Mr. Yunpeng Wang Profile

Yunpeng Wang

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Proceedings Article | 22 December 2022 Paper

Numerical simulation of the expansion velocity of laser-induced plasma generated in transparent materials

Jixing Cai, Congrui Geng, Hongtao Mao, Hao Yu, Yunpeng Wang

Proceedings Volume 12459, 124590E (2022) https://doi.org/10.1117/12.2656290

KEYWORDS: Combustion, Plasma, Pulsed laser operation, Absorption, Laser processing, Laser applications, Wave propagation, Optical simulations, Laser energy, Light

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In the high power laser system, because of the high power of the laser, it is likely to cause damage to the laser devices, making the laser system paralyzed. When a certain high-intensity laser passes through an optical device, part of the energy is absorbed by the device to form physical processes such as ablation, melting and gasification of the material surface. The vaporized target vapor continuously absorbs the laser energy to form an absorption wave maintained by the laser. According to different mechanisms and characteristics, it can be divided into detonation wave and combustion wave. The research on the generation process, mechanism and characteristics of laser supported absorption wave is helpful to the design optimization of laser devices and increase the understanding of the basic physical process of absorption wave. In this paper, the physical process and characteristics of combustion wave induced by long pulse millisecond laser in two transparent materials quartz are studied. In this paper, the process of combustion wave generation is described from a more complete theoretical point of view. First, the process of laser incident on the target to generate combustion wave is described in a more complete theoretical way. Then, the physical characteristics of combustion wave under different parameters, such as the size distribution of expansion velocity, the size distribution of expansion velocity, the generation of combustion wave induced by laser, are obtained through the establishment and Simulation of the combustion wave model Fluid fraction evolution state, etc.

Proceedings Article | 22 December 2022 Paper

Research on plasma characteristics of fused silica induced by millisecond pulsed laser

Jixing Cai, Zequn Zhang, Hao Yu, Yunpeng Wang, Hongtao Mao

Proceedings Volume 12459, 124590O (2022) https://doi.org/10.1117/12.2656288

KEYWORDS: Combustion, Pulsed laser operation, Plasma, Wave propagation, Laser energy, Silica, Optical components, Laser irradiation, Optical simulations, Temperature metrology

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With the continuous development of optoelectronics science, the widespread and intensive application of transparent optical elements has become an indispensable condition for the development of information technology in society. Transparent optical elements under the action of strong laser light are prone to produce plasma and even then cause damage to the elements. Therefore, it is important to study the process of interaction between transparent optical elements and strong laser light and its results. In this paper, a theoretical research and simulation study is conducted to investigate the characteristics of 1064 nm millisecond pulsed laser induced plasma generation in transparent optical elements represented by fused silica. It is demonstrated that the plasma propagation velocity and the temperature of each part increase with the increase of laser energy density during the interaction between the millisecond pulsed laser and the transparent optical elements; the plasma propagation velocity tends to increase and then decrease with the increasing of laser action time, and the temperature continues to increase near the threshold value；The plasma propagation velocity increases with the increasing of laser pulse width, and the velocity variation pattern is similar in all pulse widths; the temperature increases with the increasing of laser pulse width and approaches the temperature threshold that can be reached by the combustion wave generated by the interaction between the millisecond pulsed laser and fused silica. Finally, the kinetic characteristics and temperature rise phenomenon of the plasma propagation generated during the interaction between the millisecond pulsed laser and the transparent optical element are explained.

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