Correlation of stress-wave profiles and the dynamics of the plasma produced by laser irradiation of plane solid targets

Krehl, P.; Schwirzke, F.; Cooper, Alfred W.

doi:10.1063/1.321467

Cited by 46 publications

(20 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The areas where they have specially gained importance are: achieving sufficient velocities for compression of inertial confinement fusion target (Labaste et al, 1995;Decoste et al, 1979;Krehl et al, 1975), ultrafast ignition of secondary explosives (Asay et al, 1990;Bourne, 2001), measurement of equation of state (EOS) and high pressure induced phase transitions (Swift, 2002), measurement of dynamic spall strength of various metals (O'Keefe & Skeen, 1972;Okada et al, 2003;Robbins & Sheffield, 2000;Paisley et al, 2001;Wang 2002;Watson et al, 2000). In one of the experiments, X-ray driven flyers have been used to generate EOS data in the pressure regime of 0.75 Gbar (Cauble et al, 1993).…”

Section: Inroductionmentioning

confidence: 99%

Laser produced thin metallic planar mini-flyer generation using fiber optic plate

et al. 2013

View full text Add to dashboard Cite

Laser produced planar mini flyer generation has widely gained importance owing to its wide ranging applications in the field of condensed matter, astrophysics, material research, shock phenomenon, etc. Flattop smooth laser beam profile as driver is the primary requirement for planar flyer generation besides special multilayered target geometry. We present here laser produced thin metallic planar mini-flyer generation using a fiber optic plate (FOP) of 8 mm thickness and about 6 μm fiber dimension. This technique is unique in the sense that it doesn't require large length as compared to optical fiber. A Gaussian shape laser beam from a laser oscillator was allowed to fall on the FOP generating a speckle pattern. This pattern was relayed and amplified using lenses and laser amplifiers to achieve energy of about 400 mJ. The beam was focused on a substrate (fused silica) based multilayered target on which flyer disks of different materials such as Al. Cu, Br, and Ta were attached. Velocities as high as 400 m/s was measured for Al flyer of 1.5 mm diameter and thickness 50 μm. Flyer disks were completely recovered after the laser shot. We also present a theoretical analysis along with experimental results of the laser beam smoothing technique using a He-Ne laser and FOP. Each channel of the FOP acts as a small single mode optical fiber. The basic idea was to divide the incoming coherent beam into many beam-lets introducing random distribution in length or/and diameter of optical fibers of FOP. The individual FOP channel acts as a diverging source because of single mode fiber with natural divergence λ/d. However, due to the small randomness in length or diameter, the individual diffraction sources are not in phase. This results in the generation of speckles in both near (Fresnel) and far field (Fraunhoffer) destroys the spatial coherence of the beam.

show abstract

Section: Inroductionmentioning

confidence: 99%

Laser produced thin metallic planar mini-flyer generation using fiber optic plate

et al. 2013

View full text Add to dashboard Cite

show abstract

“…A number of methods can be used for real-time diagnostic of beam material interaction, e. g. control of weld quality by acoustic emission [lJ, recording of stress pulses [2] and thermally-generated elastic waves during laser irradiation [3].…”

Section: Introductionmentioning

confidence: 99%

Prediction of weld data using process control based on surface temperature measurement for high-power energy flow processes

Brueggemann

Benziger

1996

SPIE Proceedings

View full text Add to dashboard Cite

The main aim of this article is to obtain the correlation between the thermal cycle and the mechanical properties in the weld seam and the heat-affected zone of mild and stainless steels. Key targeted process is welding using electron beam, laser and plasma. Since these processes are characterised by high heating and cooling rates, wide temperature range, small heat affected zones, they are difficult to control and automize. As a consequence, the quality of the product varies over a large range. Because either temperature measurement on one spot or quasi steady-state surface temperature distribution in a large area are generally unsuitable, temperature gradients need to be controlled directly on-line with a high accuracy. This requires the use of a two dimensional temperature control. An infrared camera system can be used in order to investigate the cooling process in the weld seam area as well as in the heat affected zone. On the one hand the aim of the experimentsis the estimation of the microstructure, especially of the hardness distribution using welding-time-temperature-conversiondiagrams and equations of regression. On the other hand the observation of the cooling cycle allows trends of mechanical properties like stretch limit, tensile strength, breaking elongation to be predicted. Simultaneously it is possible to recognize and to localize pores, voids and bonding defects, losses in penetration, problems with gap and height, appearing during the cooling ofthe weld.

show abstract

“…The amplitude of the driving force can be estimated using an expression similar to Eq. (13), whereas the time profile of generated stress pulse is the subject of experimental study (Krehl, Schwirzke et al 1975). Laser plasmas formation and their interaction with the surface is very complex and multi-variable problem, which can only be solved in the framework of some model assumption (Mora 1982).…”

Section: Thermal and Plasma Driven Acoustic Waves In Metal Foilsmentioning

confidence: 99%

Molecular Desorption by Laser–Driven Acoustic Waves: Analytical Applications and Physical Mechanisms

Zinovev¹,

Veryovkin²,

Pellin³

2011

Acoustic Waves - From Microdevices to Helioseismology

View full text Add to dashboard Cite

Correlation of stress-wave profiles and the dynamics of the plasma produced by laser irradiation of plane solid targets

Cited by 46 publications

References 5 publications

Laser produced thin metallic planar mini-flyer generation using fiber optic plate

Laser produced thin metallic planar mini-flyer generation using fiber optic plate

Prediction of weld data using process control based on surface temperature measurement for high-power energy flow processes

Molecular Desorption by Laser–Driven Acoustic Waves: Analytical Applications and Physical Mechanisms

Contact Info

Product

Resources

About