长脉冲高能激光能量测试技术的研究

用锥形腔量热式激光能量计,测量了在不同脉冲宽度条件下,脉冲激光能量和激光吸收腔温升之间的关系,并用传统的方法得到不同激光能量对应的温升,并按照有关公式计算得到激光能量,结果表明实际激光能量和按传统方法计算得到的激光能量之间存在较大的差距;我们从理论上分析了由于热辐射、热传导影响,得出锥形吸收腔时间温度曲线关系的数学模型;用该数学模型对测量得到温度时间曲线进行最小二乘法拟合,拟合曲线和实际曲线非常吻合;通过该曲线我们对测量结果进行修正,和传统数据处理方法比较,该方法得到的结果更接近真值.

Study on The Measurement of Long Pulse High Power Laser Energy

A taper absorbed energy chamber has been designed and processed to measure the relationship between the laser energy and the temperature of the taper absorbed energy chamber under different pulse width using the principle of calorimetry. The temperature rising curve of the taper absorbed energy chamber with different laser energy pulse and the pulse laser energy by means of calculation according to relative expression by use of traditional method have been gained. The results show that there exists great difference between the actual results and the measured results. Heat radiation and thermal conduct have been unanalyzed theoretically. The mathematical model of time temperature curve has been built. The fit curve got from this mathematical model good fit the measured curve.The measurement result has been revised by using the fit curve . The results uncertainty will reduce greatly after revising.