%0 Journal Article
%A Zhao, Dongye
%A Gierse, Niels
%A Wegner, Julian
%A Pretzler, Georg
%A Oelmann, Jannis
%A Brezinsek, Sebastijan
%A Liang, Yunfeng
%A Neubauer, Olaf
%A Rasinski, Marcin
%A Linsmeier, Christian
%A Ding, Hongbin
%T Ablation mass features in multi-pulses femtosecond laser ablate molybdenum target
%J Nuclear instruments & methods in physics research / B
%V 418
%@ 0168-583X
%C Amsterdam [u.a.]
%I Elsevier
%M FZJ-2021-01481
%P 54 - 59
%D 2018
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000426223400008
%R 10.1016/j.nimb.2017.12.030
%U https://juser.fz-juelich.de/record/891392