基于双光束耦合的原理及实验结果，计算了纯ＬｉＮｂＯ３和Ｆｅ：ＬｉＮｂＯ３晶体中的有效载流子密度，对结果进行了讨论，指出光折变ＬｉＮｂＯ３中氧空位色心也是载流子施主之一，且被激发的Ｆｅ２＋仅占晶体中Ｆｅ２＋浓度的一小部分。 Based on the principle of dual-beam coupling and experimental results, the effective carrier density in pure LiNbO3 and Fe: LiNbO3 crystals is calculated and the results are discussed. It is pointed out that the oxygen vacancy chromophore in photorefractive LiNbO3 is also one of the charge carriers , And the excited Fe2 + accounts for only a small part of the Fe2 + concentration in the crystal.