<title>Temperature dependent measurements on a low-molecular-weight photorefractive glass</title>

The erasing dynamics of holographic gratings in a low molecular weight photorefractive glass depending on the sample temperature were investigated. Changes in the overall speed of the material by three orders of magnitude over a temperature range of 13 K were observed. We identified two distinct processes below the glass transition temperature T<SUB>g</SUB>, a fast one on time scales of seconds and a slower one with lifetimes around 10<SUP>3</SUP> s. We attribute the fast process to the electro-optic effect and the slower one to orientational diffusion processes of the glass molecules. Above T<SUB>g</SUB>, the fast process vanishes, whereas the diffusional processes accelerate up to time constants in the range of seconds. This study shows, that an accurate temperature control is indispensable when measuring photorefractive dynamics, especially in the temperature range around T<SUB>g</SUB>.