中文摘要：

研究了三种掺Yb钒酸盐晶体Yb：LuVO4，Yb：YVO4和Yb：GdVO4的激光振荡中所呈现的光学双稳态效应．以晶体所吸收的抽运功率表征的双稳区宽度△Pabs可超过1W，在双稳区高功率一侧的边界，即激光振荡的上阈值点，出现激光输出功率的不连续变化或跃变，同时发生亚毫秒时间尺度上的大幅度强度涨落．谐振腔的输出耦合透过率、晶体长度、晶体中的热效应等对双稳态效应均具有重要影响．

英文摘要：

We have studied the effect of optical bistability exhibited in the laser oscillation of Yb： LuVO4 , Yb： YVO4 , and Yb： GdVo4, the three Yb doped vanadate crystals. The bistability range can be in excess of 1 W in terms of the pump power absorbed by the crystal. At the high-power-end side of the bistability region, i.e., the upper threshold for laser oscillation, discontinuous growing in the output power takes place, along with large fluctuations in the laser intensity occurring on sub - millisecond time scale. It is＇found that the bistability effect is affected significantly by the output coupling of the resonator, the crystal thickness, and the thermal effect existing in the crystal.