摘要
基于单轴晶体中三波互作用的共线相位匹配技术,采用CO2激光器泵浦非线性晶体AgGaSe2,数值计算出在oee类和oeo类相位匹配条件下,差频产生太赫兹波的相位匹配角、走离角、允许角和有效非线性系数。计算结果表明:两类相位匹配太赫兹波可调谐的范围都非常宽,而且走离角都在1°以下,允许角足够大。在绝大部分太赫兹波区域,oee类匹配有效非线性系数远大于oeo类匹配,实验中适合采用oee类相位匹配方式。
Based on the technology of the collinear phase-matching about three-wave interactions in uniaxial crystal,the phase-match angle,walk-off angle,acceptance angle and effective nonlinear coefficient of the terahertz wave based on difference-frequency generation are calculated under oeo type and oee type phase-matching conditions in AgGaSe2 crystal pumped by CO2 laser.The results show that terahertz wave tunable range is very wide with two types of phase-matching conditions,and the walk-off angles are less than 1°,the acceptance angles are large enough.In the vast majority of terahertz wave region,effective nonlinear coefficient of oee type is much larger than that of oeo type,thus oee type is more suitable to be used in experiments.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2010年第11期2653-2657,共5页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(60637010)
山东科技大学春蕾计划项目(2008AZZ097)
