不同脉冲激光波形在打孔实验上的比较与分析

为了获得高质量小孔,克服单脉冲激光打孔的不足,设计了一种能够产生多脉冲激光波形的激光器电源.并在1mm厚的薄钢片上得到直径小于1mm的小孔.多脉冲打孔理论分析表明,多脉冲激光打孔不但减少了熔融物和等离子体的产生,而且降低了激光打孔对高能量的要求,获得的小孔质量优于单脉冲激光打孔.另外脉冲宽度和脉冲间距的选择对激光小孔加工质量起决定性作用,在加工高质量孔的时候,应该选用较短的激光脉冲宽度.实验表明,利用三脉冲激光输出波形打孔所获得的小孔质量要优于单脉冲激光打孔效果,有效脉冲平均能量为350mJ,宽度为100μs,脉冲间距为100μs.

Comparisons and Analysis of Drilling Experiment Using Different Pulse Laser Waveforms

In order to obtain the high quality small holes and overcome the shortcomings of single pulse laser drilling, a new multi pulse laser wave is introduced. Using the new manner, the hole of which the diameter is less than 1 mm, is obtained in 1mm thick steel. Depending on the basic of theoretical analysis of multi pulse drilling, the multi pulse drilling can reduce the generation of melt interest and plasma, and the requirement of high energy for laser drilling. And it can also obtain the higher quality of drilling than the single laser drilling. In addition, the option of pulse width and pulse spacing is important for maching quality of laser drilling. It should choose shorter laser pulse width, when machine the high quatity hole. Through the comparison and analysis of drilling results which are generated by waveforms of single pulse laser and multi pulse laser, it is known that the quality of drilling results generated by waveform of three pulse laser is superior to those of single pulse laser. And it is found that the average energy of effective pulse is 350 mJ, and the optimum pulse width and the best pulse interval are both 100 μs.