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187 results on '"Mierczyk Z"'

70. Wavelength tuning in Er3+,Yb3+:glass microchip lasers.

Author

Młyńczak, J., Kopczyński, K., and Mierczyk, Z.

Abstract

The paper presents the investigation results of laser generation around 1.5 μm at different wavelengths. The shifts of the wavelength were achieved by the change of pump power, transmission of an output mirror, and length of an active medium. Mathematical analysis and explanation of this phenomenon was curried out on the basis of the change in relation between the gain and loss lines. [ABSTRACT FROM AUTHOR]

Published
2009
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71. Optimization of Passively Repetitively Q-Switched Three-Level Lasers.

Author

Mlynczak, J., Kopczynski, K., and Mierczyk, Z.

Subjects
LASERS, STRUCTURAL optimization, INTEGRATED circuits, RADIATION, OPTOELECTRONIC devices, LASER beams, OPTICAL reflection, REFLECTANCE
Abstract

A generalized model of a passively repetitively Q-switched three-level laser is presented. The method for evaluation of the small-signal gain coefficient and the dissipative losses of a three-level laser is shown. To demonstrate the use of this optimization procedure, it was applied to a microchip laser generating 1.5-μm radiation. The model may be expanded for a four-level laser by replacing the calculation of the small-signal gain coefficient. [ABSTRACT FROM AUTHOR]

Published
2008
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72. Pb.

Author

Zmija, J., Kaddouri, H., Majchrowski, A., Mierczyk, Z., and Kityk, I.V.

Published
2001
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74. Pb4.7Ba0.3Ge3O11Crystals as New Acoustically Induced Nonlinear Optical Materials

Author

Zmija, J., Kaddouri, H., Majchrowski, A., Mierczyk, Z., and Kityk, I.V.

Abstract

A coustically induced optical second harmonic generation (SHG) and two‐photon absorption (TPA) in ferroelectric Pb4.7Ba0.3Ge3O11crystals have been found. We have found that with increasing acoustical power, the SHG for YAG:Nd laser light (λ=1.06 μm) increases and achieves its maximum value at acoustical power density about 1.75 W/cm2. The evaluated SHG values were 23 % less comparing with χ222tensor of the KDP single crystals. With decreasing temperature, the acoustically induced SHG signals trongly increases below 29 K. The maximal acoustically induced SHG has been observed at acoustical frequencies lying with in the ranges 12‐17 kHz, 22‐23 kHz and above 26 kHz. This behavior reflects nonlinear superposition of the nonlinear optical susceptibilities stimulated by externallyinduced electron‐phonon anharm onicity. We have observed substantial increase of the TPA (for the acoustical power W=1.8 W/cm2) at high hydrostatic pressures (about 16 GPa) and low temperatures (below 16 K). This one confirms complicated influence of the electron‐phonon interactions in the ferroelectricson the observed nonline aroptical dependences.

Published
2001
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77. Investigation of Nonlinear Absorption of LaGaO3:Co Crystals near 1.5 μm

Author

Gołąb, S., Mierczyk, Z., and Ryba-Romanowski, W.

Abstract

Nonlinear absorption near 1.5 μm of cobalt doped LaGaO3 crystals has been investigated. The observed dependence of transmission coefficient on incident energy density reveals a contribution of an excited state absorption. The assignment of ESA has been proposed tentatively, because a strong absorption of Co3+ prevents the location of excited levels of Co2+ which may be involved. It has been concluded that LaGaO3:Co crystal is a good candiate as a passive Q-switch for erbium lasers operating near 1.5 μm.

Published
2000
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79. Spectroscopic and crystallographic studies of YAG:Pr4+single crystals

Author

Pawlak, D., Frukacz, Z., Mierczyk, Z., Suchocki, A., and Zachara, J.

Abstract

Y3Al5O12single crystals doped with praseodymium and magnesium ions have been prepared. The reversible color change of these crystals are observed when annealing in oxidizing or reducing atmospheres. The change is ascribed to the formation of Pr4+in the as-grown crystal, caused by the second dopant, Mg2+. The absorption spectra of YAG:Pr,Mg in the range 200–1100nm, as grown and annealed in air and H2/N2atmosphere, are presented and discussed. Additional broad absorption bands are observed for the as-grown crystals and those annealed in oxidizing atmosphere. Crystallographic investigations of the original crystal and after annealing in a reducing atmosphere as described above, show no distinct structural differences. A redox mechanism is proposed to explain the color change during annealing.

Published
1998
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