说明：  鲍威尔棱镜是一种光学划线棱镜，它使激光束通过后可以最优化地划成光密度均匀、稳定性好、直线性好的一条直线。鲍威尔棱镜划线优于柱面透镜的划线模式，能消除高斯光束的中心热点和褪色边缘分布。
(Powell prism is an optical crossed prism, it can make the laser beam through a straight line optimization into light uniform density, good stability, good linearity. The drawing of Powell prism is better than that of cylindrical lens, which can eliminate the central hot spot of Gauss beam and the distribution of discoloration edge.)