Stabilization of laser-induced plasma in bulk water using large focusing angle

Tian, Ye; Xue, Boyang; Song, Junfeng; Lu, Yuan; Zheng, Ronger

doi:10.1063/1.4960711

Cited by 54 publications

(28 citation statements)

References 27 publications

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“…The generation of shock waves in liquids by laser is often made difficult by the need of using long focal lenses to access the bulk of the liquid, a fact which may lead to the creation of elongated, quasi-cylindrical shock waves [73] as the one depicted schematically in Figure 1. When the laser energy can be delivered successfully in a single spot, spherical shock waves can be created that behaves as micro-bubbles in the liquid.…”

Section: Shock Waves In Liquidsmentioning

confidence: 99%

Shock Waves in Laser-Induced Plasmas

Campanella

Legnaioli

Pagnotta

et al. 2019

Atoms

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The production of a plasma by a pulsed laser beam in solids, liquids or gas is often associated with the generation of a strong shock wave, which can be studied and interpreted in the framework of the theory of strong explosion. In this review, we will briefly present a theoretical interpretation of the physical mechanisms of laser-generated shock waves. After that, we will discuss how the study of the dynamics of the laser-induced shock wave can be used for obtaining useful information about the laser-target interaction (for example, the energy delivered by the laser on the target material) or on the physical properties of the target itself (hardness). Finally, we will focus the discussion on how the laser-induced shock wave can be exploited in analytical applications of Laser-Induced Plasmas as, for example, in Double-Pulse Laser-Induced Breakdown Spectroscopy experiments.

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Section: Shock Waves In Liquidsmentioning

confidence: 99%

Shock Waves in Laser-Induced Plasmas

Campanella

Legnaioli

Pagnotta

et al. 2019

Atoms

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“…There are many ways to reduce the spherical aberration, such as using the doublet lens or the combination of two single lens. As shown in our previous work [ 29 , 30 ], the application of a doublet lens together with a large focusing angle can greatly improve the stability of the plasma and lead to high-quality LIBS signals. However, in the practical case, there is a certain safety risk because the doublet lens may be damaged by the high-energy laser pulse.…”

Section: Methodsmentioning

confidence: 95%

Development and Field Tests of a Deep-Sea Laser-Induced Breakdown Spectroscopy (LIBS) System for Solid Sample Analysis in Seawater

Liu

Guo

Tian

et al. 2020

Sensors

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In recent years, the investigation and exploitation of hydrothermal region and polymetallic mineral areas has become a hot topic. The emergence of underwater vehicle platforms has made it possible for new chemical sensors to be applied in marine in-situ detection. Laser-induced breakdown spectroscopy (LIBS), with its advantages of rapid real-time analysis, sampling without pretreatment, simultaneous multi-element detection and stand-off detection, has great potential in marine applications. In this paper, a newly more compact and lighter underwater LIBS system based on the LIBSea system named LIBSea II was developed and tested both in the laboratory and sea trials. The system consists of a Nd:YAG single-pulse laser at 1064 nm, a fiber spectrometer, optical layout, a power supply module and an internal environment sensor. The system is encapsulated in a pressure vessel (Φ 190 mm × L 588 mm) with an optical window on the end cap. Experimental parameters of the system including laser energy and delay time were firstly optimized in the laboratory. Then, field test of the system in nearshore was performed with various samples, including pure metal and alloy samples as well as a manganese nodule sample from deep sea, to verify the detection performance of the LIBSea II system. In 2019, the system was deployed on a remotely operated vehicle (ROV) of Haima for deep sea trial, and atomic lines of K, Na, Ca and strong molecular bands of CaOH from a carbonate rock sample were obtained for the first time at depths of 1400 m. These results show that the LIBSea II system has great potential to be used in deep-sea geological exploration.

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“…The distortion might result in a transient larger or smaller focusing angle. The focusing angle could affect the shape of the laser-induced plasma (Tian et al 2016;Vogel et al 1996), and the shape and dynamics of the cavitation bubble (Sinibaldi et al 2019). The wrinkled surface also affected the interaction between the bubble and the surface, as it is known that shape of the surface affects the bubble and breakup dynamics (Obreschkow et al 2006).…”

Section: A Statistical Methods To Describe Breakupmentioning

confidence: 99%

An analysis of surface breakup induced by laser-generated cavitation bubbles in a turbulent liquid jet

Zhou

Andersson

2020

Exp Fluids

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The breakup of turbulent liquid jets by cavitation bubbles was investigated by artificially introducing them by focusing laser light into the jet. The induced surface deformations and ejected liquid structures were characterized using shadowgraphy with a high-speed video camera. The flow velocity of the liquid jets, which were ejected from a 6 mm nozzle, was varied by adjusting the injection pressure from 1 to 5 bar. Deionized water and a dipropylene glycol–water mixture were used to compare the breakup of liquid jets with different surface tension and viscosity. Surface deformation and breakup were found to occur in two stages. One was early breakup of liquid strings into tiny droplets. This was followed by the formation of a larger structure separating into ligaments and larger drops. Averaged time-resolved one-dimensional plots were introduced and implemented to analyze breakup statistically, to address the problem of shot-to-shot variations in the breakup due to the turbulent condition of the jets. Bubble-induced breakup could easily be distinguished from spontaneous breakup with this method. Both the position of bubble formation and the injection pressure had an influence on the scale of the breakup. The deformation of the jet surface was highly affected by shear. The structure of the deformation became less intact when the surface tension was lower. The sizes of the drops produced during the second stage of breakup were analyzed. The bubble-induced breakup produced smaller drops than the spontaneous breakup at lower injection pressure. As expected, lower surface tension favored droplet detachment and smaller sized drops. Graphic abstract

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Stabilization of laser-induced plasma in bulk water using large focusing angle

Cited by 54 publications

References 27 publications

Shock Waves in Laser-Induced Plasmas

Shock Waves in Laser-Induced Plasmas

Development and Field Tests of a Deep-Sea Laser-Induced Breakdown Spectroscopy (LIBS) System for Solid Sample Analysis in Seawater

An analysis of surface breakup induced by laser-generated cavitation bubbles in a turbulent liquid jet

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