TY - JOUR
T1 - Picosecond pulsed laser ablation of liquid covered stainless steel
T2 - Effect of liquid layer thickness on ablation efficiency
AU - van der Linden, Sietse
AU - Hagmeijer, Rob
AU - Römer, Gert Willem
PY - 2019/4/1
Y1 - 2019/4/1
N2 - Under liquid laser ablation is a material removal technique in which a focused laser beam passes through a liquid layer on top of the surface of a sample to be processed. When compared to laser ablation without a liquid layer, material (re)deposition around ablated regions is decreased. In addition, the ablation efficiency of the process, in terms of the amount of material removed per pulse, can be optimized by careful variation of the height of the liquid layer: a liquid layer height variation as small as a few tenth of millimeters already has a measurable effect on the amount of ablated material. In studies reported in existing literature, the required liquid layer height is typically realized by pouring a pre-defined amount of liquid on top of the sample surface. Surface tension, however, causes the air-liquid interface at the boundaries of the domain to deviate from the planar interface away from the boundaries, which affects the accuracy with which the liquid layer height can be determined. To the best of our knowledge, these accuracy issues have not been studied in previous research. Therefore, an experimental setup is proposed which circumvents the issues of a curved free surface. Next, a 7 picosecond pulsed laser source (M2 ≤1.3) at a wavelength of 515nmwas employed at a repetition rate of 1 kHz to study the efficiency of laser ablation of stainless steel for a range of liquid layer heights. Our findings provide a more detailed quantification of crater depth as a function of liquid layer height than is available through existing literature.
AB - Under liquid laser ablation is a material removal technique in which a focused laser beam passes through a liquid layer on top of the surface of a sample to be processed. When compared to laser ablation without a liquid layer, material (re)deposition around ablated regions is decreased. In addition, the ablation efficiency of the process, in terms of the amount of material removed per pulse, can be optimized by careful variation of the height of the liquid layer: a liquid layer height variation as small as a few tenth of millimeters already has a measurable effect on the amount of ablated material. In studies reported in existing literature, the required liquid layer height is typically realized by pouring a pre-defined amount of liquid on top of the sample surface. Surface tension, however, causes the air-liquid interface at the boundaries of the domain to deviate from the planar interface away from the boundaries, which affects the accuracy with which the liquid layer height can be determined. To the best of our knowledge, these accuracy issues have not been studied in previous research. Therefore, an experimental setup is proposed which circumvents the issues of a curved free surface. Next, a 7 picosecond pulsed laser source (M2 ≤1.3) at a wavelength of 515nmwas employed at a repetition rate of 1 kHz to study the efficiency of laser ablation of stainless steel for a range of liquid layer heights. Our findings provide a more detailed quantification of crater depth as a function of liquid layer height than is available through existing literature.
KW - Ablation
KW - Distilled water
KW - Laser
KW - Liquid
KW - Picosecond
KW - Stainless steel
UR - http://www.scopus.com/inward/record.url?scp=85064172026&partnerID=8YFLogxK
U2 - 10.2961/jlmn.2019.01.0018
DO - 10.2961/jlmn.2019.01.0018
M3 - Article
AN - SCOPUS:85064172026
SN - 1880-0688
VL - 14
SP - 108
EP - 119
JO - Journal of laser micro nanoengineering
JF - Journal of laser micro nanoengineering
IS - 1
ER -