From supercritical hydrodynamic expansion to explosive phase change: Thermodynamic evolution of water during its interaction with high-intensity infrared nanosecond-pulsed laser

2009 ◽  
Vol 105 (5) ◽  
pp. 053502 ◽  
Author(s):  
Benxin Wu
Keyword(s):  
Phase Change ◽  
High Intensity ◽  
Pulsed Laser ◽  
Nanosecond Pulsed Laser ◽  
Explosive Phase

Non-Equilibrium Phase Change in Metal Induced by Nanosecond Pulsed Laser Irradiation

2001 ◽  
Vol 124 (2) ◽  
pp. 293-298 ◽  
Author(s):  
Xianfan Xu ◽  
David A. Willis
Keyword(s):  
Phase Change ◽  
Laser Irradiation ◽  
Rapid Heating ◽  
Equilibrium Phase ◽  
Saturation Pressure ◽  
Pulsed Laser ◽  
Superheated Liquid ◽  
Phase Explosion ◽  
Nanosecond Pulsed Laser ◽  
Non Equilibrium

Materials processing using high power pulsed lasers involves complex phenomena including rapid heating, superheating of the laser-melted material, rapid nucleation, and phase explosion. With a heating rate on the order of 109K/s or higher, the surface layer melted by laser irradiation can reach a temperature higher than the normal boiling point. On the other hand, the vapor pressure does not build up as fast and thus falls below the saturation pressure at the surface temperature, resulting in a superheated, metastable state. As the temperature of the melt approaches the thermodynamic critical point, the liquid undergoes a phase explosion that turns the melt into a mixture of liquid and vapor. This article describes heat transfer and phase change phenomena during nanosecond pulsed laser ablation of a metal, with an emphasis on phase explosion and non-equilibrium phase change. The time required for nucleation in a superheated liquid, which determines the time needed for phase explosion to occur, is also investigated from both theoretical and experimental viewpoints.

Inside process of glass with nanosecond pulsed laser

2008 ◽  
Author(s):  
Takeji Arai ◽  
Noritaka Asano ◽  
Akihiko Minami ◽  
Hideaki Kusano
Keyword(s):  
Pulsed Laser ◽  
Nanosecond Pulsed Laser

Removal mechanism of surface cleaning on TA15 titanium alloy using nanosecond pulsed laser

2021 ◽  
Vol 139 ◽  
pp. 106998
Author(s):  
Zhichao Li ◽  
Donghe Zhang ◽  
Xuan Su ◽  
Shirui Yang ◽  
Jie Xu ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Pulsed Laser ◽  
Surface Cleaning ◽  
Removal Mechanism ◽  
Nanosecond Pulsed Laser ◽  
Ta15 Titanium Alloy
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