Self-focusing and maximum ablation depth in ultrafast laser surgery of tissue (Conference Presentation)

2018 ◽  
Author(s):  
Chris Martin ◽  
Adela Ben-Yakar
Keyword(s):  
Laser Surgery ◽  
Ablation Depth ◽  
Ultrafast Laser ◽  
Self Focusing

Role of molecular photodissociation in ultrafast laser surgery

2015 ◽  
Author(s):  
Jenny Wang ◽  
Georg Schuele ◽  
Phil Huie ◽  
Daniel V. Palanker
Keyword(s):  
Laser Surgery ◽  
Ultrafast Laser ◽  
Molecular Photodissociation

Ultrafast Photon-Electron Interactions in Dielectrics by a Single Laser Pulse

2004 ◽  
Author(s):  
L. Jiang ◽  
H. L. Tsai
Keyword(s):  
Laser Pulse ◽  
Impact Ionization ◽  
Fused Silica ◽  
Ablation Depth ◽  
Ultrafast Laser ◽  
Quantum Mechanical ◽  
Free Electrons ◽  
Electron Generation ◽  
Major Factors ◽  
Crater Shape

This study develops a quantum mechanical model to investigate energy absorption in ultrafast laser of dielectrics. The model investigates the optical property variations, electron temperature, and density changes at femtosecond scales. The ionizations and electron heating are two major factors considered for pulse absorption occurring within the pulse duration. The flux-doubling model is employed to calculate the free electron generation mainly through impact ionization and photoionization. The quantum mechanical treatments are used to account for the specific heat and the relaxation time for free electrons. The time and space dependent optical properties of the dense plasma generated by the ultrafast laser pulse are calculated. The predictions of ablation threshold and ablation depth of fused silica and barium aluminum borosilicate (BBS) are in good agreements with published experimental data. The model greatly improves the accuracy in predicting the ablation depth and can predict the crater shape.

scholarly journals Ultrafast laser surgery probe with a calciumfluoride miniaturized objective for bone ablation

2021 ◽  
Author(s):  
Kaushik Subramanian ◽  
Liam Andrus ◽  
Michal Pawlowski ◽  
Ye Wang ◽  
Tomasz Tkaczyk ◽  
...  
Keyword(s):  
Laser Surgery ◽  
Ultrafast Laser

Ultrafast laser surgery probe for bone tissue microsurgery

2021 ◽  
Author(s):  
Liam P. Andrus ◽  
Kaushik Subramanian ◽  
Michal E. Pawlowski ◽  
Ye Wang ◽  
Tomasz Tkaczyk ◽  
...  
Keyword(s):  
Bone Tissue ◽  
Laser Surgery ◽  
Ultrafast Laser

Molecular-dynamics study of multi-pulsed ultrafast laser interaction with copper

2021 ◽  
Vol 16 (4) ◽  
pp. 457-472
Author(s):  
C.P. Yin ◽  
S.T. Zhang ◽  
Y.W. Dong ◽  
Q.W. Ye ◽  
Q. Li
Keyword(s):  
Molecular Dynamics ◽  
Laser Processing ◽  
Pulsed Laser ◽  
Copper Film ◽  
Temperature Curve ◽  
Ablation Depth ◽  
Ultrafast Laser ◽  
Laser Machining ◽  
Incubation Effect ◽  
Two Temperature

Ultrafast laser has an undeniable advantage in laser processing due to its extremely small pulse width and high peak energy. While the interaction of ultrafast laser and solid materials is an extremely non-equilibrium process in which the material undergoes phase transformation and even ablation in an extremely short time range. This is the coupling of the thermos elastic effect caused by the pressure wave and the superheated melting of the material lattice. To further explore the mechanism of the action of ultrafast laser and metal materials, the two-temperature model coupling with molecular dynamics method was used to simulate the interaction of the copper and laser energy. Firstly, the interaction of single-pulsed laser and copper film was reproduced, and the calculated two-temperature curve and the visualized atomic snapshots were used to investigate the influence of laser parameters on the ablation result. Then, by changing the size of the atomic system, the curve of ablation depth as a function of laser fluence was obtained. In this paper, the interaction of multi-pulsed laser and copper was calculated. Two-temperature curve and temperature contour of copper film after the irradiation of double-pulsed and multi-pulsed laser were obtained. And the factors which can make a difference to the incubation effect were analyzed. By calculating the ablation depth under the action of multi-pulsed laser, the influence of the incubation effect on ablation results was further explored. Finally, a more accurate numerical model of laser machining metal is established and verified by an ultra-short laser processing experiment, which provides a new calculation method and theoretical basis for ultra-fast laser machining of air film holes in aviation turbine blades, and has certain practical guiding significance for laser machining.

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