Relaxation of Polarization Gratings in Organic and Inorganic Films
Abstracts of the 28th Scientific Conference 2012
Andris Ozols, Valdis Kokars, Pēteris Augustovs, Kristers Ķēniņš, Kaspars Traskovskis, Elmārs Zariņš

Dark relaxation during a month of holographic gratings (HG) recorded with differently polarized laser beams ( with linear s-s, p-p, s-p polarizations and with orthogonal C-1 and C-2 polarizations) in an inorganic a-As2S3 film and in an organic W-50 film at room temperature has been experimentally studied. HG periods were 2 m, recording wavelength was 532 nm, readout wavelength was 633 nm. Recording light intensity was 1.76 W/cm2. Self-diffraction efficiency (SDE) was measured during the recording and diffraction efficiency (DE) was mesured during the relaxation studies. The maximal SDE and DE values of 3.0% and 17.3% have been achieved with C-1 and p-p polarizations, respectively, in the a-As2S3 film. The maximal SDE and DE values in the W-50 film were 19% and 16.7% achieved with C-2 polarization. Dark relaxation kinetic was similiar in both materials. Asymmetric oscillations around the average DE level were observed. This average level was close to the initial DE in the case of W-50 film, and it was slightly growing in the case of a-As2S3 film.The root mean square value of oscillations (RMSVO) in both materials strongly depended on recording polarizations. They were growing in the following order: C-1, p-p, C-2. The maximum RMSVO took place in the case of s-s and s-p polarizations for a-As2S3 and W-50 films, respectively. Possible explanations of the observations will be given in the talk.


Keywords
Polarization holographic gratings, relaxation, organic films, inorganic films
Hyperlink
http://www.cfi.lu.lv/fileadmin/user_upload/lu_portal/projekti/cfi/CFI_konferences/abstracts_2012.pdf#page=35

Ozols, A., Kokars, V., Augustovs, P., Ķēniņš, K., Traskovskis, K., Zariņš, E. Relaxation of Polarization Gratings in Organic and Inorganic Films. In: Abstracts of the 28th Scientific Conference, Latvia, Rīga, 8-10 February, 2012. Rīga: LU Cietvielu fizikas institūts, 2012, pp.35-35.

Publication language
Latvian (lv)
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