In addition, it is because collimatedlaserbeam is free of focusing problem that output image can be projected to curve surface.
另外由于准直的激光束不存在聚焦问题，输出的图像能够准确投影到曲面上。
2
Dynamic modulation of laser and laser bean, and offset to target reflection coefficient: laser bean is shaped and collimated to round and slender beam by using of the semiconductor laser.