激光增益介质中自发辐射放大（ASE）是限制高功率板条激光器输出能量进一步提升的关键因素。ASE具有超宽角度分布的特性，需要将0°-全反射角°（52.8°）范围内的杂散光束都进行控制才能有效抑制ASE，但目前已有方法在角度范围和效率方面都不理想。本申请提出一个抑制激光增益介质中ASE的新思路：将倏逝波薄膜和超宽角度吸收黑膜耦合起来，构建一种可以兼顾倏逝波特性、超宽角度ASE吸收特性、热力稳定性及激光损伤特性的多功能薄膜。建立离线表征多功能ASE吸收膜对1064nm激光在YAG内部零度角至全反射角范围传输时吸收效果的方法；阐明全内反射条件下多功能薄膜的损伤特性及规律；掌握多功能薄膜倏逝波特性、ASE吸收特性、应力、热稳定性及损伤特性在高温条件下长期工作的演变规律和控制方法；实现兼顾光学特性、热力特性、损伤特性ASE吸收多功能薄膜研制，为高功率半导体泵浦激光器的ASE抑制问题提供关键技术支持。

The Amplified Spontaneous Emission (ASE), with the character of super wide angular distribution, is the key limiting factor that prohibiting improving the laser energy. The ASE can only be effectively suppressed by controlling the stray light in laser slab from 0 degree to Critical angle degree. There is no effective method can suppress the ASE until now. A novel solution to suppress the ASE was proposed, which deposit SiO2 and TiNxOy composite coating on the surface of laser gain medium. The part of SiO2 coating is used to play the role of keeping occurring total internal reflection, the part of TiNxOy coating with excellent thermal conductivity and heat stability is used to absorb the ASE in the wide angular range from 0 degree to Critical angle degree. A off-line testing method used to evaluate the ASE absorbing effect in the laser slab will be proposed. The laser damage characteristic of the multi-function coating under Critical angle will be explored. The evolution rule of the optical character, laser damage and thermal character of the multi-function coating under long time high temperature will be drawn. Based on these studies, the multi-function coating can be prepared successfully, which will support the improving performance of slab laser in the future.