Ultrashort laser pulse ablation of copper, silicon and gelatin: effect of the pulse duration on the ablation thresholds and the incubation coefficients
Chandra S.R. Nathala,Ali Ajami,Ali Ajami,Wolfgang Husinsky,Bilal Farooq,Sergey I. Kudryashov,Sergey I. Kudryashov,A. Daskalova,I. Bliznakova,Andreas Assion +9 more
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Abstract:
In this paper, the influence of the pulse duration on the ablation threshold and the incubation coefficient was investigated for three different types of materials: metal (copper), semiconductor (silicon) and biopolymer (gelatin). Ablation threshold values and the incubation coefficients have been measured for multiple Ti:sapphire laser pulses (3 to 1000 pulses) and for four different pulse durations (10, 30, 250 and 550 fs). The ablation threshold fluence was determined by extrapolation of curves from squared crater diameter versus fluence plots. For copper and silicon, the experiments were conducted in vacuum and for gelatin in air. For all materials, the ablation threshold fluence increases with the pulse duration. For copper, the threshold increases as τ
0.05, for silicon as τ
0.12 and for gelatin as τ
0.22. By extrapolating the curves of the threshold fluence versus number of pulses, the single-shot threshold fluence was determined for each sample. For 30 fs pulses, the single-shot threshold fluences were found to be 0.79, 0.35, and 0.99 J/cm2 and the incubation coefficients were found to be 0.75, 0.83 and 0.68 for copper, silicon and gelatin, respectively.read more
Citations
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Advanced laser scanning for highly-efficient ablation and ultrafast surface structuring: experiment and model.
Andrius Žemaitis,Mantas Gaidys,Marijus Brikas,Paulius Gečys,Gediminas Račiukaitis,Mindaugas Gedvilas +5 more
TL;DR: A new model of rectangular cavity ablation is introduced that takes into account the decrease in ablation threshold, as well as saturation of the ablation depth with increasing number of pulses per spot, which shows good agreement with the experimental results.
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Using LIBS to diagnose melanoma in biomedical fluids deposited on solid substrates: Limits of direct spectral analysis and capability of machine learning
R. Gaudiuso,R. Gaudiuso,Ebo Ewusi-Annan,Noureddine Melikechi,Xinzi Sun,Benyuan Liu,Luis Felipe Campesato,Taha Merghoub,Taha Merghoub +8 more
TL;DR: A Laser-Induced Breakdown Spectroscopy (LIBS) approach to early diagnosis of a form of skin cancer, melanoma, based on the analysis of biological fluids harvested from diseased mice and healthy controls is reported.
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Few-cycle pulse laser induced damage threshold determination of ultra-broadband optics.
TL;DR: Stark morphological contrast was observed between multi-pulse damage sites formed in air versus those in vacuum, and one effect of vacuum testing compared to air included suppression of laser-induced periodic surface structures (LIPSS) formation, possibly influenced by a reduced presence of damage debris.
Journal ArticleDOI
Ultrafast dynamics and subwavelength periodic structure formation following irradiation of GaAs with femtosecond laser pulses
Athanasios Margiolakis,Athanasios Margiolakis,George D. Tsibidis,Keshav M. Dani,Giorgos P. Tsironis +4 more
TL;DR: In this paper, a theoretical investigation of the ultrafast processes and dynamics of the excited carriers upon irradiation of GaAs with femtosecond pulsed lasers is performed in conditions that induce material damage and eventually surface modification of the heated solid.
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Modelling of the ultrafast dynamics and surface plasmon properties of silicon upon irradiation with mid-IR femtosecond laser pulses
TL;DR: In this paper, a theoretical investigation of the ultrafast processes and dynamics of the produced excited carriers upon irradiation of silicon with femtosecond pulsed lasers in the mid-infrared (mid-IR) spectral region is presented.
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