Optimizing energy absorption for ultrashort pulse laser ablation of fused silica
2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)(2016)
摘要
We investigate the ultrafast absorption of fused silica irradiated by a single 500 fs laser pulse in the context of micromachining applications. As the absorption of the laser energy is rapid (~fs), the optical properties of the material evolve during the laser pulse, thereby yielding a feedback on the dynamics of absorption and consequently on the amount of energy that is absorbed. Through complete investigation of energy absorption, by combining “pump depletion” and “pump-probe” experiments in a wide range of incident fluences above the ablation threshold, we demonstrate the existence of an optimal fluence range, enabling to turn transiently the material into a state such that each photon is optimally utilized for ablation.
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关键词
Ultrashort Laser-matter Interaction,Dielectric Materials,Ablation
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