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Holographic Recording with the Use of Bistable Centers in CdF_{2}

100%

Koziarska B., Langer J. M., Ryskin A. I., Shcheulin A. S., Suchocki A.

Acta Physica Polonica A

1995

vol. 88

issue 5

1010-1012

We show that bistability and metastability of In and Ga impurities in CdF_{2} crystals can be efficiently used in writing volume holographic gratings. Phototransformation of these impurities from the localized to the hydrogenic state leads to a large change of the local polarizability of the host, and thus a significant change of the refractive index. While CdF2:In can be used only at low temperatures (below 150 K), CdF2:Ga crystals are suitable for room temperature recording.

Exciton Dynamics in CdTe/CdMnTe Multiquantum Well Structures Grown by Molecular Beam. Epitaxy on GaAs Substrate

73%

Godlewski M., Koziarska B., Suchocki A., Karczewski G., Wojtowicz T., Kossut J., Bergman J. P., Monemar B.

Acta Physica Polonica A

1995

vol. 88

issue 5

985-989

The results of picosecond photoluminescence kinetics of four different CdTe/CdMnTe multiquantum well structures grown by MBE on GaAs substrates are presented. The experimental results show that excitons in CdTe quantum wells are strongly localized by potential fluctuations. Photoluminescence decay times of the localized excitons are considerably shorter (about 120 ps) than those reported for free or quasi-free excitons. An influence of Mn in the barriers on exciton properties is demonstrated. For narrow quantum wells as well as for the multiquantum well structure with the highest Mn mole fraction the excitons migrate during their decay to the states with a lower potential energy. Longer decay times are observed for quasi-localized excitons. We show also that for strongly localized excitons the energy transfer between localized and donor bound excitons is less efficient.

Transmission Second Harmonic Generation in Cd_{1-x}Mn_{x}Te at 1.064 µm

73%

Koziarska B., Kowalczyk L., Suchocki A., Wojtowicz T., Zakrzewski A., Karczewski G., Janik E., Kossut J.

Acta Physica Polonica A

1995

vol. 87

issue 2

423-426

Second harmonic generation, created by nanosecond Nd : YAG laser pulses at 1.064 µm with relatively low intensity in Cd_{1-x}Mn_{x}Te bulk crystals and thin layers was measured in transmission geometry. The effect practically occurs in a very thin surface layer of the material and it is used as a relatively straightforward method of layer quality characterization. It is shown that the angular dependence of the second harmonic generation intensity in thin layers of CdTe with good crystallographic (and optical) quality agrees very well with the theory in contrary to the samples with some distortions from the ideal structure which exhibits large distortions from the theory.

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3 Acta Physica Polonica A

3 1995

3 Koziarska B.

3 Suchocki A.

2 Karczewski G.

2 Kossut J.

2 Wojtowicz T.

1 Bergman J. P.

1 Godlewski M.

1 Janik E.

1 Kowalczyk L.

1 Langer J. M.

1 Monemar B.

1 Ryskin A. I.

1 Shcheulin A. S.

1 Zakrzewski A.

Search results

Holographic Recording with the Use of Bistable Centers in CdF_{2}

Exciton Dynamics in CdTe/CdMnTe Multiquantum Well Structures Grown by Molecular Beam. Epitaxy on GaAs Substrate

Transmission Second Harmonic Generation in Cd_{1-x}Mn_{x}Te at 1.064 µm