中文摘要：

生长了铁掺杂（质量分数分别为25×10^-6，50×10^-6，100×10^-6以及200×10^-6）的近化学配比铌酸锂（SLN）晶体．用中心波长为532nm的半导体激光器对晶体进行了二波耦合实验，测得了二波耦合的相应时间和有效增益系数随掺杂浓度、入射光总光强、写入光光强比以及人射光偏振方向的变化情况．实验结果表明，掺杂浓度越高，总入射光强越大，入射光光强比越小，都能导致响应时间减小，并且e光的响应时间要小于o光的响应时间；入射光光强比越大，有效增益系数越大，e光的有效增益系数要大于o光，而掺杂浓度对有效增益系数没有明显的影响．

英文摘要：

In this study, Near - stoichiometric lithium niobate （ LiNbO3 , SLN ） crystals dope with low iron are grown, in which the mass fractions are 25 ×10^-6,50×10^-6,100×10^-6, respectively. Two - beam coupling effect of Fe - SLN has been experimented on with the semiconductor laser（ wavelength is 532 nm）. We have measured the relationship between transmission light, effective gain coefficient and the concentration of iron, the intensity of inci- dent light, the rate of incident intensity, and the polarization state of incident light. The result shows that both higher concentration, higher incident intensity and smaller rate of incident in- tensity can make the response time shorter, and the response time of extraordinary light is shor- ter than that of ordinary light. Bigger rate of incident intensity can lead to bigger effective gain coefficient, and the effective gain coefficient of extraordinary light is bigger than that of ordinary light, but the concentration has little effect on the effective gain coefficient.