Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Laser-heated_pedestal_growth> ?p ?o }
Showing triples 1 to 59 of
59
with 100 triples per page.
- Laser-heated_pedestal_growth abstract "Laser-heated pedestal growth (LHPG) or laser floating zone (LFZ) is a crystal growth technique. The technique can be viewed as a miniature floating zone, where the heat source is replaced by a powerful CO2 or YAG laser. Among all the modern techniques for growing crystals from the melt (liquid/solid phase transition), it has become one of the most powerful for materials research. The main advantages of this technique are the high pulling rates (60 times greater than the conventional Czochralski technique) and the possibility of growing materials with very high melting points. In addition, LHPG is a crucible-free technique, which allows single crystals to be grown with high purity and low stress. The geometric shape of the crystals (the technique can produce small diameters), and the low production cost, make the single-crystal fibers (SCF) produced by LHPG suitable substitutes for bulk crystals in many devices, especially those that use high melting point materials. However, single-crystal fibers must have equal or superior optical and structural qualities compared to bulk crystals to substitute for them in technological devices. This can be achieved by carefully controlling the growth conditions.Until 1980, laser-heated crystal growth used only two laser beams focused over the source material. This condition generated a high radial thermal gradient in the molten zone, making the process unstable. Increasing the number of beams to four did not solve the problem, although it improved the growth process. The largest improvement to the laser-heated crystal growth technique was made by Fejer et al., who incorporated a special optical component known as a reflaxicon, consisting of an inner cone surrounded by a larger coaxial cone section, both with reflecting surfaces. This optical element converts the cylindrical laser beam into a larger diameter hollow cylinder surface. This optical component allows radial distribution of the laser energy over the molten zone, reducing radial thermal gradients. The axial temperature gradient in this technique can go as high as 10000 °C/cm, which is very high when compared to traditional crystal growth techniques (10–100 °C/cm).Another interesting feature of the LHPG technique is its high convection speed in the liquid phase due to Marangoni convection. The video presented in the following reference shows the liquid phase convection during lithium niobate (LiNbO3) fiber pulling using a very small piece of platinum wire inside the liquid that is allowed to spin. It is possible to see that it spins very fast. Even when it appears to be standing still, it is in fact spinning fast on its axis.".
- Laser-heated_pedestal_growth wikiPageID "20094074".
- Laser-heated_pedestal_growth wikiPageLength "8867".
- Laser-heated_pedestal_growth wikiPageOutDegree "29".
- Laser-heated_pedestal_growth wikiPageRevisionID "678944301".
- Laser-heated_pedestal_growth wikiPageWikiLink Carbon_dioxide_laser.
- Laser-heated_pedestal_growth wikiPageWikiLink Category:Condensed_matter_physics.
- Laser-heated_pedestal_growth wikiPageWikiLink Category:Crystallography.
- Laser-heated_pedestal_growth wikiPageWikiLink Category:Crystals.
- Laser-heated_pedestal_growth wikiPageWikiLink Category:Materials_science.
- Laser-heated_pedestal_growth wikiPageWikiLink Category:Mineralogy.
- Laser-heated_pedestal_growth wikiPageWikiLink Convection.
- Laser-heated_pedestal_growth wikiPageWikiLink Crucible.
- Laser-heated_pedestal_growth wikiPageWikiLink Crystal.
- Laser-heated_pedestal_growth wikiPageWikiLink Crystal_growth.
- Laser-heated_pedestal_growth wikiPageWikiLink Crystal_structure.
- Laser-heated_pedestal_growth wikiPageWikiLink Crystallite.
- Laser-heated_pedestal_growth wikiPageWikiLink Crystallization.
- Laser-heated_pedestal_growth wikiPageWikiLink Crystallization_(engineering_aspects).
- Laser-heated_pedestal_growth wikiPageWikiLink Czochralski_process.
- Laser-heated_pedestal_growth wikiPageWikiLink Czochralski_technique.
- Laser-heated_pedestal_growth wikiPageWikiLink Fractional_crystallization_(chemistry).
- Laser-heated_pedestal_growth wikiPageWikiLink Lithium_niobate.
- Laser-heated_pedestal_growth wikiPageWikiLink Marangoni_effect.
- Laser-heated_pedestal_growth wikiPageWikiLink Melting_point.
- Laser-heated_pedestal_growth wikiPageWikiLink Micro-pulling-down.
- Laser-heated_pedestal_growth wikiPageWikiLink Nucleation.
- Laser-heated_pedestal_growth wikiPageWikiLink Phase_transition.
- Laser-heated_pedestal_growth wikiPageWikiLink Platinum.
- Laser-heated_pedestal_growth wikiPageWikiLink Protocrystalline.
- Laser-heated_pedestal_growth wikiPageWikiLink Recrystallization_(metallurgy).
- Laser-heated_pedestal_growth wikiPageWikiLink Seed_crystal.
- Laser-heated_pedestal_growth wikiPageWikiLink Single_crystal.
- Laser-heated_pedestal_growth wikiPageWikiLink Temperature_gradient.
- Laser-heated_pedestal_growth wikiPageWikiLink Yttrium_aluminium_garnet.
- Laser-heated_pedestal_growth wikiPageWikiLinkText "Laser-heated pedestal growth".
- Laser-heated_pedestal_growth hasPhotoCollection Laser-heated_pedestal_growth.
- Laser-heated_pedestal_growth wikiPageUsesTemplate Template:Colbegin.
- Laser-heated_pedestal_growth wikiPageUsesTemplate Template:Colend.
- Laser-heated_pedestal_growth wikiPageUsesTemplate Template:Crystallization.
- Laser-heated_pedestal_growth wikiPageUsesTemplate Template:Reflist.
- Laser-heated_pedestal_growth subject Category:Condensed_matter_physics.
- Laser-heated_pedestal_growth subject Category:Crystallography.
- Laser-heated_pedestal_growth subject Category:Crystals.
- Laser-heated_pedestal_growth subject Category:Materials_science.
- Laser-heated_pedestal_growth subject Category:Mineralogy.
- Laser-heated_pedestal_growth hypernym Technique.
- Laser-heated_pedestal_growth type Software.
- Laser-heated_pedestal_growth type Biophysic.
- Laser-heated_pedestal_growth type Physic.
- Laser-heated_pedestal_growth type Subfield.
- Laser-heated_pedestal_growth comment "Laser-heated pedestal growth (LHPG) or laser floating zone (LFZ) is a crystal growth technique. The technique can be viewed as a miniature floating zone, where the heat source is replaced by a powerful CO2 or YAG laser. Among all the modern techniques for growing crystals from the melt (liquid/solid phase transition), it has become one of the most powerful for materials research.".
- Laser-heated_pedestal_growth label "Laser-heated pedestal growth".
- Laser-heated_pedestal_growth sameAs Crescimento_pedestal_por_aquecimento_a_laser.
- Laser-heated_pedestal_growth sameAs m.04y8_p3.
- Laser-heated_pedestal_growth sameAs Q6492947.
- Laser-heated_pedestal_growth sameAs Q6492947.
- Laser-heated_pedestal_growth wasDerivedFrom Laser-heated_pedestal_growth?oldid=678944301.
- Laser-heated_pedestal_growth isPrimaryTopicOf Laser-heated_pedestal_growth.