Sökning: "BRAGG GRATINGS"

Visar resultat 21 - 25 av 32 avhandlingar innehållade orden BRAGG GRATINGS.

1. 21. Grating Based Lasers for Photonic Integration and Surface Emission

   Författare :Peter Modh; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; integrated optics; surface-emitting lasers; laser resonators; optical planar waveguide couplers; unstable-resonator lasers; semiconductor lasers;

   Sammanfattning : This thesis deals with the fabrication and characterization of grating-based integration-compatible semiconductor lasers. Waveguide gratings provide feedback for the laser resonators, and are used to diffract the laser output out of the waveguide for surface-emission. LÄS MER

3. 22. Photonic MEMS for optical information technologies

   Författare :Carlos Errando-Herranz; Kristinn B. Gylfason; Wolfram Pernice; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Micro-electro-mechanical systems MEMS ; photonics; silicon photonics; photonic integrated circuits PIC ; lithium niobate photonics; ring resonator; polarization beam splitter PBS ; microfluidic integration; lab-on-chip LoC ; optical beam steering; nonlinear optics; Electrical Engineering; Elektro- och systemteknik; Fysik; Physics; Teknisk materialvetenskap; Materials Science and Engineering;

   Sammanfattning : Photonic integrated circuits (PICs) combine hundreds of optical components on a chip, and can enable fast communications, high-performance computing, and improved sensing. PICs, made by miniaturized optical waveguides, require many reconfigurable elements to enable programmable functionalities and to compensate for fabrication variations and environmental factors. LÄS MER

4. 23. Compact diode-pumped solid-state lasers

   Författare :Stefan Spiekermann; KTH; []
   Nyckelord :visible lasers; UV lasers; solid-state lasers;

   Sammanfattning : Compact diode-pumped solid-state lasers (DPSSL) arecontinuously replacing traditional gas lasers as well asenabling completely new technology. However, compact and costefficient designs are required to satisfy end-user demands. Theaim of this thesis was therefore to investigate novel laserdesigns for given applications considering these demands. LÄS MER

5. 24. Fabrication and Characterization of Integration Compatible Semiconductor Lasers

   Författare :Mats Hagberg; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : This thesis deals with the fabrication and characterization of integration compatible semiconductor lasers. An extensive investigation of electron-beam lithography (EBL) and chemically assisted ion beam etching (CAIBE) for the fabrication of vertical ultra- high quality facets in GaAs, as well as a systematic characterization of grating coupled surface emitting lasers is presented. LÄS MER

7. 25. Laser Remote Sensing for Environmental Monitoring

   Författare :Zuguang Guan; Atomfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fiber-optic sensor; gas analysis; food-package monitoring; multiple scattering; zero-background measurement; diode laser spectroscopy; ecological study; aerosol; trace pollutant; LIDAR; laser-induced fluorescence; DIAL; methane monitoring;

   Sammanfattning : This thesis studies the techniques of laser remote sensing and their applications in environmental monitoring, as documented in several published papers. The environment where the human being live is degrading with an accelerating speed. LÄS MER