Dispersion of second-order nonlinear optical coefficient
Dispersion of second-order nonlinear optical coefficient
复制标题
二阶非线性光学系数色散
DOI：
10.1007/s003400100651
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
J. Seres
中科院分区：
文献类型：
--
作者：
J. Seres
利用量子力学中众所周知的密度矩阵计算结果，推导出二阶非线性光学系数色散与一阶磁化率之间的简单近似关系。定义了一个新的SNLO系数张量，当输入光束在透明光谱范围内时，该张量保持对称性，而产生的光束也可以在吸收光谱范围内。对三种铁电晶体（KTP、linbo3和KNbO3）在可见光和近红外波段透明，以及两种半导体（GaP和GaAs）在可见光波段吸收，验证了该关系的有效性。与米勒定律相反，所提出的关系与测量结果很吻合。
A simple, approximate relation between the dispersion of the second-order nonlinear optical (SNLO) coefficient and first-order susceptibility has been derived using the well-known results of density-matrix calculation of quantum-mechanical theory. A new tensor of SNLO coefficient has been defined, which retains symmetries when the input beams are in the spectral range of transparency while the generated beam can also be in the spectral range of absorption. The validity of the relation has been checked for three ferroelectric crystals, KTP, LiNbO3and KNbO3, which are transparent in the visible and near infrared, and for two semiconductors, GaP and GaAs, which absorb in the visible. Contrary to Miller’s law, the presented relation is in good agreement with measurements.