延迟位相在大功率CO_2多模激光束传输与聚焦中的重要性

Study of Beam Propagation and Focus of a High Power CO_2 Laser with a Phase Shift Analysis

采用激光光束的延迟位相分析法,研究了大功率CO_2激光束传输与聚焦时光束横截面的大小和光强分布的变换规律。采用大功率激光束光斑质量诊断仪测量了TLP6000型CO_2激光束在不同位置处横截面的大小和光强分布,理论分析与实际测量结果相吻合。根据延迟位相分析法,设计了在焦点附近获得最小的光强起伏变化的光学变换系统。

In laser materials processing, the transverse beam intensity distribution affects processing quality greatly. In this paper the phase shift (also called accessary phase overtaking) in laser beam is used to analyse the high power CO2 laser beam transverse size and intensity distribution. The transverse beam size and intensity distribution in different positions in a TLF6000 laser beam propagation were measure by UFF100. The theory is agreed with measurement. According to this theory, an optical transformation system is designed to attain the minimum laser beam intensity distribution near the laser beam focus.