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New experimental device at Optics and spectroscopy laboratory

Posted by admin on Nov 6, 2017

Experimental procedure. To carry out one or another type of studies on the effects of solar radiation and the experimental determination of the effectiveness of solar energy concentrators, you need, above all, a source of radiation which spectrum is close to the sun spectrum in outer space or near the Earth’s surface. Therefore, one of the most important components of system test stations is a solar simulator. As is known, considerable remoteness of Sun from Earth leads to the fact that solar rays incident on the objects in cosmic space or on the Earth’s surface in parallel, while the artificial radiation sources are located at relatively short distances from the surface of the test product. Solar simulator (SS) designed to simulate solar radiation. An important requirement of the SS is its minimum impact on the simulation of temperature and humidity regimes in the measuring chamber. SS includes light sources (lamps), forming optical devices (FOD), devices for radiation input into the chamber, reflecting mirror systems, power supplies for lamps, filters, measuring and control devices for simulator and its individual systems, as well as other auxiliary systems. The luminescent properties of the samples were tested using the newly developed experimental installation, LUMEN. The installation (Figure 2) provides ample opportunities for research in the field of fluorescent UV-visible spectroscopy with energy resolution at different temperatures. Fig. 2. LUMEN laboratory installation Figure 3 shows the scheme of optical measurements using LUMEN installation. The installation was mounted using standard serial equipment has been collected on the basis of equipment from serial production and two monochromators. To excite luminescence, a primary monochromator was used. In order to eliminate higher orders of diffraction gratings, quartz or LiF filters were arranged on the output window of the primary monochromator. Optical scheme of the primary monochromator provided UV radiation spot size 2 х 0.15 мм2 on the sample. The second monochromator was used for the registration of luminescence in UV and visible spectral regions. At the exit of the monochromator, a solar-blind photomultiplier was arranged to measure luminescence spectra. LUMEN installation operations, regimes of temperature and measurement range selection, were computer controlled, and processing of luminescence spectra was carried using special software. Fig.3 The scheme of LUMEN experimental installation. As a light source, DKsEL 1000-5 ultra-high pressure xenon lamp was used. For this xenon lamp, a high-aperture illuminator was specially made from KU quartz glass. The power of the xenon lamp radiation spectrum (240 nm to 360 nm) was 1,000 kW. The samples under investigation were placed within the working chamber on a copper crystal holder of a blow nitrogen cryostat that provided high vacuum not worse than 2·10– 6 Torr to guarantee the needed purity of the crystal surface at low temperature experiments. The registration system made it possible to measure the luminescence spectra in different spectral points at the selective photoexcitation to 3.5 eV, as well as the luminescence spectra within the range of 1.2 -3.5...

Our student defended master degree thesis

Posted by admin on Jun 24, 2017

Our student Anush Badalyan defended master degree thesis on “Investigations of electronic structures of optical materials using spectroscopy in the visible region of the spectrum”. Here is full thesis in Russian language: Anush Badalyan...

Russian Basalt.Today web portal about our invention

Posted by admin on Apr 25, 2017

Basalt.Today – independent information and news web-portal, that publishes popular science articles, dedicated to manufacturing technologies, application, and research in the field of products produced from basalt raw materials and basalt-based composites recently published an article about our inventions. The link to the original article is given below: Armenia used super-thin basalt fiber to develop a highly efficient filtration system for nuclear power...

A new Cyclotron arrived on 18 March, 2015

Posted by admin on Dec 24, 2015

The cyclotron is purchased from a Belgian Company (IBA) and the plan is to start installation of the new 18 MeV cyclotron in January of 2015. The cyclotron will be placed in a newly constructed, and specially designed building on the grounds of the laboratory. The new cyclotron, the Cyclone 18, is one of the most modern cyclotrons produced today in the world. The cyclotron will produce proton beams of up to 18 MeV energies. APRD plans to conduct a series of experiments concerning radiation phenomena in 18 MeV proton irradiated silicon single...