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在激光损伤测量系统中,利用光散射法判别激光薄膜损伤,需要寻求光源和探测器之间的最佳位置。为此,在不同损伤激光脉冲能量、不同测量入射角度(0°,30°,45°,60°)和不同探测器距离(200,250 mm)条件下,研究了损伤点散射光能量的角分布。获得结果如下:在相同的探测角度上,散射光能量随着损伤面积和测试光入射角度增加而增加。在探测角度小于反射角度时,随着探测角度增加散射光能量逐渐变强;当探测角度大于反射角度后,随着散射角度增加散射光能量逐渐变弱。散射光相对能量在反射光方向附近出现极大值;在60°入射时,散射光相对能量具有最大值;探测距离在200 mm时,最大散射光相对能量大于探测距离在250 mm时。根据以上结论,可以确定在利用光散射判别损伤的测量系统中,探测器应放置在反射光方向的两侧,并且尽量增加测试光入射角度和缩小探测器与样片间距离。
In laser damage measurement systems, the use of light scattering to discriminate laser thin film damage, the need to seek the best position between the light source and the detector. For this reason, the angular distribution of the energy of the scattered light at the damage point is studied under different laser pulse energy, different incident angles (0 °, 30 °, 45 °, 60 °) and different detector distances (200 and 250 mm). The results are as follows: At the same detection angle, the energy of the scattered light increases as the damage area and angle of incidence of the test light increase. When the detection angle is less than the reflection angle, the energy of the scattered light gradually becomes stronger as the detection angle increases. When the detection angle is greater than the reflection angle, the energy of the scattered light becomes weaker as the scattering angle increases. The relative energy of the scattered light reaches a maximum around the direction of the reflected light. When the incident light is at 60 °, the relative energy of the scattered light has a maximum value. When the detection distance is 200 mm, the relative energy of the maximum scattered light is greater than the detection distance of 250 mm. Based on the above conclusions, it can be determined that in the measurement system using light scattering to determine the damage, the detectors should be placed on both sides of the direction of the reflected light, and try to increase the incident angle of the test light and reduce the distance between the detector and the sample.