Comparison of Machining with Long-Pulse Green and Ultrashort Pulse Lasers

Wynne, A E ; Stuart, B C

Lawrence Livermore National Laboratory

关键词: Removal;    Silicon Carbides;    Lawrence Livermore National Laboratory;    36 Materials Science;    Wavelengths;   

DOI  :  10.2172/15007282
RP-ID  :  UCRL-CR-145536
RP-ID  :  W-7405-ENG-48
RP-ID  :  15007282

美国|英语

来源: UNT Digital Library

【 摘 要 】

(1) LLNL measured the material removal rate from stainless steel, silicon carbide, rhenium, N5, hastalloy X, and titanium as a function of pulse fluence at a wavelength of 810 nm for pulse durations of 150 fs, 1.5 ps, 20 ps, and 500 ps. The spot size of the beam used was 150 microns in diameter and the nominal material thickness was 1-2 mm. These experiments were performed on the existing 1 kHz laser system. Holes of different penetration depths were obtained to ascertain change in removal rate as a function of depth. Measurements included electron microscopy of selected samples. (2) The experiments in I were repeated for all materials but select pulse durations with the sample in a vacuum of base pressure 10 mTorr to determine if hole quality and ablation rate is improved. (3) LLNL measured material removal rate from stainless steel, silicon carbide, rhenium, N5, hastalloy X, and titanium as a function of pulse fluence at a wavelength of 532 nm for pulse duration at 200 ns. The spot size of the beam used was 200 microns in diameter and the material thickness was the same as in task I. Holes of different penetration depths were obtained to ascertain changes in removal rate as a function of depth.