锌离子注入铌酸锂晶体的光谱特性

利用离子注入技术和氧气氛围高温退火制备了不同掺锌剂量的铌酸锂样品,并研究了锌离子浓度以及退火状态对铌酸锂晶体紫外和红外波段特性的影响。紫外波段,锌离子的注入使铌酸锂晶体的吸收边红移,退火后吸收边均与纯铌酸锂晶体的相同,锌离子的注入降低了铌酸锂晶体的透射率;红外波段,纯铌酸锂晶体分别在3486 cm-1、2851 cm-1和2917 cm-1处出现主次吸收峰,掺锌样品的主吸收峰位置与纯铌酸锂晶体相比发生微小的红移,X切向铌酸锂样品有明显的次吸收峰,而退火前Z切向铌酸锂样品的次吸收峰不明显,退火后吸收峰变锐利。锌离子的注入以及退火状态对铌酸锂晶体的透射率有影响,分别增强和减弱X切向和Z切向铌酸锂晶体的透射率。

Spectral properties of Zn ion implantation in LiNbO3 crystal

The ion implantation and annealing at high temperature in oxygen atmosphere was used to prepare LiNbO3 samples with different Zn2+ implantation concentrations. The effects of different Zn2+ implantation concentrations and annealing state on the ultraviolet and infrared properties of LiNbO3 crystal were studied. In ultraviolet wave band,experiment results show that Zn2+ implantation makes LiNbO3 absorption band edge shift to longer wavelength,and annealed samples have the same absorption band edge with pure LiNbO3 crystal. Zn2+ implantation reduces transmittance of LiNbO3 crystal. In infrared wave band,the pure LiNbO3 crystal appears the primary and secondary peaks in 3486cm-1,2851cm-1,2917cm-1,respectively. And compared with pure LiNbO3 crystal,the positions of the primary absorption peaks for Zn implantation samples occur slightly red shift. The secondary absorption peaks for X-cut LiNbO3 crystal are obvious. The secondary absorption peaks for Z-cut LiNbO3 crystal are not obvious before annealing,but become sharp after high temperature annealing. Zn2+ implantation enhances the transmittance of X-cut LiNbO3 crystal,but reduces the transmittance of Z-cut LiNbO3 crystal.