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Modeling of Passively Synchronized Dual Wavelength Q-Switched rm Nd^{3+}:YVO_4 Lasers

100%
Abdul Ghani B., Hammadi M.
Acta Physica Polonica A
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2012
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vol. 122
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issue 1
103-108
EN
A mathematical model describing the sum frequency generation of passively synchronized Q-switched pulses simultaneously emitted from two separate Nd^{3+}:YVO_4 lasers has been demonstrated. This model describes the temporal behavior of the output pulses, and studies the impact of the pumping energy variation on the characteristics of these pulses (output power, pulse separation, pulse widths, delay time). V^{3+}:YAG and Cr^{4+}:YAG saturable absorbers and a periodically poled KTP crystal are used to achieve and improve the synchronization of the emitted 1342 nm and 1064 nm wavelengths. The synchronization process generates pulsed yellow light with 593.5 nm wavelength, and it can be realized through adjusting the pumping energy of the gain media.
2
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Characterization of the Output Pulses of a Simultaneous Q-Switched and Mode-Locked Intracavity Frequency-Doubled Diode-Pumped Pulsed Nd^{3+}-Laser

100%
Abdul Ghani B., Hammadi M.
Acta Physica Polonica A
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2012
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vol. 122
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issue 1
85-89
EN
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.
3
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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

100%
Abdul Ghani B., Hammadi M.
Acta Physica Polonica A
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2011
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vol. 119
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issue 6
792-797
EN
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.
4
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Modeling the Dynamic Emission of a Polarized Cr^{4+}:YAG Crystal Investigated by Double-Pulse Pumping Generated by a Nd-Laser

100%
Ghani B., Hammadi M.
Acta Physica Polonica A
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2009
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vol. 115
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issue 5
873-879
EN
A mathematical model describing the dynamic emission of intracavity polarized isotropic Cr^{4+}:YAG solid-state saturable absorber was developed. This model considers double pumping laser pulses to simulate the actions of Cr^{4+}:YAG as a dual Q-switched crystal (1.06 μm) and lasing medium (1.4 μm). The model describes the time evolution of interaction between the pumping laser pulse, partial polarizer and the polarized saturable absorber. The analysis of the polarization process is based on the assumption that at each moment of lasing evolution, the state of polarization represented by an eigenstate corresponds to the lowest radiation losses state. The model offers a simple mechanism for studying the kinetics of the pulsed lasers and the influence of the variations of the pumping laser power and nonlinear anisotropy parameter on the characteristics of the output laser pulses 1.06 μm and 1.4 μm. The angular rotation of the passive switch Cr^{4+}:YAG reveals that the transmission of the polarized 1.06 μm laser radiation is strongly anisotropic in the saturation regime. The suggested model estimates the transmission of pumping laser density of the polarized light 1.06 μm radiation as a function of nonlinear anisotropy parameter, temporal behavior of the relative population inversion of Nd-laser, population inversion of the different polarized levels of Cr^{4+}:YAG pulsed laser and the output laser pulse densities under impact of different values of the nonlinear anisotropy which is due to the self-induced anisotropy of its saturated absorption.
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