CAJ | 학술논문

为了在应用中提高读出光的衍射效率,必须合理选择参量.采用将KOGELNIK的耦合波理论与Kukhtarev方程相结合,可以得出顺电相KTN晶体中透射型相位栅衍射效率的解析式.对影响光栅衍射效率的各因素进行计算分析,发现衍射效率对入射角、晶体厚度以及外加电场的变化敏感,而45°入射角附近出现较宽的高衍射区.另外,晶体的吸收对衍射效率的影响可以忽略.结果表明,该计算分析有助于在实践中调整参量以获得较高的读出光衍射效率.
위료재응용중제고독출광적연사효솔,필수합리선택삼량.채용장KOGELNIK적우합파이론여Kukhtarev방정상결합,가이득출순전상KTN정체중투사형상위책연사효솔적해석식.대영향광책연사효솔적각인소진행계산분석,발현연사효솔대입사각、정체후도이급외가전장적변화민감,이45°입사각부근출현교관적고연사구.령외,정체적흡수대연사효솔적영향가이홀략.결과표명,해계산분석유조우재실천중조정삼량이획득교고적독출광연사효솔.
In order to improve the diffraction efficiency of read out light,reasonable parameters must be selected.Combining Kogelnik coupling wave theory with the Kukhtarev equations,the expression of the diffraction efficiency of the transmission grating in paraelectric KTN crystal was obtained.After analyzing the factors affecting the diffraction efficiency of a grating,it was found that the reading diffraction efficiency was sensitive to incident angle,crystal thickness and applied field.A high diffraction efficiency district existed in close vicinity of 45°incident angle.The influence of absorption of crystal on reading diffraction efficiency was negligible.The results provide useful guides to choose the optimal parameters for high reading diffraction efficiency in application.