掺铁铌酸锂晶体中光致散射的锂组分和温度依赖关系研究

研究了单掺铁铌酸锂晶体的光致散射行为随锂组分以及温度的变化关系.实验表明,随晶体组分的升高,光致散射得到了大幅抑制;不同组分晶体光致散射被完全抑制的温度不同.由此提出掺铁铌酸锂晶体在48.9 mol%-49.3 mol%范围内可能存在一临界锂组分,当晶体组分超过这一临界组分时,晶体光致散射被大幅抑制,而光致散射行为的温度依赖关系明显改变.     

Study on UV-light-induced absorption in LiNbO3:Fe, Co crystal

##正##In this paper,the temporary UV-light-induced absorption in LiNbO_3:Fe,Co crystal is investigated for different UV intensities.It is found that the sensitizing process in LiNbO_3:Fe,Co can be considered as a combination of two sub-processes with different time constants.Based on the lattice structure and the photochromic mechanism of the material,the two sub-processes are suggested to arise from electron transfer from O~(2-) to Fe~(3+) through two paths with different distances.The two-colour recording experiment in LiNbO_3:Fe,Co is also preformed by using UV and green light as gating and writing beams respectively.High sensitivity is obtained in the recording,which is considered as the consequence of direct charge transfer from O~(2-) to Fe~(3+).