采用双中心记录方案在双掺杂LiNbO3∶Fe∶Rh晶体中实现了近红外非挥发全息记录,研究了LiNbO3∶Fe∶Rh晶体在633 nm,752 nm,799 nm波长下的全息记录性能。结果表明,在使用近红外记录光时,其记录灵敏度随敏化光强的变化趋势与双中心短波长记录时的不同。通过和LiNbO3∶Fe∶Mn等传统双掺杂铌酸锂晶体的近红外波段记录效果对比,发现同时掺杂Fe和Rh可增强晶体对近红外光的吸收,获得更高的浅中心Fe光生伏特系数,从而能够在LiNbO3∶Fe∶Rh晶体中实现近红外波段的光折变全息记录。

The near-infrared nonvolatile holographic recording has been realized in a doubly doped LiNbO3∶Fe∶Rh crystal by the traditional two-center recording scheme. This crystal has been studied experimentally for holographic recording at 633, 752 and 799 nm. The experimental results show that, the sensitizing light intensity affects the recording sensitivity in a different way with two-center holographic recording by shorter wavelength laser. Compared with LiNbO3∶Fe∶Mn and other traditional doubly doped LiNbO3 crystals, the near-infrared absorption and photovoltaic coefficient of shallow trap Fe are enhanced in LiNbO3∶Fe∶Rh crystal. The LiNbO3 crystal can realize two-center near-infrared nonvolatile photorefractive holographic recording.