Sökning: "tuning range"

Visar resultat 1 - 5 av 124 avhandlingar innehållade orden tuning range.

  1. 1. Design and Performance of Optically Pumped Semiconductor Disk Lasers with Wide Tuning Ranges

    Författare :Carl Borgentun; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; optically pumped semiconductor disk laser; tuning range; high power; Semiconductor laser; vertical-external-cavity surface-emitting laser; design; beam characterization;

    Sammanfattning : In this work I present a strategy for providing the possibility to select the wavelength, or color, of a semiconductor laser over a very large range, by cleverly designing the vital part of the laser: the gain element of a so called optically pumped semiconductor disk laser. Optically pumped semiconductor disk lasers (OP-SDLs) are a relatively new class of lasers showing great promise for future applications. LÄS MER

  3. 2. Optically pumped semiconductor disk lasers for high-power wide wavelength tuning

    Författare :Carl Borgentun; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; beam characterization; design; high power; wavelength tuning; Semiconductor laser; gain measurements; vertical-external-cavity surface-emitting laser; optically pumped semiconductor disk laser;

    Sammanfattning : In this work I present and verify a strategy that makes it possible to change the wavelength, or color, of an external cavity semiconductor laser over a very large range. This is achieved by a careful design and thorough optimization of the active component — the gain element of the laser. LÄS MER

  4. 3. Compact solid-state lasers in the near-infrard and visible spectral range

    Författare :Kai Seger; Fredrik Laurell; Uwe Griebner; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; volume Bragg gratings; single-longitudinal-mode laser; laser tuning; Q-switching; mode-locking; carbon nanotubes; semiconductor lasers; neodymium; ytterbium; nonlinear optics; KTP;

    Sammanfattning : The subject of this thesis is the exploration of new concepts for compact solid-state lasers in the visible and near-infrared spectral range using new components such as volume Bragg gratings for wavelength stabilisation and wavelength tuning. Also single-walled carbon nanotubes for mode-locking and Q-switching of lasers have been studied. LÄS MER

  5. 4. On Automation of the PID Tuning Procedure

    Författare :Kristian Soltesz; Institutionen för reglerteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Within process industry, and in many other areas, the PID controller is responsible for handling regulatory control. An educated guess is that the number of executing PID control loops lies in the billions (2011) and there are no signs indicating a decrease of this number. Properly tuning the PID controller, i.e. LÄS MER

  7. 5. Cyclotides : Tuning Parameters Toward Their Use in Drug Design

    Författare :Mariamawit Yonathan Yeshak; Ulf Göransson; Lars Bohlin; Kaleab Asres; Robert Kiss; Uppsala universitet; []
    Nyckelord :cyclotide; Viola abyssinica; Viola odorata; Extraction; Violaceae; vaby; cytotoxic; genotoxic; cell penetrating; microautoradiography; LC-MS; comet assay; cycloviolacin O2; Farmakognosi; Pharmacognosy;

    Sammanfattning : Cyclotides are plant proteins with a unique topology, defined as the cyclic cystine knot motif. The motif endows cyclotides with exceptional chemical and biological stability. They also exhibit a wide range of biological activities including insecticidal, cytotoxic, anti-HIV and antimicrobial effects. LÄS MER