Intensity dependence of two-center nonvolatile holographic recording in LiNbO3 : Cu : Ce crystals

Nonvolatile photorefractive gratings have been recorded in LiNbO3:Cu:Ce cry stals by using a He-Ne laser (633 nm) for recording and an argon ion laser (458 nm) for sensitizing. The sensitizing light increases the recording sen sitivity by a - b exp(-I-s/c) and saturation behavior will appear with high enough intensity of sensitizing light. The recording light increases the s lope of eta (1/2) as a function of time during the initial stages of hologr am formation by sublinear I-r(x) (x < 1) and thus the recording light decre ases the recording sensitivity. The dependence of saturation diffraction ef ficiency on the intensities of the recording and sensitizing light shows th at there is a maximum dynamic range of the recording process. <(c)> 2001 Pu blished by Elsevier Science B.V.