Sökning: "Gaussian beams"

Visar resultat 6 - 10 av 16 avhandlingar innehållade orden Gaussian beams.

  1. 6. Terrain navigation for underwater vehicles

    Författare :Ingemar Nygren; Magnus Jansson; Stephen Rock; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signal processing; Signalbehandling;

    Sammanfattning : In this thesis a terrain positioning method for underwater vehicles called the correlation method is presented. Using the method the vehicle can determine its absolute position with the help of a sonar and a map of the bottom topography. LÄS MER

  3. 7. DEVELOPMENT OF A HIGH ENERGY TI:SAPPHIRE LASER FOR THE EXCITATION OF EXTREME ULTRAVIOLET LASERS

    Författare :Dale Martz; Jorge Rocca; Colorado State University; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; SRA - E-vetenskap SeRC ; SRA - E-Science SeRC ;

    Sammanfattning : This dissertation describes the design, construction and characterization of a high energy chirped-pulse amplification Titanium-Sapphire laser system for the excitation of Extreme Ultraviolet (EUV) lasers. Compact EUV lasers have made possible nano-scale imaging, dense plasma diagnostics and photo-chemistry and photo-physics studies. LÄS MER

  4. 8. Diffractive Optics Design

    Författare :Jörgen Bengtsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; computer-generated waveguide hologram; diffractive optics; fan-out; millimeter wave radiation; proximity effect; optimal-rotation-angle method; kinoform; integrated optics; beam shaping; outcoupling grating; scalar optics;

    Sammanfattning : Diffractive optical elements (kinoforms) change the way light propagates, and can perform very complex tasks. They can split an incident beam into any number of outgoing, and possibly focused, beams (fan-out). LÄS MER

  5. 9. Development of an analytic Beam Model with non-linear Space-Charge Forces and Envelope Stability Studies

    Författare :Michael Holz; Volker Ziemann; Roger Ruber; Mohammad Eshraqi; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Space-charge—the repelling force of same-charged particles—is a major challenge in the development and application of high-current linear accelerators like spallation sources or accumulator rings. Understanding the dynamical behavior of the beam in its presence is imperative to prevent beam loss and subsequent detrimental effects. LÄS MER

  7. 10. Axicon imaging by scalar diffraction theory

    Författare :Anna Burvall; KTH; []
    Nyckelord :axicons; diffractive optics; coherence; asymptotic methods; communication modes; information content; inverse problems;

    Sammanfattning : Axicons are optical elements that produce Bessel beams,i.e., long and narrow focal lines along the optical axis. Thenarrow focus makes them useful ine. LÄS MER