从激光光斑有效面积的定义出发,采用CCD图像摄取技术,设计了一套激光光斑有效面积测量装置.在4种不同激光光斑能量分布和不同能量密度的情况下,用有效面积测量仪分别进行了实际测试验证.结果表明,该测量装置可以对任何能量非均匀分布的激光光斑的有效面积进行准确测试,有助于提高光学元件激光损伤阈值的测量精度.

The system for effective area measurement of laser spot on target plane was designed based on the definition of effective area. A 12-bit CCD camera is used for the effecive area measurement. A bmp image of the beam profile is stored. This image is processing by software to evaluate the ratio of total energy and peak fluence (effective area). Some test results were given using effective area measurement system. The system was employed in the laser induced damage threshold test and it is helpful to improving the precision of laser induced damage threshold test.