultaneous Approximation Term; Stability; High-order accuracy; Finite difference methods; Dual consistency; Beräkningsvetenskap med inriktning mot numerisk analys; Scientific Computing with specialization in Numerical Analysis;

    Abstract : Partial differential equations (PDEs) are used to model various phenomena in nature and society, ranging from the motion of fluids and electromagnetic waves to the stock market and traffic jams. There are many methods for numerically approximating solutions to PDEs. READ MORE

  7. 10. Second-generation High-Order Harmonic Sources — From CPA to OPCPA

    Author : Piotr Rudawski; Atomfysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Optical parametric chirped pulse amplification; Fysicumarkivet A:2014:Rudawski; Chirped pulse amplification; High-order harmonic generation; Attosecond pulse;

    Abstract : This thesis presents two sources of extreme ultraviolet (XUV) radiation based on high-order harmonic generation (HHG) in gases. The sources were developed for experiments requiring high-flux harmonic beams or HHG pulses at high-repetition rate. These were used experimentally to image nano-scale objects. READ MORE