Two-photon holographic recording in LiTaO3:Fe crystals with high intensity nanosecond pulses at 532 nm

Recording the volume holograms in LiTaO3 with high intensity (up to 11 GW/cm(2)) nanosecond pulses was considered in this study. A very compact Nd:YVO4 laser with the pulse duration of 1.7 ns at lambda = 530 nm was used for the recording. Four congruent LiTaO3 samples with the iron contents ranging from 3.3 x 10(17) to 700 x 10(17) cm(-3) were selected for the experimental observation. In the LiTaO3:Fe crystal (C-Fe = 66 x 10(17) cM(-3)), the microhologram recording by the single nanosecond pulse with as high refractive index change as 7.6 x 10(-4) was carried out. In the same sample, the maximum refractive index change of 29.8 x 10(-4) was reached under the exposition to a train of four pulses. The qualitative charge transport model taking into account a recording with high intensity nanosecond pulses was proposed.