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Wyszukujesz frazę "nonlinear refractive index" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Effect of viscosity on the far-field diffraction pattern of spatial self-phase modulation
    Autorzy:
    Nibu, A. G.
    Silpa, S. S.
    Ardra, S. N.
    Anisha, M. M.
    Ambika, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/174699.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    self-phase modulation
    nonlinear refractive index
    chlorophyll
    engine oil
    Opis:
    Effect of viscosity of a liquid on the far-field diffraction pattern due to spatial self-phase modulation is investigated. Chlorophyll extract in acetone at different concentrations is used as the low viscous nonlinear samples and commercial engine oils, synthetic and natural. It is also used as high viscous media. In the case of chlorophyll solution, the self-induced diffraction ring pattern in the far-field is a series of circular rings at the beginning; but later it is transformed to half circular symmetry. But for the high viscous engine oils we have observed circular fringes and there is no time dependent structural variation in the pattern. The coefficient of the intensity dependent nonlinear refractive index for all the liquid samples is evaluated.
    Źródło:
    Optica Applicata; 2017, 47, 4; 591-599
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Nonlinear Optical Properties of Nematic Liquid Crystal Material by Z-Scan Technique
    Autorzy:
    Mousa, Abdulazeez O.
    Kadhim, Yaseen H.
    Naser, Ban A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1189947.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Nematic liquid crystal
    Z-Scan technique
    nonlinear refractive index
    optical limiting
    Opis:
    The nonlinear optical properties of nematic liquid crystal material have been studied at different concentrations using Z-Scan technique. Experiments are performed using continuous wave (CW) diode solid state laser at 473 nm wavelength and 20 mW power. The nonlinear absorption coefficient β is calculated using open aperture Z-Scan data, while its nonlinear refractive index n2 is measured using the closed aperture Z-Scan data. In this work, six concentrations were prepared for (Di-Cinnamylidene Benzidine), these concentrations were (9×10-5, 8×10-5, 7×10-5, 6×10-5, 5× 10-5 and 4×10-5)M. The optical absorption and transmission spectra for these concentrations were measured by using UV-VIS spectrophotometer. Our results show that the nonlinearity are changed significantly with concentrations, in addition, the optical limiting behavior has been studied. The results confirmed the capability of the sample to be used as optical limiter device.
    Źródło:
    World Scientific News; 2016, 52; 57-69
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Broadband fluorescence emission and laser demonstration in large mode waveguide structure in Yb3+ doped germanate glass
    Autorzy:
    Khalid, Mamoona
    Powiązania:
    https://bibliotekanauki.pl/articles/1835769.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    germanate glass
    ultrafast waveguide writing
    near-infrared laser operation
    high linear refractive index
    nonlinear refractive index
    Opis:
    A stable composition (against crystallization) of germanate glass doped with Yb3+ for mid-infrared laser applications is presented. Broad emission spectrum of Yb3+ was obtained for the fabricated glass. Laser operation was demonstrated in 13 mm long waveguide written in the glass using a femtosecond laser operating at 524 nm center wavelength sending 250 fs ultrashort pulses. The resulting CW laser operated at 1.04 μm in the fundamental mode of the waveguide. The propagation loss through the waveguide was 0.6 dB/cm at 1550 nm for 45 μm diameter of the modified structure. The mode analysis of the developed waveguide structure is also presented in COMSOL Multiphysics to study the electric field distribution through different modes of propagation in the waveguide and the confinement loss associated to them.
    Źródło:
    Optica Applicata; 2021, 51, 1; 75-85
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance analysis of optimized non-zero dispersion shifted fiber without amplification and without dispersion compensation for wavelength division multiplexing optical networks
    Autorzy:
    Priya, R.
    Sivanantharaja, A.
    Selvendran, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/174883.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    non-zero dispersion shifted fiber (NZDSF)
    repeaterless wavelength division multiplexing (WDM) links
    dispersion
    nonlinear effects
    four wave mixing (FWM)
    refractive index profile
    bit error rate (BER)
    Opis:
    In this paper, we have analyzed the performance of our optimized non-zero dispersion shifted fiber with three different test fibers, namely, single mode fiber, conventional non-zero dispersion shifted fiber and dispersion shifted fiber. While comparing the performances of those fibers, our optimized non-zero dispersion shifted fiber has yielded a better quality factor of 5.24 at 2.5 Gbit/s for long haul fiber length of 120 km in the absence of amplification and dispersion compensation. In order to measure the nonlinear impairments of wavelength division multiplexing channel, the quality factor values are measured at the sample channel 193.1 THz for 150 km lengthed fiber with peak input power of 6 dBm. Due to a very large effective area of optimized non-zero dispersion shifted fiber, it delivers a better quality factor of 6.12 compared to the other test fibers. We have also carried out the analysis for higher bitrates and different modulation formats at the transmission end. More phase encoded modulations of carrier-suppressed return-to-zero–differentiated phase shift keying and carrier-suppressed return-to-zero–differential quadrature phase shift keying offered optimum performances for a distance of 120 km at 10 Gbit/s bitrate. By including optical amplifiers, we could achieve a record fiber transmission length of 4000 km at the bitrate of 2.5 Gbit/s which can help the future wavelength division multiplexing optical networks to a great extent.
    Źródło:
    Optica Applicata; 2015, 45, 4; 473-490
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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