Ablation mass features in multi-pulses femtosecond laser ablate molybdenum target
Ablation mass features in multi-pulses femtosecond laser ablate molybdenum target
In this study, the ablation mass features related to reflectivity of bulk Molybdenum (Mo) were investigated by a Ti: Sa 6 fs laser pulse at central wavelength 790 nm. The ablated mass removal was determined using Confocal Microscopy (CM) technique. The surface reflectivity was calibrated and measure...
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Personal Name(s): | Zhao, Dongye |
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Gierse, Niels / Wegner, Julian / Pretzler, Georg / Oelmann, Jannis / Brezinsek, Sebastijan / Liang, Yunfeng / Neubauer, Olaf / Rasinski, Marcin / Linsmeier, Christian / Ding, Hongbin (Corresponding author) | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Published in: | Nuclear instruments & methods in physics research / B, 418 (2018) S. 54 - 59 |
Imprint: |
Amsterdam [u.a.]
Elsevier
2018
|
DOI: |
10.1016/j.nimb.2017.12.030 |
Document Type: |
Journal Article |
Research Program: |
Plasma-Wall-Interaction |
Publikationsportal JuSER |
In this study, the ablation mass features related to reflectivity of bulk Molybdenum (Mo) were investigated by a Ti: Sa 6 fs laser pulse at central wavelength 790 nm. The ablated mass removal was determined using Confocal Microscopy (CM) technique. The surface reflectivity was calibrated and measured by a Lambda 950 spectrophotometer as well as a CCD camera during laser ablation. The ablation mass loss per pulse increase with the increasing of laser shots, meanwhile the surface reflectivity decrease. The multi-pulses (100 shots) ablation threshold of Mo was determined to be 0.15 J/cm2. The incubation coefficient was estimated as 0.835. The reflectivity change of the Mo target surface following multi-pulses laser ablation were studied as a function of laser ablation shots at various laser fluences from 1.07 J/cm2 to 36.23 J/cm2. The results of measured reflectivity indicate that surface reflectivity of Mo target has a significant decline in the first 3-laser pulses at the various fluences. These results are important for developing a quantitative analysis model for laser induced ablation and laser induced breakdown spectroscopy for the first wall diagnosis of EAST tokamak. |