Sökning: "periodic poling"

Visar resultat 1 - 5 av 15 avhandlingar innehållade orden periodic poling.

1. 1. QPM Devices in KTA and RKTP

   Författare :Andrius Zukauskas; Carlota Canalias; Moti Katz; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; QPM; periodic poling; KTP;

   Sammanfattning : Even though KTiOPO4 (KTP) is considered to be one of the best nonlinear materials for quasi phase matched (QPM) frequency conversion in the visible and the near-infrared spectral regions, its use is often limited by poor material homogeneity, high ionic conductivity, a considerable linear absorption and photochromatic damage. On the other hand, the improved material homogeneity and the lower ionic conductivity of bulk Rb-doped KTP (RKTP) make this material an ideal alternative for fabrication of fine-pitch QPM gratings, while the arsenate isomorph KTiOAsO4 (KTA) promises a better performance in the green spectral region and adds the advantage of a wider transparency window in the infrared. LÄS MER

3. 2. Advanced nano- and microdomain engineering of Rb-doped KTiOPO4 for nonlinear optical applications

   Författare :Charlotte Liljestrand; Carlota Canalias; Sunao Kurimura; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; KTiOPO4; nonlinear optics; MOPO; quasi-phase matching; SHG; ferroelectrics; domain structuring; periodic poling; Fysik; Physics;

   Sammanfattning : Fine-pitch ferroelectric domain gratings are extensively used for generation of light in the visible and near-infrared spectral regions through quasi-phase matched (QPM) frequency conversion. Sub-μm QPM devices enables demonstration of nonlinear optics with counterpropagating waves, a field of nonlinear optics which remains sparsely explored due to the difficulty of fabricatinghigh quality gratings. LÄS MER

4. 3. Components based on optical fibers with internal electrodes

   Författare :Niklas Myrén; KTH; []
   Nyckelord :Poling; twinhole fiber; fiber electrodes; silver film electrodes; silver diffusion; quasi-phase matching; optical switching; frequency conversion; optical modulation;

   Sammanfattning : The topic of this thesis is development ofdevices fortelecom applications based on poled optical fibers. The focusis on two different specific functions, wavelength conversionand optical switching.Optical switching is demonstrated in a poled optical fiberat telecom wavelengths (~1.55 mm). LÄS MER

5. 4. Poled fiber devices

   Författare :Niklas Myrén; Fredrik Laurell; Faman Kashyap; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; optical physics; Poling; twin-hole fiber; fiber electrodes; silver film electrodes; silver diffusion; quasi-phase matching; optical switching; frequency conversion; optical modulation; Fysik; Physics; Fysik;

   Sammanfattning : The topic of this thesis is the development of devices for telecom applications based on poled optical fibers. The focus is on a specific function, optical switching/modulation. Some of the most important results are summarized below. Optical switching at telecom wavelengths (1. LÄS MER

7. 5. Nonlinear response in engineered optical materials

   Författare :Gustav Strömqvist; Valdas Pasiskevicius; Peter Smith; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; nonlinear optics; nonlinear index of refraction; double tungstates; periodic poling; KTiOPO4; quasi-phase matching; parametric down-conversion; mirrorless optical parametric oscillators;

   Sammanfattning : Material and structure engineering are increasingly employed in active optical media,in this context defined as media capable of providing laser or/and optical parametric gain. For laser materials, the main aim of the engineering is to tailor the absorption and emission cross sections in order to optimise the laser performance. LÄS MER