全吸收旋转式高能激光能量计吸收腔设计

为了解决高能激光总能量测量中所面临的抗激光损伤能力问题，设计了一种新型旋转式全吸收激光能量计，具有测量不确定度低、系统结构简单、环境适应性强等诸多优点，尤其在长时间出光的强激光能量测量中具有独特优势。光线追迹软件数值模拟结果表明激光辐照过程中能量逃逸率小于0.3%。利用有限元软件，模拟计算了连续激光辐照下能量吸收体的温度场分布和最高温升情况，给出了热吸收体最高温升与旋转速度的关系，分析了测温探测器安装深度对温度传感器测温曲线的影响。该旋转式能量计完全可以满足数十兆焦耳激光能量测量要求，也为更高能量的激光参数测试提供了一种全新的技术手段。

Design and analysis of absorbing cavity in full absorbing HEL rotational calorimeter

The method full absorbing is the most commonly technique to measure total energy of high energy laser(HEL), which is one of important technical indexes for parameters test of HEL. In order to improve the ability of laser damage resistance, in comprehensive consideration of work mode and temperature field distribution of energy absorbing graphite, a novel HEL rotational calorimeter was designed. The calorimeter especially applicable to laser long-time irradiation has a series of advantages, such as low measurement uncertainty, uncomplicated configuration and environmental adaptability. Numerical simulation results through method of ray tracing show that laser energy loss is less than 0.3 percent. The software based on finite element method was used to analyze temperature field distribution and maximum of absorb material, rotate speed-dependent temperature, temperature curve at the different positions of temperature sensor. Simulation results indicate that the calorimeter can be applied to several ten million joule(MJ) energy of HEL successfully, and provides a novel technique way for measurement of higher laser energy.