QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY
Print ISSN : 0288-4771
Basic Study on laser Oscillator and Characteristics of Beam
Study on Materials Processing by High Peak Short Pulse CO2 Laser (Report 1)
Seigo HiramotoMasaharu MoriyasuShozui TakenoMasaki KuzumotoYushi Takenaka
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1992 Volume 10 Issue 4 Pages 458-463

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Abstract

It is very difficult to obtain high quality without cracks and charring by heat affection in the field of materials processing on ceramics or fibre reinforced plastics (FRP) by conventional CO2 laser owing to its low peak power and long pulse duration.
A high peak and rectangular pulse CO2 laser excited by 1 MHz-silent discharge has developed. With the development of a new electrode system utilizing high dielectric constant ceramics plate, homogeneous discharge of power density up to 355 W/cm3 is obtained. An output peak power of 5 kW and pulse duration of 30 to 150 μs in a stable TEM00 mode operation is attained.
A profile of focused beam can be measured by adopting 'Straight Edge Method' and it was made clear that the laser beam has a performance of convergency based on diffraction theory.

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