Investigation of Material Damage.
Interim rept. 15 Dec 75-14 Dec 76,
HONEYWELL CORPORATE RESEARCH CENTER BLOOMINGTON MINN
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This report describes work performed in a continuing program of investigations on the mechanisms by which high power pulsed CO2 laser radiation interacts with target surfaces. The experimental work has been performed using a pulsed CO2 TEA laser capable of delivering up to ten to the 9th power wsq cm to the target surface in a pulse of duration around 100 nanoseconds. Results described in this report include the following 1 Measurement of the pressure pulse induced in target materials by the laser pulse. Measurements were obtained as a function of target material, thickness, ambient air pressure, laser power density, and interpulse time. For metals, a typical value of peak shock pressure is around 100 bars at a laser power density around 1.5 x ten to the 8th powersq cm at 1 atmosphere ambient pressure. For alkali halides, the results can be related to material damage. 2 Characterization of the target surface, by Auger spectroscopy and by measurements of surface scattering to determine the spectral density function. 3 Determination of the fraction of laser energy coupled into the blowoff material as a function of laser power density. 4 COnstruction of apparatus to determine total reflectivity as a function of time during the laser interaction. Author
- Lasers and Masers
- Radioactivity, Radioactive Wastes and Fission Products