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SMV-2015-34: Development of a new optical method for barrel rifling straightness measurement
Holá, Miroslava ; Řeřucha, Šimon ; Oulehla, Jindřich ; Lazar, Josef
The aim of the project of the contractual research was to establish an optical lab for the measuring of barrel rifling straightness and to perform laboratory measurement of samples of ballistic barrels as well as analyse the measurement data. The used method is based on the laser measuring of straightness where side deviations of a beam are detected. These deviations are caused by deviations of the position of the retroreflector while it is shifted down the measured barrel. This retroreflector copies deviations of a barrel from straightness. The measured data were analysed with the help of our measuring software. The realization of the optical lab continues the previous performed study.
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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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Absorption cells based on HC-PCF fibers
Oulehla, Jindřich
This work is oriented towards our research in the field of splicing and ending of optical frequency references based on hollow core photonics crystal fibers (HC-PCF). This type of references is very promising optical element to replacing c assic bulky absorption cells for laser frequency stabilizat on. We prepared and present methods of splicing HC-PCF to standard telecommunication fiber by a fiber splicer. A special care was taken to optimize the splicer setting and to find and obtain a splice with minimal optical losses between HC-PCF and SMF. The manufactured fiber cell was closed at one side by connecting to SMF and second fiber end was prepared for placing into the vacuum chamber with the help of vacuum-tightened connection to be used as a optical frequency reference based on the acetylene gas for frequency stabilization of the laser standards.
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