W pracy przedstawiono przegląd literatury dotyczący domieszkowania węglika krzemu (SiC) – materiału półprzewodnikowego perspektywicznego dla szeregu istotnych zastosowań w sensoryce, spintronice, optoelektronice oraz w przyrządach półprzewodnikowych dużej mocy, wielkiej częstotliwości i wysokich temperatur. Zaprezentowano podstawowe parametry domieszek oraz ich wpływ na właściwości elektryczne, magnetyczne i optyczne SiC. Na tle doniesień literaturowych pokazano własne wyniki badań właściwości optycznych domieszkowanych kryształów SiC otrzymanych metodą transportu fizycznego z fazy gazowej (PVT).
EN
The paper presents a review of the literature which concerns a doping of the silicon carbide (SiC) – a semiconductor material which is a prospective material for many of important applications in sensorics, spintronics, optoelectronics and for high-power, high-frequency and high-temperature semiconductor devices. Basic parameters of dopants and their influence on electrical, magnetic and optical properties of SiC have been presented. Own results of investigations of optical properties of doped SiC crystals, obtained by physical vapor transport method (PVT), have been shown on the background of the literature.
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Progress in technology and construction of diode-pumped laser made in the 80's caused renewed intereset in diode pumping of active media of solid-state lasers (DPSSL -Diode Pumped Solid State Laser) and next their rapid development. At present, DPSSL are commonly applied in medicine and industry.The paper presents advantages of such excitation and significant improvement in generation efficiency, longer service life of devices, smaller dimensions of quantum generators and theirs power suppliers. Special attention is paid to the possibility of application of new active media (new neodymium doped hosts), including ytterbium (Yb) doped media, that have perfect functional parameters with diode pumping. Fundamental configurations of active media and their excitation methods are described. A "slab" type geometry used for high-power lasers is distinguished. It is shown that construction of, so-called, microlasers is possible when diodes are used as pumps of solid state lasers. Microlasers can generate strictly monochromatic radiation (i.e.,generate only one longitudinal mode). These lasers can be used for rangefinder transmitters and radars with heterodyne detection - new type devices applicability range of which is difficult to predict. Microlasers can be also used as frequency and length standards. A group of fibre lasers is considered and their unusual possibilities are described, among others generation of beams of high quality (M² ~1) and high-power (1 kW). The examples of construction of high-power DPSSL (3,5 kW) are presented.
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