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Efficiency of GaAs-Based Pulsed Terahertz Emitters

100%
Reklaitis A.
Acta Physica Polonica A
|
2008
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vol. 113
|
issue 3
903-908
EN
Terahertz emission from the electron-hole plasma excited by a femtosecond optical pulse in GaAs-based emitters is studied by the Monte Carlo simulations. The THz energy radiated from the n- and p-doped GaAs surface THz emitters, from the contactless p-i-n emitter, and from the photoconductive emitter is evaluated. The obtained results show that the THz energy radiated by the photoconductive emitter exceeds the energy radiated by the surface and p-i-n THz emitters by more than one order of magnitude.
2
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Laboratory System for Quantum Cascade Lasers Researching

100%
Mikołajczyk J., Pichola W., Wojtas J., Mamajek M., Garlińska M., Prokopiuk A., Bielecki Z.
Acta Physica Polonica A
|
2013
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vol. 124
|
issue 3
505-508
EN
The paper presents a prototype of a driving system designed to laboratory investigations of quantum cascade lasers. Significant requirements of these lasers operation, as well as a construction of the main components of the system were analyzed. During the performed investigations, a tuning range of both current pulses and temperature control operation were determined. Additionally the method of monitoring both current and voltage of the lasers was also described. As a summary, results of laboratory studies of the system with the use of commercial quantum cascade lasers were presented.
3
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Efficient Terahertz Emission from InGaN/GaN Heterostructure

88%
Reklaitis A.
Acta Physica Polonica A
|
2011
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vol. 119
|
issue 2
212-214
EN
Terahertz emission from the freestanding InGaN/GaN heterostructure illuminated by femtosecond optical pulse is considered using Monte Carlo simulations. The results of Monte Carlo simulations show that the power of terahertz emission from InGaN/GaN heterostructure exceeds the power of the emission from InN surface by one order of magnitude.
4
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The Characterization of Defects in Multi-Layered Composite Materials by Thermal Tomography Methods

88%
Swiderski W.
|
EN
The idea of thermal tomography is slicing a work piece for some in-depth layers which exhibit the distribution of thermal properties in materials by the analogy with X-ray tomography. Thermal tomography is based on the analysis of the surface temperature evolution which follows thermal stimulation of test samples. In this paper, some experimental results of applying the dynamic thermal tomography algorithm to a carbon fibre reinforced plastic sample are presented. The efficiency of few data processing methods is discussed.
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