Temperature dependence of absorption in photorefractive iron-doped lithium niobate crystals

Abstract

We present experimental data showing a significant dependence of light absorption on temperature in photorefractive LiNbO 3 :Fe crystals. The results are successfully explained by assuming that the widths of the Fe 2ϩ absorption bands in the visible and in the infrared spectral region depend on temperature. The findings are of relevance for thermal fixing of holograms. Furthermore, a temperature-induced increase of the infrared absorption is promising for improved infrared recording.

Temperature shift of the Fe2+ absorption band in LiNbO3:Fe crystal

“…The knowledge of the temperature evolution of the absorption bands in the visible is crucial due to the fact that the nonvolatile recording becomes possible at elevated temperatures. The recent work by Panotopoulos et al [5] has been the first address to the issue of temperature dependence of absorption in LiNbO 3 :Fe crystal. They reported that the absorption Fe 2+ band broadens while the peak absorption energy does not shift as the temperature is increased up to 150 °C.…”

In situinvestigation of optical absorption changes in LiNbO3during reducing/oxidizing high-temperature treatments

“…That means that the changes that take place directly during the cooling process escape observation. We know of only two publications [23,24], where in situ investigations of optical absorption were carried out for Fe-doped LN crystals in the spectral region of absorption of the Fe ions, however in a narrow temperature range.…”

Experimental Study on LiNbO3 as Q-switched crystal in 1319nm laser

“…There are two ways of transverse and longitudinal uses for LN.In the transverse use,the total phase delay is not only proportional to the applied voltage,but also related to l/d [5].Therefore, the half wave voltage can be greatly reduced with the increase of l or decreasing d .In this paper,we take transverse voltage mode.…”