Mass removal modes in the laser ablation of silicon by a Q-switched diode-pumped solid-state laser (DPSSL)

Self Cite

In this article, vaporization processes in the laser interaction with materials are studied theoretically and computationally, focusing on evaporation and homogeneous bubble nucleation. Simulations are carried out using the Redlich-Kwong equation of state and temperature-dependent material property models that can be used up to the critical point. From theoretical considerations, four important temperatures are identified in the understanding of laser material interaction. This study also shows that there are upper limits to the amount of energy that can be consumed by vaporization, which takes place at a temperature that is lower than the material's critical point. This study also discusses the transition from the thermal mode of ablation to the nonthermal mode in terms of the energy capacity of homogeneous boiling.

Section: -4supporting

confidence: 70%

On vaporization in laser material interaction

2010

Self Cite

“…[5][6][7][8][9][10] Plant leaves, especially green leaves, are common landscaping and agricultural materials and lasers could be creatively used for many possible innovative applications. Plant leaves exhibit very complicated optical properties because they have complex multilayer structures and are basically a composite of many dissimilar optical elements, including photosynthesizing pigments.…”

mentioning

confidence: 99%

355, 532, and 1064 nm picosecond laser interaction with grass tissues

Kim

2012

Self Cite

In this article, we investigate how 355, 532, and 1064 nm picosecond lasers interact with grass tissues. We have identified five interaction regimes, and based on this classification, interaction maps have been constructed from a systematic experiment. The optical properties of light absorbing grass constituents are studied theoretically in order to understand how and how much light is absorbed by grass tissues. Scanning electron microscopy and optical microscopy are employed for observing morphological and structural changes of grass tissues. To the best of the authors' knowledge, this is the first investigation into laser interaction with plant leaves and reveals some fundamental findings regarding how a laser interacts with grass tissues and how plant leaves can be processed using lasers.

“…They demonstrate, however, a variety of physical effects that have not been fully understood. There are still debates about ultrafast melting, 1-5 resolidification dynamics, [6][7][8] surface structure modification, 9,10 thermal and nonthermal mechanisms of ablation, 6,[11][12][13][14][15][16][17][18] and direct cluster emission. 16,[19][20][21] This stimulates extensive studies, both experimental and theoretical, of the dynamics of laser heating, melting, resolidification, and ablation of silicon under laser irradiation with different pulse durations and laser wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Insight into electronic mechanisms of nanosecond-laser ablation of silicon

Marine

Bulgakova

Patrone

et al. 2008

To cite this version:Wladimir Marine, N.M. Bulgakova, Lionel Patrone, Igor Ozerov. Insight into electronic mechanisms of nanosecond-laser ablation of silicon. We present experimental and theoretical studies of nanosecond ArF excimer laser desorption and ablation of silicon with insight into material removal mechanisms. The experimental studies involve a comprehensive analysis of the laser-induced plume dynamics and measurements of the charge gained by the target during irradiation time. At low laser fluences, well below the melting threshold, high-energy ions with a narrow energy distribution are observed. When the fluence is increased, a thermal component of the plume is formed superimposing on the nonthermal ions, which are still abundant. The origin of these ions is discussed on the basis of two modeling approaches, thermal and electronic, and we analyze the dynamics of silicon target excitation, heating, melting, and ablation. An electronic model is developed that provides insight into the charge-carrier transport in the target. We demonstrate that, contrary to a commonly accepted opinion, a complete thermalization between the electron and lattice subsystems is not reached during the nanosecond-laser pulse action. Moreover, the charging effects can retard the melting process and have an effect on the overall target behavior and laser-induced plume dynamics.