对不同组份LiNbO_3∶Fe非挥发全息存储的研究

STUDIES ON NONVOLATILE HOLOGRAPHIC RECORDING FOR LiNbO_3∶Fe WITH DIFFERENT STOICHIOMETRY

以双中心模型为基础,研究了同成份和近化学比掺铁铌酸锂晶体在稳态情况下的非挥发双色二步全息存储性能.通过比较在相同记录条件下同成份(锂的摩尔浓度为48.5%)与近化学比(锂的摩尔浓度为49.5%)掺铁铌酸锂的总空间电荷场的大小可以看到,在连续光所能达到的光强范围内,近化学比LiNbO3:Fe的总空间电荷场明显大于同成份LiNbO3:Fe的总空间电荷场.但是在高光强下,同成份与近化学比LiNbO3:Fe都可以达到106V/m量级的光致空间电荷场.

The steady-state nonvolatile two-step, two-color holographic recording performance for both the congruent and the near-stoichiometric LiNbO3 ：Fe was studied theoretically based on the two-center model. It is shown that the nonvolatile two-step, two-color holography performance in the near-stoichiometric LiNbO3 ： Fe is much better than that in the congruent LiNbO3 ：Fe within the intensity range reachable by the continuous-wave lights. In addition, it is shown that a light-induced space charge field of the order of 106 V/m is achievable in both the near-stoichiometric and the congruent LiNbO3 ： Fe with high intensities.