|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Effect of fluence and ambient environment on the surface and structural modification of femtosecond laser irradiated Ti显示文摘Under certain conditions, ultrafast pulsed laser interaction with matter leads to the formation of self-organized conical as well as periodic surface structures(commonly reffered to as, laser induced periodic surface structures, LIPSS). The purpose of the present investigations is to explore the effect of fsec laser fluence and ambient environments(Vacuum &O_2) on the formation of LIPSS and conical structures on the Ti surface. The surface morphology was investigated by scanning electron microscope(SEM). The ablation threshold with single and multiple(N = 100) shots and the existence of an incubation effect was demonstrated by SEM investigations for both the vacuum and the O_2 environment. The phase analysis and chemical composition of the exposed targets were performed by x-ray diffraction(XRD) and energy dispersive x-ray spectroscopy(EDS), respectively. SEM investigations reveal the formation of LIPSS(nano & micro). FFT d-spacing calculations illustrate the dependence of periodicity on the fluence and ambient environment. The periodicity of nano-scale LIPSS is higher in the case of irradiation under vacuum conditions as compared to O_2. Furthermore, the O2 environment reduces the ablation threshold. XRD data reveal that for the O_2 environment, new phases(oxides of Ti) are formed. EDS analysis exhibits that after irradiation under vacuum conditions, the percentage of impurity element(Al) is reduced. The irradiation in the O_2 environment results in 15% atomic diffusion of oxygen. | Umm-i-Kalsoom Shazia Bashir Nisar Ali M Shahid Rafique Wolfgang Husinsky Chandra S R Nathala Sergey V Makarov Narjis Begum | 2016 | Chinese Physics B2016，25，1： | 2 |
| 2 | Ultrashort laser ablation of metals: Pump-probe experiments, the role of ballistic electrons and the two-temperature model 显示文摘 | Schmidt V Husinsky W Betz G | 2002 | Appl Surf Sci2002，197，： | 1 |
| 3 | Ultra-short laser ablation of met als and semiconductors:evidence of ultrafast Coulomb explosion显示文摘 | DACHRAOUI H HUSINSKY W BETZ G | | 0，，02： | 1 |
| 4 | A straightforward synthesis and structure-activity relationship of highly efficient initiators for two-photon polymerization显示文摘 | Li Z Pucher N Cicha K Torgersen J Ligon S C Ajami A Husinsky W Rosspeintner A Vauthey E Naumov S Scherzer T Stampfl J Liska R | 2013 | Macromolecules2013，46，2： | 1 |
| 5 | Fast electronic and thermal processes in femtosecond laser ablation of Au显示文摘 | DACHRAOUI H HUSINSKY W | 2006 | Appl Phys Leas2006，89，10： | 1 |
| 6 | Femtosecond laser induced nanostructuring of zirconium in liquid confined environment显示文摘The surface, structural, and mechanical properties of zirconium after irradiation with Ti: sapphire laser(800 nm, 30 fs,1 k Hz) have been investigated. The zirconium targets were exposed for a varying number of laser pulses ranging from 500 to 2000 at a fixed fluence of 3.6 J/cm^2 corresponding to an intensity of 1.2×10^(14)W/cm^2 in ambient environments of deionized water and propanol. A scanning electron microscope(SEM) was employed to investigate the surface morphology of the irradiated zirconium. The SEM analysis shows the formation of various kinds of features including nanoscale laser induced periodic surface structures(LIPSS), sponge like surface structure, flakes, conical structures, droplets, pores, and cavities. The energy dispersive x-ray spectroscopy(EDS) analysis exhibits the variation in chemical composition along with an enhanced diffusion of oxygen under both ambient conditions. The crystal structure and phase analyses of the exposed targets were explored by x-ray diffraction(XRD) and Raman spectroscopy techniques, respectively. The XRD analysis confirms the presence of various phases of zirconium hydride and zirconia after ablation in both de-ionized water and propanol. However, excessive hydrides are formed in the case of propanol. The Raman analysis supports the EDS and XRD results. It also reveals the presence of oxides(zirconia) after irradiation in both de-ionized water and propanol environments.The chemical reactivity of zirconium was significantly improved in the presence of liquids which were accountable for the growth of novel phases and modification in the chemical composition of the irradiated Zr. A nanohardness tester was employed to measure the nanohardness of the laser treated targets. The initial increase and then decrease in nanohardness was observed with an increase in the number of laser pulses in the de-ionized water environment. In the case of propanol,a continuous decrease in hardness was observed. | Nisar Ali Shazia Bashir Umm-i-Kalsoom M.Shahid Rafique Narjis Begum Wolfgang Husinsky Ali Ajami Chandra S.R.Natahala | 2017 | Chinese Physics B2017，26，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员