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Use of Bistable Centers in CdF_{2} for Holographic Recording

100%
Langer J. M., Koziarska-Glinka B., Suchocki A.
Acta Physica Polonica A
|
1997
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vol. 92
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issue 4
673-683
EN
It is shown that metastable centers in various semiconductors can be used for efficient hologram recording. This type of holographic materials has a very high dynamic range and sensitivity. Their major drawback for possible applications is low metastability temperature. This problem can be overcome by using CdF_{2}:Ga crystals, which exhibit metastability below 240 K. This material is suitable for writing thick and multiple holograms both in static and dynamic regimes.
2
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Photostriction of CdF_{2}:In Crystals

100%
Suchocki A., Raułuszkiewicz J., Langer J., Koziarska-Glinka B.
Acta Physica Polonica A
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1997
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vol. 92
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issue 5
1005-1008
EN
Lattice relaxation accompanying phototransformation of In bistable centers from the ground, deep state to the shallow state in CdF_{2} crystal has been measured with the use of scanning tunnelling microscope. It is shown that relatively small macroscopic changes of the crystal length in the order of 1.8×10^{-6} accompany the phototransformation of In ions. Lattice expansion upon the influence of population of shallow donor levels in CdF_{2} explains the observed small changes of lattice constant during the process.
3
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Light-Induced Gratings in CdMnTeSe:In Crystals

76%
Koziarska-Glinka B., Ponder M., Wojtowicz T., Miotkowski I., Langer J. M., Suchocki A.
Acta Physica Polonica A
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1997
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vol. 92
|
issue 5
883-886
EN
We show that DX-like centers in Cd_{1-x}Mn_{x}Te_{1-y}Se_{x}:In crystal can be used in writing volume holographic gratings. The scattering efficiency is higher than 10% which proves the dispersive character of the light-induced gratings. Two different metastable centers with different lattice relaxation were found in the crystal. Measurements of the power dependence of the degenerate four-wave mixing scattering efficiency testify that both of these centers have negative U properties.
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