摘要
采用气相输运平衡技术 ,对不同掺镁浓度的铌酸锂进行了近化学计量处理 ,并检验了其抗光折变性能。实验结果表明 ,掺摩尔分数为 2 %的镁的近化学计量铌酸锂晶体 ,光折变阈值比同成分晶体提高了 4个量级。通过施加 4 .5kV/mm的脉冲电场 ,在上述 1.0mm厚z切晶体上制备出了周期为 6 .8μm的均匀畴结构。采用声光调QNd∶YAG激光器作抽运光源 ,基频光波波长为 1.0 6 4 μm ,平均输入功率为 2 30mW ,在室温条件下 ,得到波长为0 .5 32 μm,输出功率为 2 .8mW的倍频绿光输出 ,倍频转换效率为 1.2 2 %。
LiNbO 3 crystal with different MgO doped concentration were processed by vapor transport equilibration.The processed crystals doped 2%(mole fraction) MgO increased the photoreactive damage resistance by at least 4 orders of magnitude compared with congruent crystal.By applying an external electric field of 4.5kV/mm,we obtained a periodically poled domain structure with a 6.8μm period and 1.0mm thickness in the doped MgO 2%(mole fraction) near-stoichioment LiNbO 3 crystal.A Q-switched Nd∶YAG laser was used as the fundamental beam source at 1.064μm.When input power was 230mW,the green SHG at 0.532μm was obtained with 1.22% conversion efficiency.
出处
《激光技术》
CAS
CSCD
北大核心
2004年第2期141-143,共3页
Laser Technology
基金
国家自然科学基金资助项目 (90 10 10 2 2 )
关键词
倍频
准相位匹配
近化学计量
掺镁铌酸锂晶体
周期极化
second harmonic generation
quasi phase matched
near-stoichiometric
MgO-doped LiNbO 3
periodical poling
