Sökning: "Gratings"

Visar resultat 6 - 10 av 80 avhandlingar innehållade ordet Gratings.

1. 6. Spectral control of lasers and optical parametric oscillators with volume Bragg gratings

   Författare :Björn Jacobsson; Fredrik Laurell; Uwe Morgner; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; volume Bragg gratings; single-longitudinal-mode laser; laser tuning; erbium; neodymium; ytterbium; nonlinear optics; optical parametric oscillator; KTP; tunable optical parametric oscillator; narrowband optical parametric oscillator; Physics; Fysik;

   Sammanfattning : I den här avhandlingen visas hur lasrar och optiska parametriska oscillatorer (OPO:er) kan styras spektralt med hjälp av volymbraggitter. Volymbraggitter utgörs av ett periodiskt varierande brytningsindex som skrivits i ett fototermorefraktivt glas. LÄS MER

3. 7. Realization and characterization of fibre bragg gratings

   Författare :Ingermar Petermann; KTH; []
   Nyckelord :;

   Sammanfattning : .... LÄS MER

4. 8. Technology for photonic components in silica/silicon material structure

   Författare :Lech Wosinski; KTH; []
   Nyckelord :silica-on-silicon technology; PECVD; plasma deposition; photonic integrated circuits; planar waveguide devices; UV Bragg gratings; photosensitivity; arrayed waveguide gratings; multimode interference couplers; add-drop multiplexers;

   Sammanfattning : The main objectives of this thesis were to develop a lowtemperature PECVD process suitable for optoelectronicintegration, and to optimize silica glass composition forUV-induced modifications of a refractive index in PECVDfabricated planar devices. The most important achievement isthe successful development of a low temperature silicadeposition, which for the first time makes it is possible tofabricate good quality low loss integrated components whilekeeping the temperature below 250oC during the entirefabrication process. LÄS MER

5. 9. Semiconductor Lasers with Gratings Defined by Electron Beam Lithography

   Författare :Torgil Kjellberg; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; lasers; field-stitching errors; single-mode stability; fiber-optic communication;

   Sammanfattning : This thesis deals with the fabrication and characterization of semiconductor lasers with gratings defined by electron-beam lithography (EBL). Both distributed-feedback (DFB) lasers for fiber-optic communication and grating-surface-emitting (GSE) lasers suitable for a number of novel applications, from free-space communication to optical processing, are treated. LÄS MER

7. 10. Photonic devices with MQW active material and waveguide gratings : modelling and characterisation

   Författare :Nadeem Akram; Lars Thylén; Hartmut Hillmer; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Method of Lines; Grating; ARROW Waveguide; Semiconductor laser; quantum well; Photonics; Fotonik;

   Sammanfattning : The research work presented in this thesis deals with modelling, design and characterisation of passive and active optical waveguide devices. The rst part of the thesis is related to algorithm development and numerical modelling of planar optical waveguides and gratings using the Method of Lines (MoL). LÄS MER