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Investigations of Quantum Cascade Lasers for Free Space Optics Operating at the Wavelength Range of 8-12 μm

100%
Nowakowski M., Gutowska M., Szabra D., Mikołajczyk J., Wojtas J., Bielecki Z.
Acta Physica Polonica A
|
2011
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vol. 120
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issue 4
705-708
EN
The paper presents analysis and preliminary investigations of quantum cascade lasers for free space optics. The lasers radiate in the long wavelength IR spectral range (8-12 μm). Because of lower effects of radiation scattering than in the case of 1.5 μm free space optics, better transmission range can be obtained. The main task of the work was experimental investigation of quantum cascade lasers taking into consideration free space optics applications. In the research, quantum cascade lasers operating in both pulse and continuous wave modes were used. The lasers spectra as well as the operation characteristics (e.g. voltage vs. current) were measured. In conclusion, the quantum cascade lasers parameters for free space optics system applications are summarized.
2
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Construction and Characterisation of Double Layer Capacitors

61%
Stević Z., Rajčić-Vujasinović M., Bugarinović S., Dekanski A.
Acta Physica Polonica A
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2010
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vol. 117
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issue 1
228-233
EN
Electrochemical double-layer capacitor (also called supercapacitor) is an electrochemical energy storage device with a high power density, which could be used in application such as pulse power devices or electric vehicles. The paper describes construction of an electrochemical double-layer capacitor that consists of two electrodes immersed in an electrolyte with a separator between them. One electrode consists of a current collector in contact with the active material, while the other one is a counter electrode. Commercially available activated carbon (AC) material, composite RuO_{2} + AC and natural copper sulfides are used as the active electrode material. Characterization has been performed by an electrochemical system fully developed at Technical Faculty in Bor. The system is based on a PC P4, a commercially available ADDA converter and an external interface for analog signal processing. The software platform is LabVIEW 8.2 package and application software is adapted to investigations of the systems containing high capacitances.
3
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The cubic period-distance relation for the Kate reversible pendulum

51%
Rossi M., Zaninetti L.
Open Physics
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2005
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vol. 3
|
issue 4
636-659
EN
We describe the correct cubic relation between the mass configuration of a Kater reversible pendulum and its period of oscillation. From an analysis of its solutions we conclude that there could be as many as three distinct mass configurations for which the periods of small oscillations about the two pivots of the pendulum have the same value. We also discuss a real compound Kater pendulum that realizes this property.
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