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SMV-2015-21: Optical frequency reference for visible spectral range
Lazar, Josef ; Hrabina, Jan ; Holá, Miroslava ; Oulehla, Jindřich ; Pokorný, Pavel
The content of this contractual research project for the institute of biophysical chemistry was a research and development of an optical frequency reference for the stabilization of a laser for spectroscopy in the visible spectral range. Spectroscopy measurements with a stabilized laser improve significantly the precision of the measurement thanks to direct traceability of the optical frequency to specific transitions in a suitable absorbing media that are listed in the recommendations of the international metrology commission. The reference is represented by a medium of ultrapure vapour of molecular iodine filed into a cell. The optical design of the cell includes windows with antireflexion coatings and a design with multipass arrangement.
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SMV-2015-38: Theoretical study of laser source for precise optical frequencies distribution
Hrabina, Jan ; Pravdová, Lenka ; Čížek, Martin ; Pham, Minh Tuan ; Hucl, Václav ; Řeřucha, Šimon ; Číp, Ondřej
The contractual project was oriented to theoretical study of design of ultra-stable laser source for precise optical frequencies long-range distribution through standard telecom optical fiber links. The research included theoretical investigation of possible optical setup arrangements with selection of optimal spectroscopy methods for the laser source frequency stabilization, special care was taken about ultra-high coherence of the laser needed for long-range distribution of the transmitted signals (hundreds of kilometers long links). The stabilization method was selected with respect to metrological traceability of the intended applications. The proposed optical system was compared to up-to-date available laser sources working at other wavelengths and crucial spectral and frequency stability parameters were summarized and compared. Proposed laser spectroscopy method and optical setup was experimentaly evaluated at laboratory environmental conditions and resulted stability/spectral parameters were summarized.
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SMV-2015-24: Optical frequency references for laser spectroscopy
Hrabina, Jan ; Holá, Miroslava ; Oulehla, Jindřich ; Pokorný, Pavel ; Lazar, Josef
The contractual project was oriented to development and research of novel types of absorption cells for laser spectroscopy applications – these cells are intended for frequency stabilization of ultra-stable laser standards and investigation of spectral parameters of unknown liquids and gaseous environments. Novel methods for preparation of antireflection coatings on optical windows were investigated due to strict request for minimalization of optical losses and backreflections of interacting laser light at optical windows of the developed cells. Research of methods for thermal protection of the optical windows during the welding process was oriented to unique approach of inert gas jet cooling of AR coatings. Investigation of possibility of AR coatings homogenization was done by method of thermal baking at different temperature levels.
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