Sökning: "fibre laser"

Visar resultat 21 - 25 av 58 avhandlingar innehållade orden fibre laser.

  1. 21. Processing technologies for long-wavelength vertical-cavity lasers

    Författare :Fredrik Salomonsson; KTH; []
    Nyckelord :VCSEL; vertical-cavity laser; semiconductor laser; long-wavelength; DBR; oxidation; wafer fusion; InGaAs; semiconductor processing;

    Sammanfattning : Vertical-cavity surface-emitting lasers (VCSELs) areattractive as potential inexpensive high-performance emittersfor fibre-optical communication systems. Their surface-normalemission together with the small dimensions are beneficial forlow-cost fabrication since it allows on-wafer testing,simplified packaging and effective fibre-coupling. LÄS MER

  3. 22. All-fibre optical sensor system for chemical sensing based on fibre Bragg grating technology

    Författare :Adel Asseh; KTH; []
    Nyckelord :;

    Sammanfattning : This thesis deals with the realization of an all-fibresensor system for chemical sensing through the evanescentfield, based on fibre Bragg grating technology. The advantagesof all-fibre systems are most apparent for the potential userof the system. These systems are of small size, have highmobility, and require no precision alignment. LÄS MER

  4. 23. Fibre suspension flocculation under simulated forming conditions

    Författare :Huawei Yan; KTH; []
    Nyckelord :;

    Sammanfattning : A flow loop system for study of fibre flocculation insuspensions has been developed. The system is designed tosimulate the flow conditions in a paper machine headbox. It isequipped with a radial distributor feeding a step diffuser pipepackage, after which the flow is contracted in a 2-D nozzle. LÄS MER

  5. 24. Optical monitoring and analysis of laser welding

    Författare :Ingemar Eriksson; Rémy Fabbro; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Manufacturing Systems Engineering; Produktionsutveckling;

    Sammanfattning : After the laser was invented in 1960, it was not long until someone started using this powerful source of light to weld parts together. Laser welding became an industrial application during the 1970's and the field has developed ever since. LÄS MER

  7. 25. The Morphology of Laser Arc Hybrid Welds

    Författare :Jan Frostevarg; Veli Kujanpää; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Manufacturing Systems Engineering; Produktionsutveckling;

    Sammanfattning : This thesis is about formation of surface imperfections formed in welding when using the manufacturing methods of laser welding and laser arc hybrid welding. In hybrid welding a traditional arc welding source and a laser share the same melt pool, making the process even more complex. LÄS MER