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应用气相传输平衡技术 ,我们获得了 3种近化学计量比掺镁铌酸锂晶体 ,晶体的掺镁量接近我们以前提出的第二阈值。在我们实验室所能达到的最大光强 2 6MW/cm2 照射下 ,在所有近化学计量比掺镁铌酸锂晶片中没有观察到光斑畸变 ,该光强比同成分铌酸锂晶体所能承受的光强高 6个量级 ,为目前已报道的铌酸锂晶体之最。应用双光束全息写入法测得掺 1.0mol%Mg近化学计量比铌酸锂晶体的光折变饱和值仅有 4 .6× 10 -7,比同成分铌酸锂晶体小两个量级 ,从已有实验数据推测 ,该晶体的抗光折变能力应当比同成分铌酸锂晶体高 9个量级以上。
Using gas-phase transport equilibrium techniques, we obtained three near-stoichiometric MgO-doped lithium niobate crystals with Mg-doped Mg content approaching the second threshold we previously proposed. No spot distortion was observed in all near-stoichiometric MgO-doped lithium niobate wafers at the maximum light intensity of 26 MW / cm2 that our laboratory can achieve, which is comparable to that of the same composition lithium niobate crystals Of the light intensity of 6 orders of magnitude, is the most reported lithium niobate crystals. The photorefractive saturation of 1.0mol% Mg near stoichiometric lithium niobate crystals measured by the double beam holographic writing method is only 4.6 × 10 -7, which is two orders of magnitude smaller than that of the same composition lithium niobate It is presumed from the existing experimental data that the photorefractive capability of the crystal should be 9 orders of magnitude higher than that of the same composition lithium niobate.