A model to predict the ablation width and calculate the ablation threshold of femtosecond laser

2018 ◽  
Vol 456 ◽  
pp. 482-486 ◽  
Author(s):  
Jianchao Liang ◽  
Weidong Liu ◽  
Yao Li ◽  
Zhen Luo ◽  
Dongqing Pang
Keyword(s):  
Femtosecond Laser ◽  
Ablation Threshold

Femtosecond laser corneal ablation threshold: Dependence on tissue depth and laser pulse width

2007 ◽  
Vol 39 (8) ◽  
pp. 654-658 ◽  
Author(s):  
Hui Sun ◽  
Meng Han ◽  
Markolf H. Niemz ◽  
Josef F. Bille
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Pulse Width ◽  
Ablation Threshold ◽  
Laser Pulse Width

scholarly journals Особенности наноструктурирования поверхности кремния в результате ее сверхбыстрого нагрева фемтосекундным лазерным импульсом в воде

2018 ◽  
Vol 44 (14) ◽  
pp. 58
Author(s):  
С.А. Ромашевский
Keyword(s):  
Atomic Force Microscopy ◽  
Laser Pulse ◽  
Femtosecond Laser ◽  
Surface Morphology ◽  
Silicon Surface ◽  
Ablation Threshold ◽  
Water Environment ◽  
Force Microscopy ◽  
Atomic Force ◽  
Minimum Depth

AbstractSilicon surface morphology induced by a femtosecond laser pulse at near-threshold fluences in water environment is investigated by means of atomic-force microscopy (AFM). With increasing fluence, the silicon surface transforms into nanoscale ring-shaped and blister structures, as well as smooth and nanostructured microcraters with a minimum depth of 1 nm. The formation of starlike patterns imprinted at the surface of microcraters at fluences above the ablation threshold is observed.

scholarly journals Machining millimeter-scale deep holes in SiCf/SiC material using femtosecond laser filamentation effect

2018 ◽  
Vol 2 (3) ◽  
Author(s):  
Jie Zhao 1,2 ◽  
Wenjun Wang 1,2 ◽  
Ruijia Wang 1,2 ◽  
Jianlei Cui 1,2
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Femtosecond Laser ◽  
Surface Morphology ◽  
Peak Power ◽  
Processing Time ◽  
Ablation Threshold ◽  
Focus Position ◽  
Laser Focus ◽  
Scanning Electron

A 3.5 mm thick SiCf/SiC material was drilled in air environment using a femtosecond laser filament effect. The surface morphology of deep micropores was observed by scanning electron microscopy and the depth and profile of the pores were observed using μm-CT. The variation of entrance diameter, exit diameter and depth variation with laser focus position and processing time was further analyzed. The results showed that as the processing time of femtosecond laser increases, the ablation threshold of the material reached saturation. The exit and entrance diameter also stopped increasing and the aperture tend to saturate. The focus entered the interior of the material, allowing the location of the peak power near the surface of the material. So the entrance aperture was of good quality and the exit aperture was round.

scholarly journals Modeling for Copper Ablation by Ultrashort Laser Bursts-Train

2019 ◽  
Vol 11 (1) ◽  
pp. 30-35
Author(s):  
Ahmed Abdelmalek ◽  
Zeyneb Bedrane ◽  
El-Hachemi Amara
Keyword(s):  
Femtosecond Laser ◽  
Pulse Train ◽  
Metal Film ◽  
Ablation Threshold ◽  
Thermal Relaxation ◽  
Femtosecond Laser Irradiation ◽  
High Fluence ◽  
Temperature Model ◽  
Focal Volume ◽  
Ultrashort Laser

Ablation of copper using multipulse femtosecond laser irradiation with an 800 nm wavelength and 900-fs pulse duration is investigated theoretically using a dynamic tow temperature model. Our results show that the irradiation of a metal film by burst femtosecond laser with a separation time between pulses less than the thermal relaxation time can dramatically enhance the irradiated focal volume without a significant dissipation of the energy inside the material. We demonstrate the advantage of burst irradiation at low fluence where the cooper can be ablated below single ablation threshold. We also suggest that at high fluence, irradiation with a burst-train may give rise to a cleaner ablation than with a pulse-train.

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