Sökning: "laser diodes"

Visar resultat 16 - 20 av 32 avhandlingar innehållade orden laser diodes.

  1. 16. Statistical Calibration Algorithms for Lidars

    Författare :Anas Alhashimi; Steffi Knorn; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Reglerteknik; Control Engineering;

    Sammanfattning : Robots are becoming increasingly available and capable, are becoming part of everyday life in applications: robots that guide blind or mentally handicapped people, robots that clean large office buildings and department stores, robots that assist people in shopping, recreational activities, etc.Localization, in the sense of understanding accurately one's position in the environment, is a basic building block for performing important tasks. LÄS MER

  3. 17. Structural studies of InGaAsP/InP-based lasers : By Thomas Kallstenius

    Författare :Thomas Kallstenius; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; Materialvetenskap; Materials science; Teknisk materialvetenskap; materialvetenskap; Materials Science;

    Sammanfattning : Reliable buried-heterostructure (BH) InGaAsP/InP-based laser diodes (LDs) is essentialto the operation of fiber optics communication systems. In this thesis, the structural,electrical and optical properties of such LDs have been studied. The aim has been toidentify materials-related mechanisms causing gradual emission degradation. LÄS MER

  4. 18. 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

  5. 19. Combined Digital Holography and Speckle Correlation for Rapid Shape Evaluation

    Författare :Davood Khodadad; Anna Runnemalm; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Experimental Mechanics; Experimentell mekanik; Maskinteknik;

    Sammanfattning : In manufacturing industry there is a high demand for on line quality control to minimize the risk of incorrectly produced objects. Conventional contact measurement methods are usually slow and invasive, meaning that they cannot be used for soft materials and for complex shapes without influencing thecontrolled parts. LÄS MER

  7. 20. Localization effects in ternary nitride semiconductors

    Författare :Vytautas Liuolia; Saulius Marcinkevicius; Toshiharu Saiki; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; AlGaN; InGaN; AlInN; LEDs; near-field microscopy; carrier dynamics; alloy fluctuations; carrier localization; built-in electric field; nonpolar planes; polarized luminescence;

    Sammanfattning : InGaN based blue and near-ultraviolet light emitting diodes and laser diodes have been successfully commercialized for many applications such as general lighting, display backlighting and high density optical storage devices. Despite having a comparably high defect density, these devices are known for their efficient operation, which is attributed to localization in potential fluctuations preventing carriers from reaching the centers of nonradiative recombination. LÄS MER