Search for dissertations about: "surface relief"

Showing result 1 - 5 of 33 swedish dissertations containing the words surface relief.

  1. 1. Mode and Polarization Control in VCSELs using Surface Structures

    Author : Åsa Haglund; [2005]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; single mode; dynamics; surface relief; Semiconductor laser; polarization; vertical-cavity surface-emitting laser; sub-wavelength grating; fabrication;

    Abstract : The vertical-cavity surface-emitting laser (VCSEL) is a novel, low-cost light source with many attractive performance characteristics, such as low operating current, circular output beam, and high modulation bandwidth at low currents. This together with its easy integration into two-dimensional arrays has made it an established transmitter in short-distance single and parallel fiber-optical links, and new applications are continuously arising. READ MORE

  2. 2. Vertical Cavity Surface Emitting Lasers for Access Network Applications

    Author : Emma Söderberg; [2007]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; highly strained InGaAs; single mode emission; Vertical Cavity Surface Emitting Lasers VCSELs ; inverted surface relief; high speed modulation;

    Abstract : .... READ MORE

  3. 3. Manufacture of High Efficiency Surface Relief Computer Generated Holograms

    Author : Mats Ekberg; [1992]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; kinoforms;

    Abstract : This thesis treats design, manufacture, evaluation and applications of computer-generated surface relief holograms - kinoforms. These diffractive, phase-only, planar optical components are characterized by high efficiency, design flexibility, light weight and small size. They can further be reproduced at low cost. READ MORE

  4. 4. Modal Dynamics of Vertical-Cavity Surface-Emitting Lasers

    Author : Johan Gustavsson; [2003]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; transverse modes; noise; modeling; Semiconductor laser; dynamics; vertical-cavity surface-emitting laser;

    Abstract : In this work, a comprehensive dynamic model has been developed for simulating a novel semiconductor laser type, referred to as the Vertical-Cavity Surface-Emitting Laser (VCSEL). The high-speed behavior was simulated and compared to experiments, where excellent agreement was found. READ MORE

  5. 5. Process chain simulation of forming, welding and heat treatment of Alloy 718

    University dissertation from Trollhättan : University West

    Author : Joachim Steffenburg-Nordenström; Lars-Erik Svensson; Lars-Erik Lindgren; Fredrik Niklasson; [2017]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Forming; Welding; Stress relieve annealing; Heat treatment; Finite Element Simulation; Manufacturing process chain; Alloy 718; Production Technology; Produktionsteknik; Manufacturing and materials engineering; Produktions- och materialteknik;

    Abstract : Manufacturing of aero engine components requires attention to residual stress and final shape of the product in order to meet high quality product standards.This sets very high demands on involved manufacturing steps to meet design requirements. READ MORE