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Wyszukujesz frazę "spontaneous emission" wg kryterium: Temat

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    Wyświetlanie 1-3 z 3
    Tytuł:
    A simple and precise method for the threshold current determination in vertical-cavity surface-emitting lasers
    Autorzy:
    Pruszyńska-Karbownik, Emilia
    Gębski, Marcin
    Marciniak, Magdalena
    Lott, James A.
    Czyszanowski, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/174774.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    VCSEL
    vertical-cavity surface-emitting laser
    threshold current
    spontaneous emission
    Opis:
    In this paper, we present experimental results of spontaneous emission clamping in the threshold for vertical-cavity surface-emitting lasers (VCSELs) with oxide current confinement. We show that the spontaneous emission not wholly clamps in the threshold. We propose a new method for determining the threshold current value using the study of the clamping phenomena. This method has an advantage over the commonly used methods in the accuracy because the current of the spontaneous emission clamping is betted defined than the current of the slope change of the stimulated emission light-current curve. The estimated uncertainty of the method is no more than 20 μA.
    Źródło:
    Optica Applicata; 2020, 50, 2; 281-288
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Signal-to-noise analysis in a counter-pumped fiber Raman amplifier
    Autorzy:
    Felinskyi, G
    Dyriv, M
    Powiązania:
    https://bibliotekanauki.pl/articles/173582.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    amplified spontaneous emission
    fiber Raman amplifier
    optical signal-to-noise ratio
    single-mode fiber
    Raman gain
    Opis:
    The light gain efficiency due to Raman scattering in a distributed fiber Raman amplifier is a subject of our investigation. The detailed analysis of noise properties at one-wave optical signal amplification in a single-mode fiber in the scheme of counter-pumped fiber Raman amplifier is realized in the paper. Experimental results of the amplified spontaneous emission with backward pumping as a base of optical noise evaluation are presented. Raman gain spectrum for a coherent Stokes low-powered signal is calculated and it is compared with the observed spectrum of non-coherent amplified spontaneous emission noise. It is shown that an output optical signal has higher gain than the amplified spontaneous emission and it results in the appreciable growth in the output optical signal-to-noise ratio.
    Źródło:
    Optica Applicata; 2014, 44, 4; 493-501
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Role of Organic Sulfur in the Formation of Methane Emissions on the Spontaneous Combustion of Coal
    Autorzy:
    Yusuf, Maulana
    Powiązania:
    https://bibliotekanauki.pl/articles/24201715.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    spontaneous combustion of coal
    hot spot
    emission
    CH4 gas
    organic sulfur
    thiother bond
    Opis:
    Spontaneous combustion of coal is a phenomenon that often occurs in open coal mining activities, especially strip mining and open pit mining systems which are detrimental to mining companies, the economy, the environment, and society. This phenomenon causes coal mining activities to contribute to CH4 gas emissions in global warming by 11% of total global emission. The purpose of this study was to analyze the role of organic sulfur in the formation of CH4 gas emissions in the spontaneous combustion of coal in the TAL area. The approach is based on a literature review and field survey. The literature review was intended to examine the influence of geological factors, maceral analysis, and depositional environment on the rank and form of coal sulfur, while the field survey was conducted by measuring CH4 gas emissions in 36 samples of spontaneous combustion hotspots. Literature review shows that coal in the TAL area belongs to low rank (sub-bituminous/sub-bituminous B) which has high organic sulfur content in the form of thiother bonds (C-S), especially carbon disulfide (CS2). The average CH4 emission measurement in the field is 6,989 mg/m3, which is still within the limits set by other researchers, between 3,700–34,098 mg/m3. The role of organic sulfur from C–S bonds especially CS2 in the formation of CH4 gas emissions, is very dominant at 93.10% or 6,507 mg/m3 of the total coal sulfur in the TAL area. The emission of CH4 gas in the spontaneous combustion of coal is strongly influenced by geological factors, maceral analysis, and the depositional environment related to the rank and form of coal sulfur. Further, detailed, and comprehensive research on the form of organic sulfur needs to be carried out to mitigate CH4 gas emissions in the spontaneous combustion of coal in the TAL area.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 4; 192--201
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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