High Speed Cinematographic Investigations Of The Interaction Of Pulsed Laser Radiation With Liquids

Manfred Hugenschmidt; Joseph Wey; Werner Baca

doi:10.1117/12.967783

1 March 1983 High Speed Cinematographic Investigations Of The Interaction Of Pulsed Laser Radiation With Liquids

Manfred Hugenschmidt, Joseph Wey, Werner Baca

Proceedings Volume 0348, 15th Intl Congress on High Speed Photography and Photonics; (1983) https://doi.org/10.1117/12.967783
Event: 15th International Congress on High Speed Photography and Photonics, 1982, San Diego, United States

Abstract

With regard to scientific research and technical applications considerable work has been done for many years in studying the interaction of high power laser radiation with matter in the gaseous, liquid or condensed phase. The present paper is concerned with recent investigations of the impact of powerful CO2 laser pulses on liquid targets. Pulse energies are in the range of several tens of J at power densities up to several 108W/cm2. The absorption of the laser radiation in a thin surface layer leads to rapid heating and vaporization and above certain threshold intensities to the formation of strongly ionized plasmas. In this case high pressures are building up causing even large amounts of liquid material to be ejected. The pressures were determined quantitatively by means of quartz gages. In order to determine the influence of frictional forces two liquids that is water and polyethylene glycol, were investigated at energy densities ranging from about 3 to 15 J/cm4. High-speed cinematographic techniques were used for visualizing these transient phenomena and for obtaining quantitative information on the velocities of the plasma expansion, the vapor clouds, the shockwaves propagating inside the liquids and the ejection of liquid jets or droplets. A rotating-mirror streak camera and a multiple spark camera was operated at the same time. Their recordings could thus be correlated to the laser parameters (energy and power) and to the laser induced pressures that were obtained simultaneously in each shot.

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Manfred Hugenschmidt, Joseph Wey, and Werner Baca "High Speed Cinematographic Investigations Of The Interaction Of Pulsed Laser Radiation With Liquids", Proc. SPIE 0348, 15th Intl Congress on High Speed Photography and Photonics, (1 March 1983); https://doi.org/10.1117/12.967783

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KEYWORDS

Liquids

Plasmas

Quartz

Absorption

Mirrors

Carbon dioxide lasers

Transducers

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