Audible acoustic wave emission in excimer laser interaction with materials

Abstract We study the impact of rotation on the hydrodynamic evolution of convective vortices during stellar collapse. Using linear hydrodynamics equations, we study the evolution of the vortices from their initial radii in convective shells down to smaller radii where they are expected to encounter the supernova shock. We find that the evolution of vortices is mainly governed by two effects: the acceleration of infall and the accompanying speed up of rotation. The former effect leads to the radial stretching of vortices, which limits the vortex velocities. The latter effect leads to the angular deformation of vortices in the direction of rotation, amplifying their non-radial velocity. We show that the radial velocities of the vortices are not significantly affected by rotation. We study acoustic wave emission and find that it is not sensitive to rotation. Finally, we analyze the impact of the corotation point and find that it has a small impact on the overall acoustic wave emission.

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Excimer Laser Interaction with Metals

MRS Proceedings ◽

10.1557/proc-285-145 ◽

1992 ◽

Vol 285 ◽

Cited By ~ 3

Author(s):

W.W. Duley ◽

G. Kinsman

Keyword(s):

Experimental Data ◽

Laser Radiation ◽

Excimer Laser ◽

Metal Surfaces ◽

Laser Pulses ◽

Radiative Properties ◽

Uv Laser ◽

Laser Interaction ◽

Excimer Laser Radiation

ABSTRACTExcimer laser radiation may be used to process metal surfaces in a variety of novel ways. The simplest of these involves the use of UV laser pulses for ablation. Ablation occurs as the result of both vaporization and hydrodynamical effects. Experimental data related to these processes will be discussed. In addition, it will be shown how specific irradiation regimes can yield metal surfaces with unique radiative properties.

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Experimental and numerical investigation of heat transfer and phase change phenomena during excimer laser interaction with nickel

International Journal of Heat and Mass Transfer ◽

10.1016/s0017-9310(98)00272-5 ◽

1999 ◽

Vol 42 (8) ◽

pp. 1371-1382 ◽

Cited By ~ 40

Author(s):

X. Xu ◽

G. Chen ◽

K.H. Song

Keyword(s):

Heat Transfer ◽

Phase Change ◽

Numerical Investigation ◽

Excimer Laser ◽

Laser Interaction ◽

Phase Change Phenomena

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Nanosecond-time-resolution thermal emission measurement during pulsed excimer-laser interaction with materials

Applied Physics A ◽

10.1007/s003390050265 ◽

1995 ◽

Vol 62 (1) ◽

pp. 51-59 ◽

Cited By ~ 3

Author(s):

X. Xu ◽

C. P. Grigoropoulos ◽

R. E. Russo

Keyword(s):

Excimer Laser ◽

Time Resolution ◽

Thermal Emission ◽

Emission Measurement ◽

Laser Interaction ◽

Nanosecond Time Resolution

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Acoustic wave monitoring of the excimer laser ablation of YBCO high-Tc superconductor

Applied Physics A ◽

10.1007/s003390100728 ◽

2001 ◽

Vol 73 (3) ◽

pp. 287-294 ◽

Cited By ~ 4

Author(s):

D. Dogas ◽

T. Efthimiopoulos ◽

C. Andreouli ◽

M. Campbell

Keyword(s):

Laser Ablation ◽

Acoustic Wave ◽

Excimer Laser ◽

High Tc ◽

Excimer Laser Ablation ◽

High Tc Superconductor

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Acoustic wave monitoring in pulsed laser interaction with materials

Digest IEEE/Leos 1996 Summer Topical Meeting. Advanced Applications of Lasers in Materials and Processing ◽

10.1109/leosst.1996.540660 ◽

2002 ◽

Author(s):

Y.F. Lu ◽

M.H. Hong ◽

S.J. Chua ◽

T.S. Low

Keyword(s):

Acoustic Wave ◽

Pulsed Laser ◽

Laser Interaction

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AlN Acoustic Wave Sensors Using Excimer Laser Micromachining Techniques

MRS Proceedings ◽

10.1557/proc-639-g11.28 ◽

2000 ◽

Vol 639 ◽

Author(s):

Feng Zhong ◽

Changhe Huang ◽

Gregory W. Auner

Keyword(s):

Acoustic Wave ◽

Excimer Laser ◽

Electromechanical Coupling ◽

Plasma Source ◽

Laser Micromachining ◽

Electromechanical Coupling Coefficient ◽

Thermal Coefficient ◽

Liquid Environment ◽

Excess Loss ◽

Wave Sensors

ABSTRACTAluminum Nitride (AlN) is a promising piezoelectric material for Acoustic Wave (AW) sensor application due to its high acoustic velocity, linear thermal coefficient and high electromechanical coupling coefficient. Epitaxial AlN thin films were successfully grown on the Sapphire C plane substrate by Plasma Source Molecular Beam Epitaxy (PSMBE). Standard two-port resonator structures were fabricated on the AlN/Sapphire by standard photolithography. Excimer laser micromachining techniques were utilized to fabricate microgroove gratings on the surface of thin film. Beside Surface Acoustic Wave (SAW), Surface Transverse Wave (STW) propagation was also found on the devices with those microgroove and classical metal strip gratings. Laser micromachinined microgroove gratings were found to enhance the propagation of STW. Further, sensors based on STW showed little attenuation in the liquid environment, while sensors based on SAW suffered excess loss when exposed to liquid.

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