Study of Temperature Enhancement of the Photorefractive Effect in Ce：Fe：LiNbO_3 Crystal

in the range of 20 to 120 ℃, the two-beam coupling exponential gain coefficient and the four-wave mixing phase conjugation reflectivity have been investigated. It is shown that the values such as the gain, the phase conjugation reflectivity and the response speed increase as the temperature increases. At about 55, 71 and 110℃, extraordinary enhancement of the gain and the phase conjugation reflectivity were observed.The mechanism is analyzed by the phase change in the crystal at these temperatures.

掺钐LiNbO_3∶Fe晶体光折变性能研究

在Ｆｅ∶ＬｉＮｂＯ＿３晶体中掺入Ｓｍ＿２Ｏ＿３，生长出Ｓｍ、Ｆｅ双掺杂晶体Ｓｍ∶Ｆｅ∶ＬｉＮｂＯ＿３，在Ｈｅ－Ｎｅ激光下，分别用二波和四波混频方法测试了Ｓｍ∶Ｆｅ∶ＬｉＮｂＯ＿３的指数增益系数，衍射效率和相位共轭反射率及其响应时间。与Ｆｅ∶ＬｉＮｂＯ＿３相比，Ｓｍ∶Ｆｅ∶ＬｉＮｂＯ＿３的响应时间大大缩短。