Measurement technique on beam of laser near field intensity distributon based on CCD imange

Measurement methods about beam of laser near field intension distributing is carried out. The measurement methods include direct measurement by CCD and indirect measurement by diffuse reflection screen. As a result, different diffuse reflection screens bring on different measurement results. The great influence on measurement results is because of speckles while measured by indirect measurement. The results of direct measurement are close to real result. The speckles affect measurement result.