Science and Technology of Energetic Materials

Vol.66, No.6 (2005)Special Issue for ISEM 2005


Pulse laser ablation of ground glass surface and initiation of PETN powder
Kunihito Nagayama, Yuriko Kotsuka, Motonao Nakahara, and Shiro Kubota


We have studied pulse laser ablation of ground glass surface by focusing a laser pulse through glass plate from rear side. Ablation process has been observed by high speed framing camera. Burst of small fragments of glass has been observed in the present experiment, when ground glass surface is laser ablated. By using ns-duration Nd:YAG laser of around 100 mJ per pulse, observed peak velocity of particle cloud ranges 0.5 km s-1 to 1.5 km s-1.

In order to know the particle generation process, SEM observation of the ground surface in the region of no laser irradiation and also in the damaged region, has been made. It is revealed that virgin glass surface is covered with plenty of micro cracks, while cleavage surface structure has been evidenced in the damaged surface area. We applied the phenomena to ignite PETN powder explosive, and succeeded in igniting PETN powder only by laser ablation of ground glass.

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Laser ablation, Ground glass, High-velocity particle cloud, PETN

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