不同Li/Nb摩尔比In∶Fe∶LiNbO_3晶体的生长及其光学性能

GROWTH OF In∶Fe∶LiNbO_3 CRYSTALS WITH DIFFERENT n(Li)/n(Nb) RATIOS AND THEIR OPTICAL PROPERTIES

在Li NbO3(LN)中掺摩尔分数为1%的In和掺质量分数为0.03%的Fe,用提拉法技术生长具有不同n(Li)/n(Nb)[n(Li)/n(Nb)=0.94,1.05,1.20,1.38]的In∶Fe∶LN晶体。测试不同n(Li)/n(Nb)的In∶Fe∶LN晶体的吸收光谱、抗光致散射能力和指数增益系数,并计算晶体的有效载流子浓度。结果表明晶体样品随着n(Li)/n(Nb)增加,吸收光谱的吸收边发生紫移,抗光致散射能力增加,指数增益系数和有效载流子浓度增大。采用n(Li)/n(Nb)=1.38的In∶Fe∶LN晶体作记录介质,n(Li)/n(Nb)=1.05的In∶Fe∶LN晶体作位相共轭镜进行全息关联存储实验。实验表明存储系统具有实时处理,成像质量好,信噪比高和能反复使用等优点。

1% （in mole） In ： 0.03% （in mass） Fe ： LiNbO3 （LN） crystals with different n（Li）/n（Nb） mole ratios of 0.94, 1.05,1.20 and 1.38 were grown by the Czochralski method. The absorption spectra, the photo-scattering resistance ability and the exponential gain coefficients of the 1 % In ： 0.03 % Fe ： LN crystals were measured and the effective carrier densities were computed. The results show that with the increase of n（Li）/n（Nb） ratio, the absorption edges of the 1%In ： 0.03%Fe ： LN crystals shift to the shorter wavelength and the photo-scattering resistance ability, exponential gain coefficient and the effective carriers densities increase simultaneously. Using an In ： Fe ： LN crystal with an n（Li）/n（Nb） ratio of 1.38 as the recorder medium and an In ： Fe ： LN crystal with an n（Li）/n（Nb） ratio of 1.05 as the phase conjugate mirror, holographic associative storage experiments were conducted. The storage system has many advantages as follows： real-time processing, good imaging quality, high signal to noise ratio, and it can be used repeatedly.