Sökning: "laser diodes"

Visar resultat 21 - 25 av 32 avhandlingar innehållade orden laser diodes.

  1. 21. Multiplexed Digital Holography incorporating Speckle Correlation

    Författare :Davood Khodadad; Pascal Picart; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Experimental Mechanics; Experimentell mekanik; Technology byts ev till Engineering ;

    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 the controlled parts. LÄS MER

  3. 22. Road surface classification using near infrared spectroscopy

    Författare :Johan Casselgren; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Experimentell mekanik; Experimental Mechanics;

    Sammanfattning : Statistics shows that most traffic accidents with fatal outcome can be related to slippery road conditions. The most hazardous road conditions are the ones that are hard for the driver to detect and that appears sudden on the road. LÄS MER

  4. 23. Molecular Beam Epitaxy and Characterisation of GaN-compounds on GaAs(001) and Sapphire(0001)

    Författare :Otto Zsebök; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; AlGaN GaN HFET; plasma-assisted MBE; GaNAs; nitridation damage; InGaN; group-III nitrides; GaN; AlGaN; phase-separation;

    Sammanfattning : The hexagonal (wurtzite) and the cubic (zinc blende) group-III nitrides and their heterostructures have attracted much attention due to their potential for applications in high-power, high-frequency electronic and optoelectronic devices. The optical emission range of the GaN-based alloys cover the whole visible range from near infrared (IR) to ultraviolet (UV). LÄS MER

  5. 24. Luminescent Polymer Films in Layered Devices : A Theoretical and Experimental Study on Light Emission from Polymer-based Devices

    Författare :Thomas Granlund; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis concerns optical modelling and characterisation of thin film layered structures, including luminescent conjugated polymers, with respect to the emission properties. Included in the study were three different types of devices: Organic light-emitting diodes, microcavities and half cavities. LÄS MER

  7. 25. Si-based structures for light emission and detection

    Författare :Amir Karim; Göran Hansson; Wei-Xin Ni; Tom Gregorkiewicz; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik;

    Sammanfattning : Efforts to improve the optical performance of the indirect bandgap semiconductor silicon (Si) has been a major subject of research in the field of Si photonics due to the promising applications of Si based light emitters and detectors for optical communication. With that motivation three different Si based material systems were investigated; Si:Er/O layered structures, SiGe quantum dots and SiSn nano structures, all grown using the technique of molecular beam epitaxy (MBE). LÄS MER