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Modular System for Elemental Analysis using Laser Spectroscopy
Klempa, Tomáš ; Polach, Pavel (referee) ; Křupka, Ivan (advisor)
This diploma thesis is solved for AtomTrace Company and describes mechanical design of modular system for elemental analysis using laser spectroscopy. Object of this thesis is to create at once compact and modular system, with addition of liquid analysis module. System described in this work came out from current solution and is capable of interaction of new and previous modules. New solution is more economical both in budget and mass, whole system is fully functional and liquid analysis module with flat jet has 40 % stability, as described in experiments. The benefit of this work is possible future integration of system or separate modules into the AtomTrace portfolio and industry applications.
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Modification of Targeting Camera for a Remote Laser Spectroscopy
Klempa, Tomáš ; Ficza, Ildikó (referee) ; Brada, Michal (advisor)
The bachelor thesis deals with the modification of targeting camera for remote laser spectroscopy. Targeting camera will be used on remote laser spectroscopy unit to study its features in laboratory of Institute of Physical Engineering on University of Mechanical Engineering Brno and to study the affect of external environment to analytic ability. The thesis contains a brief overview of the current stage of knowledge, designs of stroctural variations and the description of parts of designed device.
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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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Iodine-frequency stabilized Telecom laser diode at 515 nm
Philippe, Ch. ; Du Burck, F. ; Acef, O. ; Hrabina, Jan ; Pham, Minh Tuan
We have developed an original frequency tripling process based on a compact Telecom laser diode operating around 1542 nm associated to PPLN nonlinear crystals. The optical setup is fully fibred and delivers up to 300 mW at 514 nm. This output generated green radiation is used to probe a molecular vapor inserted in a 20 cm long iodine cell developed by ISI lab. The frequency stability of that reference laser is daily controlled within few parts of 10-16 over 1000 s of integration time. Allan variance associated to the frequency stability of our iodine stabilized telecom laser diode decreases with a slope of 1.4x10-13 with a minimum value of 3x10-14 around 40 s.
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Optical diagnostic methods for energetics
Hrabina, Jan
This work is oriented to non-contacting laser spectroscopy diagnostic methods for monitoring of combustion processes in coal power plant facilities. These methods can be used for optimalization of combustion process in the chamber, which is neccessary step toward reduction of toxic gases releasing in to the atmosphere, increasing of efficiency of the combustion and reduction of overall costs needed for electricity production.
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Laser standards for interferometry and stable frequencies distribution
Hrabina, Jan
Optical frequency references - absorption cells - represent an unique tool for frequency stabilization of the laser sources. Their spectral properies define overall quality of the stabilized laser, so these properties must be precisely controlled and verified. One of the most used absorption media in the visible spectral range is molecular iodine. It offers wide and reach spectra of very narrow and strong transitions so many types of laser standards can be realized on base of this media. Testing of final properties of iodine absorption cells is traditionaly based on two methods - laser induced fluorescence method (LIF) and evaluation of absolute frequency shifts of the iodine stabilized laser (beatnote measurement). Unfortunately both of these methods have few limitations and disadvantages - in case of high-quality cells the LIF method reaches its resolution limits, the beatnote method needs quite complicated optical setup. We present a novel approach for the iodine cells quality evaluation based on measurement of hyperfine transition linewidths - the impurities in absorption media cause line broadening of the transitions. Pilot measurement shows that presented method achieves a very good sensitivity to the iodine purity and together with a need of relatively simple setup can be considered as a novel method for absorption cells quality verification.
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