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SMV-2023-40: Characterization of sources and optical elements of coherent optics and use for commercial devices
Holá, Miroslava ; Řeřucha, Šimon ; Pravdová, Lenka ; Čížek, Martin
The contract research was focused on the characterization of the laser source. The characterization of the laser source was divided into two parts. The first part was focused on characterizing the optical frequency of the laser source for at least 100 hours with a resolution better than 100kHz. The second part concerned the zero-drift characterization of a common-path differential interferometer. It was a measurement of interference phase fluctuations during the reflection of interferometer arm beams on a common mirror (zero-drift) lasting at least 100 hours with a resolution better than 1 nm for a pair of differential interferometers with simultaneous measurement of atmospheric parameters.
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SMV-2023-39: Controller for the distance measuring probe
Holá, Miroslava ; Řeřucha, Šimon ; Čížek, Martin ; Pavelka, Jan ; Hucl, Václav
Measurements using a laser interferometer are among the most accurate types of distance measurements. In order to achieve this goal, it is necessary not only to have a precise laser source and an interferometer but also a controller, which ensures the correct recording and reading of the experimental data. The contract research „Controller for a distance measuring probe“ was focused on the realization of such a controller. The controller contains several service modules which ensure correct recording and reading of measured data and several related accessories. It reads and records data from a laser interferometer and also from a module which records atmospheric data necessary for the measured distance determination.
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SMV-2023-09: Design and deposition of thin film optical coatings
Pokorný, Pavel ; Oulehla, Jindřich
A study of the possibilities of optical filters production. The optical properties of the filters must comply with those required by the customer. Theoretical calculations are verified by depositing a series of samples by means of electron beam evaporation. In particular, low pass and high pass filters, dichroic mirrors, spectral transmittance correcting filters, antireflective coatings and beam splitters for various angles of incidence will be tested.
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SMV-2023-42: Materials for thermal management
Králík, Tomáš
This contract research dealt with so-called solar white coatings with a very different ability to absorb visible radiation and emit thermal radiation. We have studied special coatings designed for the space environment with high emissivity in the field of thermal radiation and at the same time low absorption of radiation originating from the sun or reflected from cosmic bodies. This type of coating is intended for passive thermoregulation of parts of apparatus moving in the space environment. The aim was to determine the so-called total hemispheric emissivity of each of the samples at the required temperatures. For these coatings, the client's goal was also to evaluate the effect of the morphology of the sample on the resulting emission of thermal radiation. Namely, we tested the flat and pyramidal structured surface of the base material. This unique research required a special modification of the supplied samples, modification of the dedicated method for measuring emissivity and absorptivity at cryogenic temperatures, as well as a new procedure for calibration and evaluation of the received data. We used a previously developed shielding ring around the perimeter of the samples to cover the perimeter of the structured samples, which prevented part of the measured thermal radiation from escaping. The results of this research will be used in the design of the CO2M space mission for monitoring CO2 emissions.
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SMV-2023-41: Absorptive coatings for quantum computers
Králík, Tomáš
This contract research focused on the thermal analysis of absorptive layers created by anodic oxidation on aluminium alloy, which are optimized for use at extremely low temperatures. These specific layers were designed for the low-temperature parts of quantum computers, where they play a key role in eliminating the reflection of thermal radiation from the hotter areas of the computer cryostat to the ultra-low temperature areas. Other key requirements for these absorptive layers are high thermal conductivity, necessary for efficient heat transfer within a quantum computer, good mechanical stability and extremely low outgassing to ensure long-term functional behaviour of the layers in challenging low-temperature conditions. The goal of this research was not only to verify the total hemispheric emissivity of three specific types of coatings in the temperature range from 10 K to 300 K. In this case, emissivity is a suitable indicator of the thermal absorptive behaviour of the layer. A study of the emissivity of these layers in the entire spectrum of temperature conditions relevant for quantum computers was carried out. This extensive analysis was intended to provide an insight into the suitability of these absorptive layers for applications in the field of low-temperature technologies, with an emphasis on the requirements of quantum computers.
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