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1
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Application of quantum cascade lasers to trace gas detection

100%
Bielecki Z., Wojtas J., Stacewicz T., Mikołajczyk J.
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2015
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issue 2
2
Content available remote

Cavity Enhanced Absorption Spectroscopy Sensor

100%
Nowakowski M., Wojtas J., Bielecki Z., Mikołajczyk J.
Acta Physica Polonica A
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2009
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vol. 116
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issue 3
363-367
EN
The paper presents opportunities of cavity enhanced absorption spectroscopy technique application in nitrogen oxides (NO_{x}) detection. In this method the concentration of an absorbing gas is determined by measure of decay time of the light pulse trapped in an optical cavity. The measurements are not sensitive to fluctuation of both laser power and photodetector sensitivity. The cavity enhanced absorption spectroscopy technique is a modification of cavity ring down spectroscopy technique where the off-axis adjustment of the resonator is used. NO_{x} detection is carried out in the visible and infrared range. The signal is registered with a developed low noise photoreceiver. Features of the presented sensor show that it is possible to build a portable trace gases sensor. Its sensitivity could be comparable with chemical detectors. Such a system has several advantages: relatively low price, small size and weight, and detection possibility of other gases.
3
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Compact QCL driver for free-space transmitter

88%
Mikołajczyk J., Wesołowski M., Wojtas J., Garlińska M., Bielecki Z.
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2012
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issue 4
4
Content available remote

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

76%
Nowakowski M., Gutowska M., Szabra D., Mikołajczyk J., Wojtas J., Bielecki Z.
Acta Physica Polonica A
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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.
5
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Laboratory System for Quantum Cascade Lasers Researching

76%
Mikołajczyk J., Pichola W., Wojtas J., Mamajek M., Garlińska M., Prokopiuk A., Bielecki Z.
Acta Physica Polonica A
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2013
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vol. 124
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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.
6
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Explosives Vapors–Concentrating and Optoelectronic Detection

64%
Wojtas J., Rutecka B., Popiel S., Nawała J., Wesołowski M., Mikołajczyk J., Cudziło S., Bielecki Z.
Metrology and Measurement Systems
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2014
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issue 2
7
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Transmitter with quantum cascade laser for free space optics communication system

64%
Gutowska M., Wojtas J., Pierścińska D., Nowakowski M., Pierściński K., Szabra D., Mikołajczyk J., Bielecki Z.
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2011
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issue 4
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