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arXiv · 2209.06431

Plasma free bubble cavitation in water by a 2.9 {\mu}m laser for bioprinting applications

Shubho Mohajan·Jean-Christophe Delagnes·Baptiste Allisy·Antonio Iazzolino·Bertrand Viellerobe·Stéphane Petit
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Abstract

We investigate the dynamics of the cavitation bubble induced by 2.9 {\mu}m mid-IR laser pulses (10 ns, 10-50 {\mu}J) resulting in a plasma-free direct fast heating of water due to a strong vibrational absorption. We establish a direct correlation between the laser fluence (up to 6 J/cm^2) and the maximum bubble radius (up to 200 {\mu}m). From experimental data, key parameters (threshold energy, internal pressure) can be retrieved by simulations including the water absorption saturation at 2.9 {\mu}m. At a fluence of 6 J/cm^2, we obtain 13 % of the laser energy converted to a bubble energy and we can predict that operating at higher fluence >10 J/cm^2 will lead to a maximum of 20 % conversion efficiency. This results open the door to bioprinting applications using direct absorption of the laser radiation without any additional absorber.

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Shubho Mohajan, Jean-Christophe Delagnes, Baptiste Allisy, Antonio Iazzolino, Bertrand Viellerobe, Stéphane Petit. 2022-09-14. Plasma free bubble cavitation in water by a 2.9 {\mu}m laser for bioprinting applications. https://doi.org/10.1063/5.0126355

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