铌酸锂晶体的研究与分析样本

下载后可任意编辑摘 要本文基于新型线性电光效应耦合波理论, 经过设定超晶格周期极化铌酸锂晶体倒格矢参数, 从而弥补双折射时 o 光和 e 光折射率不同造成的相位失配。计算有效电光系数, 推倒耦合波方程的解析解。并利用 matlab进行线性仿真, 讨论温度, 波长, 外加电场和晶体占空比变化时对于电光效应中的转换效率的影响。仿真的数值结果表明: 随着温度与相位匹配时对应的温度的差值的增大, 相位失配量将增加, 从而导致转换效率呈峰值逐渐降低的波动形式趋于零, 当温度满足相位匹配时转换效率最高; 另外晶体极化周期数量的增加, 将使得转换效率的波动更加剧烈, 其值也降低的更快, 波动次数也将增多。改变波长的情况基本类似于温度, 仅在波动细节上有细微差距。而电场对转换效率的影响则是成正比的线性关系。另外我们所取的占空比约等于 0.25 和 0.75 时将能够使转换效率取到最大值。关键词 铌酸锂; 电光效应; 耦合波; 转换效率下载后可任意编辑AbstractBased on the new wave coupling theory of linear electro-optic effect. By setting the grating wave vector parameters of periodically poled LiNbO crystal, we compensate for the phase-matched which is caused by different index of refraction of the o-ray and e-ray when birefringence happens.We can calculate the effective electro-optic coefficient of the system . Through the analytical solution of the wave coupling equations, use matlab to do linear simulation, and study on the influence of the conversion efficiency in the electro-optical effect when temperature, wavelength, electric field intensity and crystal duty cycle change.Numerical simulation results show that, with the increasing difference made by temperature which corresponds to the temperature and phase matching, the amount of phase mismatch will increase.it results in an increase of phase mismatch, thus causing the conversion efficiency to assume the fluctuating form tending to zero which the peak value reduces gradually; when the temperature satisfies pha...