Temat: 42.55.Px - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Comparison of Long-Time Delay in Lasing in Homo- and Heteroepitaxially Grown II-VI Laser Diodes
Autorzy:: Isemann, A.
Behringer, M.
Wenisch, H.
Fehrer, M.
Ohkawa, K.
Hommel, D.
Tematy:: 42.55.Px; Pokaż więcej
Data publikacji:: 1998-08
Powiązania:: https://bibliotekanauki.pl/articles/1969096.pdf Link otwiera się w nowym oknie
Źródło:: Acta Physica Polonica A; 1998, 94, 2; 355-358
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Opis:: Gain guided laser diodes exhibit unexpected low threshold current densities. Under these conditions, lasing only occurs under a current dependent long-time delay, which is three orders of magnitude larger than the time needed to reach population inversion. This effect is attributed to a thermally induced index guiding. The change in temperature of the quantum well region can be estimated using the shift in the wavelength of emission to be up to 70 K. As a further consequence, the threshold current density can be reduced by a factor of 4 simply by changing the pulse width of the applied current.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 2.

Tytuł:: Far-Infrared Few-Cycle-Pulse Generation in Quantum-Well Heterostructures under Femtosecond Laser Pumping
Autorzy:: Belyanin, A. A.
Kocharovsky, V. V.
Kocharovsky, Vl. V.
Pestov, D. S.
Scully, M. O.
Tematy:: 42.55.Px
42.60.-v; Pokaż więcej
Data publikacji:: 2005-01
Powiązania:: https://bibliotekanauki.pl/articles/2041669.pdf Link otwiera się w nowym oknie
Źródło:: Acta Physica Polonica A; 2005, 107, 1; 151-157
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Opis:: It is shown that the resonant nonlinear-wave mixing in the semiconductor quantum wells under a femtosecond optical pulse excitation can be used for the generation of the utmost short mid/far-infrared pulses with a few- or even single-cycle duration defined by pump duration.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Pressure and Temperature Dependence of Threshold Current in Semiconductor Lasers Based on InGaAs/GaAs Quantum-Well Systems
Autorzy:: Maziarz, M.
Piechal, B.
Bercha, A.
Bohdan, R.
Trzeciakowski, W.
Majewski, J. A.
Tematy:: 42.55.Px
85.60.Jb; Pokaż więcej
Data publikacji:: 2007-08
Powiązania:: https://bibliotekanauki.pl/articles/2047719.pdf Link otwiera się w nowym oknie
Źródło:: Acta Physica Polonica A; 2007, 112, 2; 437-442
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Opis:: In the present paper we demonstrate that wide-range wavelength tuning of semiconductor lasers can be achieved by applying high pressure and low temperature. We report the experimentally measured dependence of the threshold current and emission energy on pressure and temperature in InGaAs/GaAs quantum-well lasers and provide the simple theoretical explanation of the physics behind the experimental findings.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Theoretical Analysis of Optical Gain in Quantum Well Lasers Including Valence-Band Mixing Effect
Autorzy:: Łepkowski, S.
Bugajski, M.
Tematy:: 73.20.Dx
42.55.Px; Pokaż więcej
Data publikacji:: 1997-11
Powiązania:: https://bibliotekanauki.pl/articles/1968351.pdf Link otwiera się w nowym oknie
Źródło:: Acta Physica Polonica A; 1997, 92, 5; 903-907
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Opis:: The linear optical gain in the AlGaAs/GaAs quantum well lasers is studied theoretically, taking into account the valence-band mixing effect. Our approach is based on the multiband effective-mass theory (k p method) and the density-matrix formalism. In order to obtain the valence bands' structure we employ the 4×4 Luttinger-Kohn Hamiltonian, neglecting the coupling to the split-off band. The spectral dependence of the linear optical gain is calculated using the density-matrix method with interband relaxation. Finally, we analyse the spatial distribution of the optical gain in the quantum well region for the photon energy corresponding to the peak value of the linear gain.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Fermi-Edge Singularity in Luminescence Spectra of P-Type Modulation Doped AlGaAs/GaAs Quantum Wells
Autorzy:: Bugajski, M.
Godlewski, M.
Regiński, K.
Holtz, P. O.
Bergman, J. P.
Monemar, B.
Tematy:: 42.55.Px
73.20.Dx; Pokaż więcej
Data publikacji:: 1998-08
Powiązania:: https://bibliotekanauki.pl/articles/1969046.pdf Link otwiera się w nowym oknie
Źródło:: Acta Physica Polonica A; 1998, 94, 2; 265-270
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Opis:: We have studied an enhancement of the oscillator strength for optical transitions near the Fermi energy in p-type modulation-doped quantum wells, which, so far, deserved much less attention than analogous n-type systems, because of the complicated valence band structure involved. The relatively wide (L=150 Å) quantum wells and high doping levels were used, containing more than one occupied subband. The enhancement in the photoluminescence intensity at the Fermi energy resulted from the strong correlation and multiple scattering of holes near the Fermi edge by the localized electrons.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 6.

Tytuł:: Analyzing the Intracavity Frequency Doubling of the Simultaneous Q-Switched Mode-Locked Diode-Pumped Pulsed $Nd^{3+}$ Laser with $Cr^{4+}$:YAG as a Polarized Saturable Absorber
Autorzy:: Abdul Ghani, B.
Hammadi, M.
Tematy:: 42.55.Px
42.55.Rz
42.68.Mj; Pokaż więcej
Data publikacji:: 2011-06
Powiązania:: https://bibliotekanauki.pl/articles/1504608.pdf Link otwiera się w nowym oknie
Źródło:: Acta Physica Polonica A; 2011, 119, 6; 792-797
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Opis:: The intracavity frequency doubling of a simultaneous passively Q-switched mode-locked diode-pumped $Nd^{3+}$ laser is studied with a polarized isotropic $Cr^{4+}$:YAG saturable absorber. A general recurrence formula for the mode-locked pulses under the Q-switched envelope at a fundamental wavelength has been reconstructed in order to analyze the temporal shape behaviour of a single Q-switched envelope with mode-locking pulse trains. This formula has been derived taking into account the impact of the intracavity frequency doubling and polarized $Cr^{4+}:YAG$ saturable absorber (the Fresnel losses). The presented mathematical model essentially describes the self-induced anisotropy appearing in the polarized $Cr^{4+}:YAG$ in the nonlinear stage of the giant pulse formation. For the anisotropic $Nd^{3+}:YVO_4$ active medium, the generated polarized waves are fixed through the lasing cycle. Second harmonic peak power, pulse width, pulse duration, shift pulse position of central mode and rotational angle as a function of the absorber initial transmission are estimated. The calculated numerical results are in good qualitative and quantitative agreement with the available experimental data reported in references.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 7.

Tytuł:: Characterization of the Output Pulses of a Simultaneous Q-Switched and Mode-Locked Intracavity Frequency-Doubled Diode-Pumped Pulsed $Nd^{3+}$-Laser
Autorzy:: Abdul Ghani, B.
Hammadi, M.
Tematy:: 42.55.Px
42.55.Rz
42.68.Mj; Pokaż więcej
Data publikacji:: 2012-07
Powiązania:: https://bibliotekanauki.pl/articles/1419732.pdf Link otwiera się w nowym oknie
Źródło:: Acta Physica Polonica A; 2012, 122, 1; 85-89
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Opis:: A mathematical model for describing the polarization effect of the intracavity frequency-doubling of a simultaneous passively Q-switched and mode-locked diode-pumped $Nd^{3+}$-laser has been demonstrated. The generated polarized waves are assumed to be fixed through the lasing cycle. The maximum absorber initial transmission and the minimum mirror reflectivity values have been determined from the second threshold criterion. The calculated numerical results demonstrate the impact of the variation of the input laser parameters on the characteristics of the output laser pulses. The calculated results are in good agreement with the available experimental data reported in references.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 8.

Tytuł:: Dynamics of the Intraband Light Absorption in Selectively Doped GaAs/AlGaAs Quantum Wells
Autorzy:: Vorobjev, L.
Panevin, V.
Fedosov, N.
Firsov, D.
Shalygin, V.
Seilmeier, A.
Schmidt, S.
Zibik, E.
Towe, E.
Kapaev, V.
Tematy:: 42.55.Px
42.60.-v; Pokaż więcej
Data publikacji:: 2005-02
Powiązania:: https://bibliotekanauki.pl/articles/1178288.pdf Link otwiera się w nowym oknie
Źródło:: Acta Physica Polonica A; 2005, 107, 2; 429-434
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Opis:: Spectral and temperature dependences of equilibrium and non-equi-intersubband light absorption in the mid-infrared spectral range were studied in selectively doped asymmetrical tunnel-coupled GaAs/AlGaAs quantum wells. The temporal evolution of the absorption studied by means of a picosecond pump-probe technique was found to have a biexponential character. The fast decay times are determined by intersubband electron relaxation due to electron scattering by optical phonons and impurities. The presence of long decay times in transient mid-infrared absorption is probably connected with electron transitions from the states in barrier (X and L valleys as well as deep centers) to the states of the quantum well. Experimentally determined intersubband scattering times are compared with the calculated ones.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 9.

Tytuł:: Mode-Locked Dual-Wavelength Heterolasers for Terahertz Generation via Intracavity Wave Mixing
Autorzy:: Belyanin, A.
Kocharovsky, V.
Kocharovsky, Vl.
Kukushkin, V.
Andrianov, A.
Aleshkin, V.
Dubinov, A.
Tematy:: 42.55.Px
42.65.Ky; Pokaż więcej
Data publikacji:: 2008-03
Powiązania:: https://bibliotekanauki.pl/articles/1813202.pdf Link otwiera się w nowym oknie
Źródło:: Acta Physica Polonica A; 2008, 113, 3; 869-873
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Opis:: It is shown that the mid/far-infrared (IR) and THz pulse generation via intracavity difference-frequency mixing in quantum-well dual-wavelength heterolasers can be rather efficient under mode-locking regime for one or both lasing fields even at room temperature. In a simple model we derive an explicit formula for intensity of the generated IR or THz pulse and find that this method is capable of producing picosecond pulses at ≈1 GHz repetition rate with the peak power of the order of 1 W and ≤ 0.2 mW at 10 μm and 50 μm wavelengths, respectively.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Parametric Generation of Middle and Far Infrared Radiation in GaAs-Based Semiconductor Lasers and Waveguides
Autorzy:: Aleshkin, V. Ya.
Afonenko, A. A.
Biryukov, A.
Gavrilenko, V. I.
Dubinov, A. A.
Kocharovsky, Vl. V.
Morozov, S. V.
Maremynin, K. V.
Nekorkin, S. M.
Zvonkov, B. N.
Zvonkov, N. B.
Tematy:: 42.55.Px
42.65.-k; Pokaż więcej
Data publikacji:: 2005-01
Powiązania:: https://bibliotekanauki.pl/articles/2041620.pdf Link otwiera się w nowym oknie
Źródło:: Acta Physica Polonica A; 2005, 107, 1; 7-13
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Opis:: A possibility of parametric generation of middle and far infrared radiation due to the lattice nonlinearity in semiconductor laser diode and waveguide is discussed. Three possible waveguide constructions for effective generation are considered. The parametric generation method is shown to provide generation power of the order of milliwatt for middle infrared radiation and of tens of microwatt for far infrared radiation using modern quantum well laser diodes.
Dostawca treści:: Biblioteka Nauki

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