Numerical study of spatial propagation dynamics and energy delivery of TW square-aperture CO₂ laser pulses in the atmosphere

2021 ◽  
Author(s):  
Paris Panagiotopoulos ◽  
Miroslav Kolesik ◽  
Victor Hasson ◽  
Sergei Tochitsky ◽  
Jerome Moloney
Keyword(s):  
Numerical Study ◽  
Laser Pulses ◽  
Co Laser ◽  
Energy Delivery ◽  
Spatial Propagation ◽  
Propagation Dynamics

Temporal Pulse Shaping and Optimization in Ultrafast Laser Ablation of Materials

2003 ◽  
Vol 780 ◽  
Author(s):  
R. Stoian ◽  
S. Winkler ◽  
M. Hildebrand ◽  
M. Boyle ◽  
A. Thoss ◽  
...  
Keyword(s):  
Pulse Shaping ◽  
Laser Energy ◽  
Energy Coupling ◽  
Laser Pulses ◽  
Ultrafast Laser ◽  
Ultrashort Laser Pulses ◽  
Adaptive Optimization ◽  
Ultrafast Laser Pulses ◽  
Energy Delivery ◽  
Optimal Processing

The possibility of phase manipulation and temporal tailoring of ultrashort laser pulses enables new opportunities for optimal processing of materials. Phase-manipulated ultrafast laser pulses allow adapting the laser energy delivery rate to the material properties for optimal processing laying the groundwork for adaptive optimization in materials structuring. Different materials respond with specific reaction pathways to the sudden energy input depending on the efficiency of electron generation and on the ability to release the energy into the lattice. The sequential energy delivery with judiciously chosen pulse trains may induce softening of the material during the initial steps of excitation and change the energy coupling for the subsequent steps. We show that this can result in lower stress, cleaner structures, and allow for a materialdependent optimization process.

scholarly journals Experimental and numerical study of ultra-short laser-produced collimated Cu Kα X-ray source

2017 ◽  
Vol 35 (3) ◽  
pp. 442-449 ◽  
Author(s):  
R. Rathore ◽  
V. Arora ◽  
H. Singhal ◽  
T. Mandal ◽  
J.A. Chakera ◽  
...  
Keyword(s):  
Laser Intensity ◽  
Numerical Study ◽  
Low Cost ◽  
Laser Pulses ◽  
Photon Flux ◽  
X Rays ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Short Laser Pulses

AbstractKα X-ray sources generated from the interaction of ultra-short laser pulses with solids are compact and low-cost source of ultra-short quasi-monochromatic X-rays compared with synchrotron radiation source. Development of collimated ultra-short Kα X-ray source by the interaction of 45 fs Ti:sapphire laser pulse with Cu wire target is presented in this paper. A study of the Kα source with laser parameters such as energy and pulse duration was carried out. The observed Kα X-ray photon flux was ~2.7 × 108 photons/shot at the laser intensity of ~2.8 × 1017 W cm−2. A model was developed to analyze the observed results. The Kα radiation was coupled to a polycapillary collimator to generate a collimated low divergence (0.8 mrad) X-ray beam. Such sources are useful for time-resolved X-ray diffraction and imaging studies.

Superposition of nuclear states in multi-lambda systems using x-ray laser pulses

2021 ◽  
Author(s):  
Nasim Mansourzadeh-Ashkani ◽  
Maghsoud Saadati-Niari ◽  
Farhad Zolfagharpour ◽  
Bashir Nedaee-Shakarab
Keyword(s):  
Excited States ◽  
Gamma Rays ◽  
Numerical Study ◽  
Ground States ◽  
Laser Pulses ◽  
Population Transfer ◽  
Adiabatic Passage ◽  
X Ray ◽  
Ideal Situation ◽  
The Ideal

Abstract Nuclear-state population transfer in the multi-lambda systems with N = 5 that interact with four X-ray laser pulses are investigated theoretically. By using the coincident pulses and stimulated Raman adiabatic passage (STIRAP) techniques, the population transfer from one initially populated ground state to an arbitrary coherent superposition of other ground states. Since the frequency of currently available X-ray lasers is lower than the gamma rays, in this method, X-ray laser pulses with different frequencies are interacting with the accelerated nuclei. We employ the Morris-Shore (MS) transformation to reduce the five-states system to two separate three-state and two-state linkage. The required laser intensities were calculated, which satisfy the conditions of coincident pulses and multi-lambda STIRAP techniques. Considering the spontaneous emission from excited states, the master equation has to be used for numerical study, and it is shown that an arbitrary superposition of final ground states can be obtained. Also, it is observed that by increasing the number of coincident pulses, the population of ground states gets closer to the ideal situation.

Propagation dynamics of nonlinear chirped optical laser pulses in a two-level medium

2012 ◽  
Vol 10 (1) ◽  
pp. 011901-11903 ◽  
Author(s):  
Haifeng Yao Haifeng Yao ◽  
Yueping Niu Yueping Niu ◽  
Yandong Peng Yandong Peng ◽  
Shangqing Gong Shangqing Gong
Keyword(s):  
Laser Pulses ◽  
Propagation Dynamics ◽  
Level Medium ◽  
Optical Laser

Numerical study on prolonging lifetime of plasma channels generated by ultra-short laser pulses

2013 ◽  
Vol 25 (4) ◽  
pp. 813-816 ◽  
Author(s):  
陈文 Chen Wen ◽  
范承玉 Fan Chengyu ◽  
王海涛 Wang Haitao ◽  
张鹏飞 Zhang Pengfei ◽  
张京会 Zhang Jinghui ◽  
...  
Keyword(s):  
Numerical Study ◽  
Laser Pulses ◽  
Plasma Channels ◽  
Short Laser Pulses

scholarly journals Modeling the spatial propagation of Aβ oligomers in Alzheimer’s Disease

2020 ◽  
Vol 67 ◽  
pp. 30-45
Author(s):  
Martin Andrade-Restrepo ◽  
Paul Lemarre ◽  
Laurent Pujo-Menjouet ◽  
Leon Matar Tine ◽  
Sorin Ionel Ciuperca
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Numerical Study ◽  
Spatial Dynamics ◽  
Amyloid Formation ◽  
Protein Assemblies ◽  
Neurotoxic Effect ◽  
Aβ Oligomers ◽  
Spatial Propagation

Recent advances in the study of Alzheimer’s Disease and the role of Aβ amyloid formation have caused the focus of biologists to progressively shift towards the smaller protein assemblies, the oligomers. These appear very early on in the disease progression and they seem to be the most infectious species for the neurons. We suggest a model of spatial propagation of Aβ oligomers in the vicinity of a few neurons, without considering the formation of large fibrils or plaques. We also include a simple representation of the oligomers neurotoxic effect. A numerical study reveals that the oligomers spatial dynamics are very sensitive to the balance between their diffusion and their replication, and that the outcome in terms of the progression of AD strongly depends on it.

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