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1
Content available Surface acoustic wave low insertion loss delay line for applications in sensors
Soluch W.
Materiały Elektroniczne
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2016
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T. 44, nr 1
4--6
EN
It was shown that low insertion loss of a surface acoustic wave (SAW) delay line could be achieved when strong triple transit signals (TTS) are present. As an example, low insertion loss delay line on YZ LiNbO3, was developed. Double electrodes were used in interdigital transducers (IDTs) and in a screen. At a frequency of 62 MHz, insertion loss of about 8 dB, was obtained. Low insertion loss and narrow bandwidth make this SAW delay line attractive for applications in physical and gas sensors.
PL
Wykazano, że mała tłumienność wtrącenia linii opóźniającej z akustyczną falą powierzchniową (AFP) jest możliwa do uzyskania, gdy występuje silny sygnał trzeciego echa (STE). Jako przykład, opracowana została linia opóźniająca na podłożu YZ LiNbO3. W przetwornikach międzypalczastych i w ekranie zastosowano podwójne elektrody. Na częstotliwości 62 MHz uzyskano tłumienność wtrącenia około 8 dB. Mała tłumienność wtrącenia i wąskie pasmo czynią tę linię atrakcyjną do zastosowań w czujnikach fizycznych i gazowych.
2
Content available Czujnik lepkości cieczy z akustycznym modem płytowym na niebianie litu o orientacji YZ
Wróbel T., Hechner J.
Materiały Elektroniczne
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2011
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T. 39, nr 2
3-7
PL
W artykule przedstawiono wyniki badań wpływu lepkości akustycznej cieczy na własności wybranego akustycznego modu płytowego w niobianie litu o orientacji YZ, oraz konstrukcję i parametry czujnika lepkości cieczy.
EN
Experimental results of the influence of liquid viscosity on the characteristics of acoustic plate mode (APM) on LiNbO3 YZ have been presented. The structure and parametres of an acoustic plate mode (APM) sensor for liquid viscosity measurement have been reported.
3
Content available remote Temperature dependence of linear electrooptic coefficients r ₁₁₃ and r ₃₃₃ in lithium niobate
Górski P., Ledzion R., Bondarczuk K., Kucharczyk W.
Opto-Electronics Review
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2008
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Vol. 16, No. 1
46-48
EN
A new method of determination of individual linear electrooptic coefficients is proposed. The technique is based on the dynamic polarimetric measurements and takes into consideration the temperature dependences of ordinary and extraordinary refractive indices. Results obtained for the electrooptic coefficients r ₁₁₃ and r ₃₃₃ in LiNbO₃ are presented. The coefficients are found to increase significantly within the considered temperature range 25-200°C. The temperature dependences of the intrinsic coefficients m ₁₁₃ and m ₃₃₃ defined in terms of the induced polarisation, are considered as well.
4
Content available remote Morphology of laser-induced damage of lithium niobate and KDP crystals
Krupych O., Dyachok Y., Smaga I., Vlokh R. O.
Optica Applicata
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2008
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Vol. 38, nr 3
567-574
EN
The regularities of laser-induced damage are studied for LiNbO3 and KDP single crystals. It is shown that the shape of damage in the dielectric crystals depends on the elastic symmetry of crystal and the propagation direction of laser beam. When the beam propagates along the optic axis of those crystals, the figures of laser damage are six-point stars for LiNbO3 and four-point ones for KDP crystals. For the beam direction parallel to the X and Y axes in the KDP crystal, the damage initially has a cross-like configuration, with splitting of Z-oriented crack into two cracks during its further evolution.
5
Content available remote Photoluminescence studies of TM and RE doped oxides using diamond anvil cell
Kaminska A.
Optica Applicata
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2006
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Vol. 36, nr 2-3
163-179
EN
The present status of high-pressure research with the diamond anvil cell (DAC) is described, focusing mainly on use of this technique in optical spectroscopy. After a brief description of the history of the development of high-pressure measurements, the principles of DAC technique are described in more detail. Then different applications of this technique to high-pressure research are discussed, including optical spectroscopy, electrical measurements, X-ray diffractometry and other measurements. Results obtained for selected materials, with a view to illustrating the physics behind high-pressure phenomena, are presented and discussed. These include high-pressure luminescence studies of Cr3+ or Yb3+-doped lithium niobate crystal (LiNbO3) as well as Cr3+ and Nd3+-doped lanthanum lutetium gallium garnet crystal (La3Lu2Ga3O12). Finally, the boundary of high-pressure spectroscopy usefulness is shown. The example of such a case is the study of Cr3+-doped MgO-2.5Al2O3 non-stoichiometric green spinel.
6
Content available remote Temperature dependence of the electrooptic coefficients r ₂₂ and m ₂₂ in LiNbO₃
Górski P., Bondarczuk K., Kucharczyk W.
Opto-Electronics Review
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2004
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Vol. 12, No. 4
459-461
EN
Measurements of temperature dependence of linear electrooptic coefficients defined in terms of the electric field r ₂₂ and the induced polarization m ₂₂ were made for LiNbO₃ within the temperature range 25°C-200°C. After annealing, the coefficient r ₂₂ in samples with xc =49.3% is found to be nearly temperature independent, increasing at 125°C only 0.6%. Contrary to the commonly observed temperature behaviour of intrinsic coefficients, m ₂₂ instead of r ₂₂, changes significantly with temperature.
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