报道了我们在85Rb热原子系统中利用远离共振的Raman动力学过程实现相干光信号存储与释放的实验研究。铷原子室采用μ-metal包裹消除环境磁场的影响,在双光子共振和单光子远失谐的条件下,我们测量了存储效率随存储时间及单光子失谐量的变化关系,得到的最高存储效率为 23.5％,寿命约为3.4 μs。

We review the dark decay of the electronic holographic phase grating before thermal fixing, and deduce the general analytic expression of the lifetime of thermal-fixed ionic holograms in the photorefractive crystal, by means of analogizing. Because the ions are optically inactive, the lifetime of thermal-fixed ionic holograms is only closely relate to the ionic decay rate which is determined by the conductivity of ionic species at a given temperature. We theoretically analyze and numerically simulate the influences on the lifetime of ionic grating from the crucial factors in the experiment and application. The results reveal that low temperature, low ion-concentration, and large grating spacing are advantages for extending the life of the thermal-fixed volume holographic phase grating in photorefractive crystal.

采用红光对单、双掺铌酸锂晶体中全息光栅的热固定效率及光擦除和暗存储寿命的特性进行了深入的实验研究。实验中高掺杂和强还原晶体难以显影出离子光栅；对于较少掺杂的未还原晶体,获得离子光栅的热固定效率达50%；高掺杂晶体中离子光栅的暗存储寿命达4个月,比热固定前电子光栅的暗存储寿命提高了十几倍。实验表明热固定效率和光栅的暗存储寿命不能同时提高,这与理论预期一致。