Sökning: "beam focusing"

Visar resultat 1 - 5 av 47 avhandlingar innehållade orden beam focusing.

  1. 1. Grating-Coupled Surface-Emitting Lasers -- Circular and Unstable-Resonator Geometries

    Författare :Sigurgeir Kristjánsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; laser beam focusing; grating coupled surface emitters; simulation; unstable resonator lasers; surface-emitting lasers; integrated optics; gratings; circular gratings; BPM simulations; laser resonators; semiconductor lasers; optical planar waveguide couplers; electron beam lithography;

    Sammanfattning : This thesis deals with research in the field of grating-coupled surface-emitting lasers. The emphasis has been to study the modal behavior of lasers with two different resonator geometries: circular resonators and tapered unstable-resonators. LÄS MER

  3. 2. Applications of Laser-Plasma Acceleration

    Författare :Kristoffer Svendsen; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; laser wakefield acceleration; betatron radiation; X-rays; X-ray imaging; phase-contrast imaging; VHEE; radiotherapy; radiography; fuel injector; tomography; beam focusing; atomizing sprays; nanowires; liquid mass; target normal sheath acceleration; applications; charged particles;

    Sammanfattning : This thesis is dedicated to the investigation of laser-plasma particle acceleration concepts. Some of the work was focused on improving electron and proton acceleration for future applications, in terms of maximizing the particle energy and minimizing the divergence of the X-ray beams. LÄS MER

  4. 3. Electron beam profile measurements and emittance manipulation at the MAX-laboratory

    Författare :Åke Andersson; Lunds universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; optics; quantum excitation; emittance; synchrotron radiation; electron beam; lattice; Accelerator; storage ring; diffraction; Physics; Fysik;

    Sammanfattning : The emittances of the electron beams at the MAX-laboratory accelerator system have been studied. Apart from the build-up of the diagnostic tools for precise determination of the beam spatial profiles, the objectives have been: a) to verify the accelerator design emittances at low currents and to try to determine the emittances also at high currents; b) to investigate possibilities to manipulate the emittances. LÄS MER

  5. 4. Development of capillary optics for X-ray focusing

    Författare :Per Engström; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; x-ray micro beams; trace element analysis; energy dispersive x-ray flourescence; focused x-ray beam; density analysis; tapered x-ray waveguides; x-ray submicron beams; x-ray guide; x-ray optics; x-ray spectroscopy; capillary optics;

    Sammanfattning : .... LÄS MER

  7. 5. Development of New Experimental Facilities at the Lund Nuclear Microprobe Laboratory

    Författare :Asad Shariff; Kärnfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; low energy tailing; sub-micron beam; PRAM; grid shadow; Kärnfysik; Nuclear physics; GUPIX; Ion Beam Analysis; PIXE; Fysicumarkivet A:2004:Shariff;

    Sammanfattning : Ion beam analysis techniques are now well established as research tools for a broad range of multidisciplinary scientific fields. The ability to focus an ion beam down to micrometer size has expanded and strengthened the capability of IBA techniques to a higher level. LÄS MER