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提出了一种新型支撑结构以解决大口径晶体重力凹陷作用引起的三倍频转换效率损失问题。有限元分析结果表明:当KDP晶体及支撑结构均为理想平面时,重力作用导致的三倍频转换效率的损失量几乎为0。同时,针对不同倾斜角度下的接触面加工误差对三倍频转换效率的影响进行了大量的数值模拟。计算结果表明:采用新型支撑结构,不同倾斜角度对三倍频转换效率的影响基本相同;支撑结构表面存在随机加工误差对三倍频转换效率的影响程度较小;而当支撑结构存在凸形或凹形加工误差时,加工误差容许值必须控制在5μm范围内以实现高效三倍频输出。
A new type of support structure is proposed to solve the problem of loss of triplet conversion efficiency caused by the gravitational sag of large diameter crystals. The results of finite element analysis show that when the KDP crystal and the supporting structure are both ideal planes, the loss of the triplet frequency conversion efficiency due to gravity is almost zero. At the same time, a large number of numerical simulations have been carried out for the influence of processing error of the contact surface on the conversion efficiency of the triplet frequency under different tilt angles. The calculation results show that the effect of different tilting angles on the conversion efficiency of the triplet frequency is basically the same with the new support structure. The random processing errors on the support structure have less influence on the conversion efficiency of the triplet frequency. When the support structure has convexity or For concave machining error, the tolerance of machining error must be controlled in the range of 5μm to achieve high efficiency triple frequency output.