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National Repository of Grey Literature 12 records found  previous11 - 12  jump to record: Search took 0.01 seconds. 
Welding of aluminum alloys using high-power semiconductor laser
 Mikeš, David ; Kubíček, Jaroslav (referee) ; Mrňa, Libor (advisor)
Thesis deals with the optimization of process parameters during laser welding of aluminum alloys 5000 series. The theoretical part describes the types of lasers and their applications in industry, further discusses the properties of aluminum alloys, laser welding theory and principles of monitoring and diagnostics of laser process. In the experimental part the samples were welded using a semiconductor laser. For those samples were evaluated mechanical properties, welded defects and structure depending on the process parameters. Using the photodetector was observed stability of laser process by sensing the plasma plume. The link between stability and the formation of structural defects in the weld joint was observed from the measurement results.
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Semiconductor laser driver for 1Gbit/s
 Chlachula, Filip ; Křivák, Petr (referee) ; Prokeš, Aleš (advisor)
This master´s thesis deals with a solution of the driving circuits of semiconductor laser. In the beginning of the thesis there is an analysis of semiconductor lasers and its characteristics. Then the principle of laser diodes and its excitation is described. This thesis is focused on semiconductor laser excitation through the use of direct and modulating current. Several circuits are described, designed and simulated. The best resulting circuit is realized and measured in the laboratory.
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National Repository of Grey Literature : 12 records found   previous11 - 12  jump to record:
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