Czochralski Crystal Growth Process for Organic Nonlinear Crystals

9361815鲁德曼尽管有报道称，与现有的最好的无机晶体相比，几种有机非线性单晶具有非常高的品质因数，但有机非线性晶体目前还没有被用于工业、科学或国防以及航空航天激光系统。我们将这主要归因于缺乏足够大的高质量单晶的供应。有机非线性晶体的生长、制备和抛光技术目前尚不成熟。文献中报道的用于有机非线性晶体的晶体生长技术一直是溶液生长，而复杂化合物的Bridgman和晶体尺寸一直在几毫米或更小的数量级。我们建议开发一种能够产生大(2-3厘米)高完整性晶体的直拉法晶体生长工艺，开发制备和抛光这种晶体的方法，并对它们的晶体完整性、光吸收系数、激光损伤、频率转换效率和电光性能进行表征。MMONS(3-甲基-4-甲氧基-4‘-亚硝基二苯乙烯)据报道具有最大的非线性优值系数，将被用作模型晶体，所有工作都将在该晶体上进行。然而，所开发的生长工艺和制造技术将适用于广泛的有机非线性晶体。***

9361815 Ruderman Although several organic nonlinear single crystals have been reported to have exceptionally high figures of merit compared with the best inorganic crystals available, organic nonlinear crystals are not now being used in industrial, scientific or defense and aerospace laser systems. We attribute this principally to the lack of a supply of high quality single crystals of a large enough size to be useful. The technology for the growth, fabrication and polishing of organic nonlinear crystals is no now available. The crystal growth techniques reported in the literature for organic nonlinear crystals have been solution and Bridgman and crystal sizes for complex compounds have been of the order of a few mm or less. We propose to develop a Czochralski crystal growth process capable of producing large (2 to 3 cm) crystals of high perfection, to develop methods for fabricating and polishing such crystals and to characterize them with respect to crystal perfection, optical absorption coefficients, laser damage, frequency conversion efficiency and electro-optic properties. MMONS (3-Methyl-4-Methoxy-4'-nitrostilbene) which has been reported to have one of the largest nonlinear figures of merit, will be used as a model crystal and all work will be carried out with this crystal. However, the growth process as well as fabrication techniques that are developed will be applicable to a wide range of organic nonlinear crystals. ***