Material parameters relevant to the photorefractive effect in the paraelectric phase are compared for KLTN doped with iron and KLTN doped with copper. Unlike copper-doped crystals, iron-doped KLTN shows an efficient thermal fixing process occurring at room temperature. Measurements as a function of temperature and applied field reveal the compensation to be a thermally activated process with an activation energy of 1.05 eV, but the process is only weakly dependent on field. FTIR measurements indicate the presence of hydrogen and conductivity measurements suggest that hydrogen migration is the dominant contribution to the conductivity, reinforcing the conclusion that the crystals show "thermal fixing" at room temperature.
|Original language||American English|
|Title of host publication||Photorefractive Effects, Materials, and Devices, PR 2001|
|Publisher||Optica Publishing Group (formerly OSA)|
|Number of pages||6|
|State||Published - 2001|
|Event||Photorefractive Effects, Materials, and Devices, PR 2001 - Delavan, United States|
Duration: 8 Jul 2001 → …
|Name||Optics InfoBase Conference Papers|
|Conference||Photorefractive Effects, Materials, and Devices, PR 2001|
|Period||8/07/01 → …|
Bibliographical noteFunding Information:
This research was supported in part by a grant from the Ministry of Science, Israel, and the Israel Academy of Science.
© 2001 Optical Society of America.