Abstract When the laser irradiates the energetic material, the reaction temperature of the material is an important parameter to evaluate the safe processing of femtosecond pulse laser. In order to study the temperature evolutionary process caused by the interaction between femtosecond pulsed laser and reactive materials, by using the femtosecond pulse laser loading system combining with the infrared thermal imager, the radiation temperature distribution induced by laser irradiating traditional formulation Al/PTFE (polytetrafluoroethylene) reactive materials and the safe threshold of laser processing are studied under the condition of different laser pulse repetition frequencies and different laser action durations. The results show that the change rules of the central temperature and edge temperature of the laser irradiation area are different. The radiation temperature irradiated by 500 Hz laser is lower than that of 1000 Hz, and the reactive material is more sensitive when the laser frequency is lower. When the laser pulse repetition frequency is 1000 Hz, deflagration of the reactive material happens at about the moment of 131s. Meanwhile the temperature threshold of deflagration of the reactive material is about 706 K, and the ablation depth is about 4.92 mm.

中文翻译：

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飞秒脉冲激光辐照Al/PTFE反应材料的温度演化

摘要 激光照射含能材料时，材料的反应温度是评价飞秒脉冲激光加工安全性的重要参数。为了研究飞秒脉冲激光与反应性材料相互作用引起的温度演化过程，利用飞秒脉冲激光加载系统结合红外热像仪，对传统配方Al/PTFE（聚四氟乙烯）激光辐照引起的辐射温度分布进行了研究。 ) 研究了不同激光脉冲重复频率和不同激光作用持续时间条件下的反应材料和激光加工的安全阈值。结果表明，激光照射区域中心温度和边缘温度的变化规律不同。500Hz激光照射的辐射温度低于1000Hz，激光频率越低，反应材料越敏感。当激光脉冲重复频率为1000Hz时，反应材料的爆燃发生在大约131s的时刻。同时反应材料爆燃的温度阈值约为706 K，烧蚀深度约为4.92 mm。