TY  - JOUR
AU  - Zhao, Dongye
AU  - Gierse, Niels
AU  - Wegner, Julian
AU  - Pretzler, Georg
AU  - Oelmann, Jannis
AU  - Brezinsek, Sebastijan
AU  - Liang, Yunfeng
AU  - Neubauer, Olaf
AU  - Rasinski, Marcin
AU  - Linsmeier, Christian
AU  - Ding, Hongbin
TI  - Ablation mass features in multi-pulses femtosecond laser ablate molybdenum target
JO  - Nuclear instruments & methods in physics research / B
VL  - 418
SN  - 0168-583X
CY  - Amsterdam [u.a.]
PB  - Elsevier
M1  - FZJ-2021-01481
SP  - 54 - 59
PY  - 2018
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000426223400008
DO  - DOI:10.1016/j.nimb.2017.12.030
UR  - https://juser.fz-juelich.de/record/891392
ER  -