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    Wyświetlanie 1-6 z 6
    Tytuł:
    Self-Locking and Other Modes of the Laser Oscillations
    Autorzy:
    Lis, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1930621.pdf
    Data publikacji:
    1994-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.60.FC
    Opis:
    In this paper experiments are presented on stability of laser generation at 632.8 nm for the He-Ne tube with high amplifying coefficient. The experiments show that without any outer stimulation full stability of laser generation is obtained when self-locking is settled. Self-locking requires some conditions to be fulfilled for the cavity mirrors, i.e., their transmittivities and positions. The latter are the main subject of the experiments presented here. The results of an experiment show that in self-locking π pulse is generated and forms swept absorption at 632.8 nm in the He-Ne discharge.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 3; 531-539
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Highly efficient cladding pumped dual-wavelength thulium ytterbium co-doped fiber laser
    Autorzy:
    Latiff, A.A.
    Babar, I.
    Shamsudin, H.
    Paul, M.
    Halder, A.
    Das, S.
    Bhadra, S.
    Ahmad, H.
    Harun, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1058544.pdf
    Data publikacji:
    2016-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Wd
    42.60.Fc
    42.70.-a
    Opis:
    This paper describes the all-fiber dual-wavelength thulium ytterbium co-doped fiber laser by using a newly developed octagonal shaped double-clad thulium-ytterbium co-doped fiber as gain medium in conjunction with spatial filtering effect. The thulium ytterbium co-doped fiber laser operates at wavelengths of 1990.64 nm and 1998.92 nm with a signal to noise ratio of more than 34 dB as the 980 nm multimode pump power is increased above a threshold value of 1.5 W. The slope efficiency of the dual-wavelength laser is measured to be around 26.16%, which is comparable with the conventional thulium laser pumped by 800 nm single mode pump.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 6; 1332-1335
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Side-Mode-Suppression-Ratio οf Injection-Locked Fabry-Perot Lasers
    Autorzy:
    Krstić, M.
    Gvozdić, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795639.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Px
    42.60.Fc
    42.60.Rn
    42.60.Lh
    Opis:
    The paper deals with numerical simulation and theoretical study of injection-locked Fabry-Perot semiconductor laser diodes and their transient and steady-state properties. Motivation for this research comes from the fact that Fabry-Perot semiconductor laser diodes seem to be good candidates for transmitters applied in optical network units of new generation wavelength-division-multiplexed passive optical networks. We base our model on the full scale multimode rate equation system, which comprises all supported longitudinal modes of Fabry-Perot semiconductor laser diode, providing its high reliability and broad applicability. We analyze the influence of bias current and spontaneous emission coupling factor on injection-locking characteristics of Fabry-Perot semiconductor laser diodes and find that injection power of the master laser required to maintain an acceptable side-mode-suppression-ratio strongly depends on these parameters. The emphasis of our investigation is on spontaneous emission coupling factor, since its value is often assumed rather than thoroughly calculated or measured. As we show in the paper, variations of this parameter may affect theoretical results and their comparison with experimental data.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 664-667
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radio Frequency Generator Using Four Wave Mixing in Cascaded Nonlinear Semiconductor Optical Amplifiers
    Autorzy:
    Memon, M.
    Siraj, M.
    Fathallah, H.
    Khan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398795.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.60.Da
    42.60.Fc
    42.65.Hw
    42.79.Nv
    Opis:
    For the last three decades, the phenomenon of four-wave mixing is a significant technique for generation of light at new distinct wavelength. When two distinct laser beams (pump and probe) beat together in a non-linear medium, few modes are increased in the power at same distance from the probe and pump, as a result of four-wave mixing. In this paper, cascading structure of two semiconductor optical amplifiers produces very strong four-wave mixing. This technique is exploited to devise a tunable radio frequency signal generator. The wavelength distance between pump and probe laser beams determines the radio frequency of the generated signal. Using this scheme, it can be observed from the experimental results, that there is an increase of more than 3 dB in signal to noise ratio at 7 Gbits/sec data rate of the 60 GHz generated mm-wave signal. Moreover, the radio frequency can be tuned to hundreds of GHz by varying the distance between the pump and probe signals. This scheme will readily serve as future all optical radars. It is also a key technique for short-range communication systems for military applications. The above scheme can also be monolithically integrated.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 832-834
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acousto-Optic Devices Based on Potassium Rare-Earth Tungstates Laser Crystals
    Autorzy:
    Velikovskii, D.
    Pozhar, V.
    Mazur, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1383396.pdf
    Data publikacji:
    2015-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Hj
    42.79.Jq
    42.60.Fc
    43.35.Sx
    Opis:
    We present a family of original acousto-optical devices. They are based on new acousto-optical materials $KRE(WO_4)_2$, where RE = Y, Gd, Yb, Lu. A combination of features such as radiation resistance, optical biaxiality and appreciable acousto-optical figure of merit, makes possible creation of polarization-insensitive modulator with almost 100% of diffraction efficiency. The deflector with wide angular aperture and broad range of deflection, and collinear tunable filter are also suggested.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 1; 75-77
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fast Speed Semiconductor Ring Lasers Using Optical Injection Locking
    Autorzy:
    Memon, M.
    Fathallah, H.
    Yu, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399665.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Px
    42.55.Sa
    42.60.By
    42.60.Fc
    42.65.Pc
    Opis:
    Theoretical study for frequency response and modulation bandwidth of slave semiconductor ring laser in the master-slave configuration using optical injection locking has been investigated. Equations for frequency response of optical injection locking-semiconductor ring laser to the direct modulation, amplitude modulation of master laser, respectively, are derived and simulated. Enhancement in the modulation bandwidth of >100 GHz is reported between negative to positive detuning frequency and increasing injection power ratio.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 180-182
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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