圆柱体腔振动稳定性研究

为了降低环境振动对光学谐振腔稳定性的影响,设计了对振动不敏感的超稳腔,采用有限元数值模拟的方法,通过改变相关参量,对两U型片支撑和双横梁支撑两种圆柱体腔的支撑方式进行了数值模拟,得到了腔体的形变图。结果表明,通过改进腔的支撑方式和调整支撑位置,可以降低腔长对振动的敏感度,找到腔长变化最小且两腔镜平行的关键支撑位置。该结果可用于激光稳频和高精密激光光谱实验中。

Microstructure and property of laser cladding Ti-matrix functional gradient layer

To improve the wear-resistance of Ti600, and alleviate thermal stress under hyperthermal and excessive temperature difference conditions, Ti-matrix functional gradient layer (FGL) on Ti600 substrate was prepared with pulsed Nd∶YAG. The microstructure and phase composition of FGL were investigated. And the friction wear properties of FGL, N-FGL and Ti600 substrate were examined in atmosphere. It was found that a rapidly solidified microstructure, consisting of in situ synthesized TiC reinforced phase distributed on FGL substance evenly and dispersely in the form of globular grains, had three main different shapes, i.e., bulky or imperfect arborescent crystal, fine or approximately equiaxial crystal and chopped fibriform crystal. The wear resistance of FGL and N-FGL was improved obviously. Friction coefficient and wear rate decreased significantly, 0.3~0.5 times of Ti600 substrate.