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High-power laser initiation into detonation of secondary explosives

In order to improve the safety of energetic systems, both in the civil and military domains, detonators containing only secondary explosives have been developed. Some of them are based on optical initiation, to further improve the safety by being immune to electromagnetic environments. These detonators present excellent priming power but are usually slower than their counterparts based on primary explosives. An alternative solution for faster optical initiation would be to use short-pulse high-power lasers. The plasma created by light-matter interaction can indeed generate a shock wave that will propagate inside the target material. It would be interesting to investigate whether this shock can be strong enough for inducing shock to detonation transition in the secondary explosive.
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Ultrafast laser processing : Applications in the mid-IR and THz domains

The main objective of this PhD will be to demonstrate new modalities to enhance the level of controllabity of local laser energy deposition in semiconductors and so their transformations. In particular, the work will explore the introduction of new wavelengths in the mid-infrared and/or THz and strategies based on the temporal shaping of irradiations. The nonlinear processes expected with these approaches should open up new possibilities for tailoring the optical properties inside semiconductor materials (e.g. silicon) and fabricate 3D architectured microdevices.
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