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SMV-2023-63: Measuring interferometric systems
Mikel, Břetislav
The contract research was focused on the development of multi-axis measuring systems using the most accurate method of measurement based on the principle of laser radiation interference. The basic reference is a laser source with a wavelength of 633 nm. Measuring systems are intended for devices requiring measurement accuracy in the order of nanometers.
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SMV-2023-62: Optical beam head A
Mikel, Břetislav
A feasibility study for the development of the principle, arrangement and verification of an optical head for 637 nm wavelength, which will have an input adapted to the FC/PC fibre connector, with an output laser beam focused at a distance of 400 mm with a width of 6-10 mm, a thickness of max. 60 um and a depth of field of min. 5 mm.
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SMV-2023-61: Measuring systems for lithographers
Mikel, Břetislav
The contract research was focused on the development of multi-axis measuring systems using the most accurate method of measurement based on the principle of laser radiation interference. The basic reference is a laser source with a wavelength of 633 nm. Measuring systems are intended for devices requiring measurement accuracy in the order of nanometers.
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Splicing of special optical fibers
Hlavatý, Václav ; Holík, Milan (referee) ; Mikel, Břetislav (advisor)
The aim of thesis is to design welding processes for special optical fibers. The text describes procedures of modification of the basic welding process for three types of PM fibers. For each fiber type was created specific welding process. All optimized welding processes were tested in terms of reproducibility.
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Hollow Core Photonic Crystal Fibers
Hlavatý, Václav ; Holík, Milan (referee) ; Mikel, Břetislav (advisor)
Aim of the work was to study, design and verify methods of splicing photonic crystal fibers with standard single-mode and multi-mode fibers. The main goal was to make of the fusion splicer Fujikura FSM 100P splicing process. To create splicing process, various splicing methods were tested. Method of the moving position of the arc discharge from the center of splicing fibers and the method with increased gas pressure in the microstructure were mainly tested. Research revealed the incompatibility of splicing process of the different types of fiber splicers. The main results of the work are optimized methods of the splicing HC 1550-2 fiber and SMF 28 fiber.
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Methods of frequency stabilization of semicondutor lasers
Kozelský, Adam ; Stehlík, Jiří (referee) ; Mikel, Břetislav (advisor)
The main aim of the thesis is a frequency stabilization of the DFB semiconductor laser diodes. The temperature stability of the laser diode chip, the stability and the noise of the injection current and the backward reflections are the crucial parameters which affects the frequency stability. These influences are described and the resolution is proposed. The theory of the external methods of the frequency stabilization and the comparison of these methods is presented. One method was choosed and this method was realized for 760 and 1540 nm wavelength laser diodes. In this method was used the frequency stabilization based on the linear absorption to the spectral lines of the gases. The diploma work is closed by the measured results of the frequency stability of the used laser diodes and by the comparison of level of stability achieved by the other methods.
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Design of the method to increasing of accuracy of the tunable optical filter optical spectra measurement
Jelínek, Michal ; Holík, Milan (referee) ; Mikel, Břetislav (advisor)
The thesis deals with the method for the improvement of the measurement accuracy in the optical frequency spectra measurements based on tunable optical filters. The thesis starts with the selection of the proper optical filter that is suitable for accurate light spectrum measurement. The selected filter was then used for the design and realization of the measurement system for the inspection of the fibre Bragg gratings. The system incorporates a reference block for the compensation of environmental influences, an interferometric verification subsystem and a PC - based control software implemented in LabView. The preliminary experimental verification of the measurement principle and the measurement system functionality were carried out on a testing rig with a specially prepared concrete console in the UJV Řež. Advanced tests were conducted on nuclear power plant’s containment shape deformation measurement in Temelin.
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