Dynamic properties of multiple grating formation in doped and thermally treated lead germanate |
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| Authors: | S Mendricks X Yue R Pankrath H Hesse D Kip |
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| Institution: | Fachbereich Physik, Universit?t Osnabrück, D-49069 Osnabrück, Germany (Fax: +49-541/969-2670, E-mail: smendric@physik.uni-osnabrueck.de), DE
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| Abstract: | During holographic recording in lead germanate (Pb5Ge3O11) crystals two types of refractive-index gratings are observed. One has a very fast response whereas the second builds up
comparably slowly. Measurements of diffraction efficiency and two-beam coupling are carried out to study the formation of
both gratings and to obtain the relative phase between them. Differently doped and thermally treated samples are divided into
four classes due to their different time evolution of diffraction efficiency and of the energy transfer direction during two-beam
coupling. The classification depends on doping and treatment. For Ni-doped and thermally treated samples dark and photo conductivities
corresponding to the slow grating are determined, indicating that Ni-doping combined with oxidation enhances the properties
of the slow grating.
Received: 18 November 1998 / Published online: 7 April 1999 |
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| Keywords: | PACS: 42 70 Nq 42 65 Hw |
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