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    Wyświetlanie 1-8 z 8
    Tytuł:
    Transmitter with quantum cascade laser for free space optics communication system
    Autorzy:
    Gutowska, M.
    Pierścińska, D.
    Nowakowski, M.
    Pierciński, K.
    Szabra, D.
    Mikołajczyk, J.
    Wojtas, J.
    Bielecki, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/200097.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical link
    quantum cascade laser
    laser communications
    Opis:
    The paper presents results of experimental tests of the quantum cascade laser from Alpes Lasers company in terms of its application in the optic communication system in an open space. The measurements involved the current – voltage characteristics while measuring also the average power of emitted radiation, and spectral characteristics for different temperatures and different laser pulse durations. The duration of laser pulses was matched to parameters used in telecommunication interfaces. The construction of the transmitter module which uses the tested laser is also presented.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 419-423
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Overview of Free Space Optics with Quantum Cascade Lasers
    Autorzy:
    Mikołajczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/226628.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    quantum cascade laser
    free space optics
    laser communications
    Opis:
    The article presents an overview of the work on quantum cascade lasers application in free space optical systems (Free Space Optics - FSO). There are discussed the main issues of the open-space laser communications and their practical construction. Comparative analyses of each FSO technology were performed. Brief description of quantum cascade (QC) lasers and some developments related to the use of these lasers in optical data link are also presented. In summary, the constructed models of FSO links with QC lasers are characterized.
    Źródło:
    International Journal of Electronics and Telecommunications; 2014, 60, 3; 259-264
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoluminescence and Raman spectroscopies as an optical approach of stress determining in MOVPE grown quantum cascade laser structures
    Autorzy:
    Łozińska, Adriana
    Badura, Mikołaj
    Jadczak, Joanna
    Bielak, Katarzyna
    Ściana, Beata
    Powiązania:
    https://bibliotekanauki.pl/articles/174205.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    QCL core
    quantum cascade laser
    photoluminescence
    Raman spectroscopy
    Opis:
    In the presented work, an optical approach of stress determining in metalorganic vapor phase epitaxy (MOVPE) grown quantum cascade laser (QCL) structures was reported. In the case of such sophisticated structures containing hundreds of thin layers, it is important to minimize the stress generated in the QCL core. Techniques enabling determination of stress in such thin layers as those described in the article are photoluminescence and Raman spectroscopies. Based on Raman shift or changes in photoluminescence signal, it is possible to analyze stress occurring in the structure.
    Źródło:
    Optica Applicata; 2020, 50, 2; 289-299
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technology and properties of low-pressure metalorganic vapour phase epitaxy grown InGaAs/AlInAs superlattice for quantum cascade laser applications
    Autorzy:
    Badura, M.
    Bielak, K.
    Ściana, B.
    Radziewicz, D.
    Pucicki, D.
    Dawidowski, W.
    Żelazna, K.
    Kudrawiec, R.
    Tłaczała, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/173549.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    InGaAs
    AlInAs
    superlattice
    metalorganic vapour phase epitaxy
    MOVPE
    quantum cascade laser
    QCL
    Opis:
    Quantum cascade laser is one of the most sophisticated semiconductor devices. The active region of the quantum cascade laser consists of hundreds thin layers, thus the deposition precision is the most crucial. The main technique for the fabrication of quantum cascade laser structure is molecular beam epitaxy, however, the prevalence of metalorganic vapour phase epitaxy techniques in the fabrication of semiconductor structures causes a perpetual work on the improvement production of the entire quantum cascade laser structure by the metalorganic vapour phase epitaxy. The paper presents technological aspects connected with the metalorganic vapour phase epitaxy growth of InGaAs/AlInAs low-dimensional structures for quantum cascade laser active region emitting ~9.6 μm radiation. Epitaxial growth of superlattice made of InGaAs/AlInAs lattice matched to InP was conducted at the AIXTRON 3x2″ FT system. Optical and structural properties of such heterostructures were characterised by means of high resolution X-ray diffraction, photoluminescence, contactless electroreflectance and scanning electron microscope techniques. Epitaxial growth and possible solutions of structure improvements are discussed.
    Źródło:
    Optica Applicata; 2016, 46, 2; 241-248
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Peak detection unit for Free-Space-Optics receiver
    Autorzy:
    Achtenberg, Krzysztof
    Mikołajczyk, Janusz
    Szabra, Dariusz
    Prokopiuk, Artur
    Bielecki, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/221334.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    peak detection
    infrared receiver module for optical communications
    open path laser communications
    free space optics
    quantum cascade laser
    Opis:
    The paper presents verification of a peak detection method cooperating with infrared radiation detector module applications. The work has been divided into parts including SPICE simulations and presentation of results obtained with the constructed prototype. The design of the peak detector dedicated to applications with very short pulses requires a different approach than that for standard solutions. It is mainly caused due to the ratio of pulse width and time period. In the described application this ratio is less than 10%. The paper shows testing of an analogue circuit which is capable to be inserted in these applications.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 2; 377-385
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quartz enhanced photoacoustic spectroscopy based on an external cavity quantum cascade laser
    Autorzy:
    Xu, L.
    Zhou, S.
    He, T.
    Li, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/173669.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    external cavity quantum cascade laser
    ECQCL
    quartz enhanced photoacoustic spectroscopy
    QEPAS
    volatile organic compound
    VOC
    ethanol
    Opis:
    Mid-infrared laser spectroscopy is a powerful analytical tool for trace gases detection. In this study, a spectroscopic system based on an external cavity quantum cascade laser (ECQCL) and quartz enhanced photoacoustic spectroscopy (QEPAS) was developed for volatile organic compounds (VOCs) measurements. Primary laboratory test on ethanol spectroscopy was investigated and compared with traditional direct absorption spectroscopy (DAS). Experimental results show that the proposed QEPAS is more sensitive than the conventional DAS method. In addition, the significant linear dependence of photoacoustic signal on sample pressures and laser operating parameters was observed.
    Źródło:
    Optica Applicata; 2018, 48, 4; 687-695
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of photoluminescence excitation spectroscopy in investigation of quantum cascade lasers properties
    Autorzy:
    Wójcik-Jedlińska, A.
    Gradkowski, K.
    Kosiel, K.
    Bugajski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/378431.pdf
    Data publikacji:
    2006
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Elektronowej
    Tematy:
    lasery
    AlGaAs
    lasery kaskadowe
    fotoluminescencja
    modelowanie numeryczne
    spektroskopa
    lasers
    Quantum Cascade Laser (QCL)
    photoluminescence
    numerical simulations
    spectroscopy
    Opis:
    The properties of quantum cascade laser (QCL) structures have been investigated by optical technique based on spontaneous emission measurements: photoluminescence excitation (PLE) spectroscopy. Three types of test structures used for obtaining final QCL device were examined , i.e., single sequence of coupled quantum wells, which form an active region of the device, 30 sequences of this active region separated by 25 nm thick AlGaAs barriers and finally complete, undoped structure consisting of 30 of sequences repeated active regions and superlattice injectors. The results has been compared with numerical simulations. The role of such measurements has also been discussed.
    Źródło:
    Electron Technology : Internet Journal; 2005-2006, 37/38, 10; 1-4
    1897-2381
    Pojawia się w:
    Electron Technology : Internet Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compact QCL driver for free-space transmitter
    Autorzy:
    Mikołajczyk, J.
    Garlińska, M.
    Wesołowski, M.
    Wojtas, J.
    Bielecki, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/201659.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    free space optics
    laser communication
    quantum cascade lasers
    laser driver
    Opis:
    The paper presents investigations of a free space optical transmitter operating with quantum cascade lasers. The main goal of the research was to determine influence of lasers driver parameters on an optical data link performance. Using some commercial driving devices, the laser pulse limitations of power, repetition rate and time duration have been observed. In the paper, the preliminary results of the designed laser driver are described. The driver was developed at the Institute of Optoelectronics, MUT in cooperation with scientists from the Faculty Electrical Engineering, WUT. It is characterized by high current efficiency, high pulse repetition rate, and compact construction. Additionally, the driver also includes a controller of Peltier modules
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 4; 763-768
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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