论文部分内容阅读
阐述了一种用法布里珀罗(FP)谐振技术来测量新型铌镁酸铅钛酸铅(PMNT)透明电光陶瓷不同偏振光场矢量下二次电光系数的方法。PMNT透明电光陶瓷具有较大的折射率,非常容易形成FP谐振腔。根据陶瓷二次电光效应,PMNT在FP谐振腔内的谐振波长随着外加电压的升高而移动。改变入射光光场矢量的偏振状态,可以获得横电(TE)模式和横磁(TM)模式的二次电光系数γ33和γ13分别约为21.06×10-16 m2/V2和-1.76×10-16 m2/V2,这明显不同于常规的线性电光晶体。利用这个特征,在实验上设计了一个PMNT电控衍射光栅,对不同TE模和TM模衍射图样进行了分析,证实了研究结果的正确性。
A method for measuring the second-order electro-optical coefficients under the different polarized light field vectors of a novel lead niobate lead titanate (PMNT) transparent electro-optic ceramic is described by Fabry-Perot (FP) resonance technique. PMNT transparent electro-optic ceramic has a larger refractive index, very easy to form FP resonant cavity. According to the ceramic secondary electro-optic effect, the resonant wavelength of PMNT in the FP resonator moves with the increase of applied voltage. By changing the polarization state of incident light field vector, the quadratic electro-optical coefficients γ33 and γ13 of transverse (TE) mode and transverse TM modes are about 21.06 × 10-16 m2 / V2 and -1.76 × 10- 16 m2 / V2, which is obviously different from the conventional linear electro-optic crystal. Utilizing this feature, a PMNT electronically controlled diffraction grating was designed experimentally, and the diffraction patterns of different TE and TM modes were analyzed. The results verify the correctness of the results.