Sub-micrometer and nanoscale imprinting on large-area foils using high-pressure underwater shock waves

The two-phase model of vapor-gas-liquid medium in axisymmetric two-dimensional formulation, taking into account vaporization is constructed. The nonstationary processes of boiling vapor-water mixture outflow from high-pressure vessels as a result of depressurization are studied. The problems of shock waves action on filled by gas-liquid mixture volumes are solved.

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Equation of state studies at SILP by laser-driven shock waves

Laser and Particle Beams ◽

10.1017/s0263034600009915 ◽

1996 ◽

Vol 14 (2) ◽

pp. 157-169 ◽

Cited By ~ 8

Author(s):

Yuan Gu ◽

Sizu Fu ◽

Jiang Wu ◽

Songyu Yu ◽

Yuanlong Ni ◽

...

Keyword(s):

Shock Wave ◽

High Pressure ◽

Equation Of State ◽

Shock Waves ◽

Target Surface ◽

Shock Adiabats ◽

Pressure Shock ◽

Aluminum Target ◽

Laser Illumination ◽

The Stability

The experimental progress of laser equation of state (EOS) studies at Shanghai Institute of Laser Plasma (SILP) is discussed in this paper. With a unique focal system, the uniformity of the laser illumination on the target surface is improved and a laser-driven shock wave with good spatial planarity is obtained. With an inclined aluminum target plane, the stability of shock waves are studied, and the corresponding thickness range of the target of laser-driven shock waves propagating steadily are given. The shock adiabats of Cu, Fe, SiO2 are experimentally measured. The pressure in the material is heightened remarkably with the flyer increasing pressure, and the effect of the increasing pressure is observed. Also, the high-pressure shock wave is produced and recorded in the experimentation of indirect laser-driven shock waves with the hohlraum target.

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LASER‐INDUCED HIGH‐PRESSURE SHOCK WAVES IN WATER

Applied Physics Letters ◽

10.1063/1.1754840 ◽

1967 ◽

Vol 10 (2) ◽

pp. 46-48 ◽

Cited By ~ 116

Author(s):

C. E. Bell ◽

J. A. Landt

Keyword(s):

High Pressure ◽

Shock Waves ◽

Pressure Shock

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Study of Ho:YAG Laser Generated Underwater Shock Waves and Cavity Bubble for Revascularization Therapy

10.1115/imece2000-2570 ◽

2000 ◽

Author(s):

S. H. R. Hosseini ◽

T. Hirano ◽

O. Onodera ◽

K. Takayama

Keyword(s):

Shock Wave ◽

Shock Waves ◽

Optical Fiber ◽

Optical Fibers ◽

Early Stage ◽

Underwater Shock Wave ◽

Ho:Yag Laser ◽

Direct Laser ◽

Order Of Magnitude ◽

Underwater Shock

Abstract For applying shock waves to precise medical procedures like neurosurgery, a reliable generation of micro shock waves is required. Such sensitive applications make limits on usage of conventional underwater shock wave sources like Extracoporeal Shock Waves ESW [1] or micro explosives [2]. In the present study a Q-switched Ho:YAG laser and an optical fiber are used. Advantages of this method over previous shock wave sources are two order of magnitude reduction in focusing area if compared with ESW and elimination of product gases of micro explosives. Nakahara and Nagayama [3] studied underwater shock waves emanated from surface of an optical fiber by pulse Nd:YAG laser input using shadowgraph technique. Their qualitative study limited to visualization of shock waves at its early stage. The present research aims to clarify quantitatively process of the shock wave generation by direct laser beam irradiation through optical fibers, growth and behavior of generated cavities, and structure of heat induced flow in front of the optical fiber.

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