脉冲激光器输出能量对薄膜损伤阈值测试的影响

薄膜损伤阈值是薄膜抗强激光作用的关键参数，而脉冲激光器的输出能量直接决定了激光薄膜损伤闲值测试结果及其测试精度。激光器的工作电压、频率以及传输距离是影响能量的重要因素。根据脉冲激光器的工作原理，建立了能量与电压、能量与频率和能量与传输距离的数学模型。在激光器工作电压范围内（300～1100V）进行了实验研究，结果表明：不同频率下建立的能量与电压的数学模型不同；同一工作频率下，激光输出能量与电压有两个线性区域；能量稳定性最好的区域其RMS值小于0．025，PV值小于0．07；输出能量随着探测距离的增加而减小。该结果为激光薄膜损伤阂值测试精度的提高提供了可靠的理论依据。

Influence of Pulsed Laser Output Energy on Film Damage Threshold Testing

Film damage threshold is the key parameter of anti high power laser. Pulse laser output energy determines the film laser damage threshold＇s test results and their accuracy directly. Laser operating voltage,operating frequency and detection distance are important factors in output energy. According to the principle of light-emitting laser pulse, mathematical models between energy and voltage, between energy and frequency, between energy and detection distance are established in this paper. Experiments are carried out in laser operating voltage range （300-1 100 V）. The results show that, firstly, the mathematical models between energy and voltage are different under different frequencies. Secondly, there are two linear regions between the laser output energy and voltage under the same operating frequency. Thirdly, RMS value is 0. 025, and the largest PV value is less than 0. 07 in the energy region in which energy stability is the best. Fourthly, energy decreases with the detection distance increasing. The results provide a reliable theoretical basis to improve measurement accuracy of thin film laser damage threshold.