GHz femtosecond processing with agile high-power laser

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Eric Audouard ◽  
Guillaume Bonamis ◽  
Clemens Hönninger ◽  
Eric Mottay
Keyword(s):  
High Power ◽  
Repetition Rate ◽  
Thermal Ablation ◽  
Femtosecond Lasers ◽  
Optimal Choice ◽  
Process Conditions ◽  
High Power Laser ◽  
Power Laser ◽  
Ablation Efficiency ◽  
High Power Lasers

Abstract Bursts of GHz repetition rate pulses can significantly improve the ablation efficiency of femtosecond lasers. Depending on the process conditions, thermal mechanisms can be promoted and controlled. GHz ablation therefore combines thermal and non-thermal ablation mechanisms. With an optimal choice of the burst duration, the non-thermal ablation can be highly enhanced by a heating phase due to the first pulses in the burst. The GHz burst mode can be considered as a key function for the “agility” of new high-power lasers.

Nd:Phosphate Split-Slab Liquid Cooled kJ Amplifier for High Power Laser at High Repetition Rate

2020 ◽  
Author(s):  
P.M. Dalbiès ◽  
N. Blanchot ◽  
E. Bordenave ◽  
B. Cadilhon ◽  
S. Cavaro ◽  
...  
Keyword(s):  
High Power ◽  
Repetition Rate ◽  
High Repetition Rate ◽  
High Power Laser ◽  
Power Laser ◽  
High Repetition

Research Progress of High Repetition Rate and High Power Laser with SBS-Phase Conjugate Mirror

2014 ◽  
Vol 51 (4) ◽  
pp. 040001
Author(s):  
Wang Haocheng ◽  
Fan Zhongwei ◽  
Yu Jin ◽  
Kang Zhijun ◽  
Ge Wenqi ◽  
...  
Keyword(s):  
High Power ◽  
Repetition Rate ◽  
High Repetition Rate ◽  
Research Progress ◽  
High Power Laser ◽  
Power Laser ◽  
Phase Conjugate ◽  
High Repetition ◽  
Phase Conjugate Mirror

scholarly journals Nucleation under the impact of pulsed laser radiation

2021 ◽  
Vol 34 (06) ◽  
pp. 1785-1792
Author(s):  
Sergey Nikoloaevich Maksimovsky ◽  
Aleksey Urievich Stavtsev
Keyword(s):  
Laser Radiation ◽  
Gas Phase ◽  
High Power ◽  
High Pressures ◽  
Process Conditions ◽  
Extended Model ◽  
High Power Laser ◽  
Power Laser ◽  
The Impact ◽  
High Power Laser Radiation

The article shows theoretical calculations of nucleation in nonequilibrium conditions under the impact of high-power laser radiation, and their experimental confirmation. The phase transition during homogeneous nucleation without seed in the gas phase has long been studied by various scientists in the developed countries of the world. Several nucleation theories have been developed, however, they are difficult or impossible to apply to fast-flowing crystallization processes occurring at high pressures and temperatures that take place when using high-power laser radiation in the gas phase. In this article, an extended model of nucleation in the gas phase is developed using traditional thermodynamic concepts, as well as the influence of the process conditions on the equilibrium concentration and the formed particle size within the range from 100 nm to 1 micron is predicted. The article describes experiments on growing structures on plastic substrates containing inside optical inhomogeneities in the form of diffraction gratings. The calculation of the sublimation evaporation pressures of aluminum is conducted depending on different laser radiation power densities. The authors obtained images of nascent structures by electron microscopy and demonstrated the possibility of observing the nucleation phases in situ by changing the power of laser radiation of the sample.

scholarly journals High-power laser beam shaping using apodized apertures

1990 ◽  
Vol 8 (1-2) ◽  
pp. 349-360 ◽  
Author(s):  
S. G. Lukishova ◽  
P. P. Pashinin ◽  
S. Kh. Batygov ◽  
V. A. Arkhangelskaya ◽  
A. E. Poletimov ◽  
...  
Keyword(s):  
Laser Beam ◽  
High Power ◽  
Fresnel Diffraction ◽  
Beam Shaping ◽  
High Power Laser ◽  
Laser Beam Shaping ◽  
Power Laser ◽  
High Power Lasers ◽  
Uv Visible

This paper gives the results of the investigations of four types of apodized (soft) apertures for beam shaping of UV, visible and IR high-power lasers with near-Gaussian and flat-top transmittance. The apodized apertures (AA) are ≈3–45 mm in diameter, but the principles of fabrication of such apertures lends the possibility of apodizing beams with diameter <1 mm and >200 mm. The examples of studies of the AA in high-power lasers are presented. The possibility of avoiding the Fresnel diffraction ripples is proved experimentally.

scholarly journals High-power laser-produced plasmas and astrophysics

1991 ◽  
Vol 9 (4) ◽  
pp. 869-879 ◽  
Author(s):  
S. J. Rose
Keyword(s):  
High Power ◽  
Intense Laser ◽  
High Power Laser ◽  
Power Laser ◽  
Astrophysical Plasmas ◽  
High Power Lasers ◽  
X Ray ◽  
Line Identification ◽  
Matter Interaction ◽  
Radiative Opacity

The temperatures and the densities of plasmas produced by high-power lasers vary widely but in certain cases are similar to those found in astrophysical plasmas. In recent years our understanding of intense laser–matter interaction and the evolution of the resultingplasma has increased to the point where experiments can be designed to produce plasmas that allow astrophysical models to be tested. In this paper I review experimental work on laser-produced plasmas that is relevant to astrophysics. In the fields of highlyionized ion line identification and radiative opacity, relevant measurements have already been performed. Other experiments that could be performed with current laser facilities, including studies of X-ray nebula plasmas and complex radiation line transport, are described. In addition, experiments to investigate plasmas under more extreme conditions, which may be achievable with more powerful lasers, are mentioned.

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