Fyzikální ústav Akademie věd ČR

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Research at Department 21

Study of refraction occurring during x-ray diffraction and its applicationResearch subjects

We have developed various types of x-ray synchrotron radiation monochromators with some additional properties: focusing, collimating, beam splitting and harmonics filtering. This, so called diffractive-refractive optics, was entirely developed in our group and was published in more than 20 papers and one book.

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Research in the field of x-ray crystal optics for synchrotron radiationResearch subjects

   Research is focused on development of dynamical theory of x-ray diffraction on perfect crystals and the utilization of the results for the design and realization of new x-ray optical elements based on Si single crystals. In the collaboration with the Czech company Polovodice a.s. and by utilization of the optical laboratory and...

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Optical spectroscopy of crystals, ceramics, thin films, and nanostructures of dielectric and semiconducting materials suitable for application in optic, optoelectronic, microelectronic, acoustooptic, pyroelectric, and piezoelectric devices.Research subjects

The aim of study of photoluminescence, thermoluminescence and optical absorption in the UV, visible, and IR spectral range is to reveal intrinsic point defects and impurities, to elucidate their electronic structure, and to determine their influence on material properties. Special attention is paid to optical properties of transition metal ions...

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A "soft electronic band" and the negative thermooptic effect in strontium titanateSelected results

The optical properties of strontium titanate (SrTiO3) single crystals were determined with spectroscopic ellipsometry in the 1–6 eV spectral region and the 4.2–300 K temperature region.New results regarding features of band edge and near band edge indirect and direct fundamental optical transitions were obtained and updated.It was shown that...

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Spectroscopic ellipsometry applied to phase transitions in solids: possibilities and limitationsSelected results

The possibilities of in situ spectroscopic ellipsometry applied to phase transitions investigation in oxide thin films and crystals are examined in this work, along with the use of various parameters calculated from ellipsometric data (band gap energy Eg, refractive index n and surface roughness) together with the directly measured main...

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Výroba jednočočkového koncentrátoru energieSelected results

   Na oddělení byla realizována výroba jednočočkového koncentrátoru energie. Čočka o mechanickém průměru 190 mm z materiálu BK7 má zadní plochu rovinnou a přední plocha je asférická za účelem dosažení zadaných optických parametrů. Volba použít asférickou plochu i přesto,že je výrobně náročná, se zdá optimální z požadavku co nejmenší...

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Optická dílnaWorking groups

   Dílna disponuje pro dělení materiálu několika typy pil. Základ tvoří sintrované diamantové pily s vnějším řezem, jež jsou zastoupeny třemi stroji s rozsahem zpracování od průměru obrobku 300mm do několika milimetrů. Pro přesnější řezy používáme pily s vnitřním řezem, kde největší zpracovatelný obrobek je cca 40mm. Posledním...

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