Improved prediction of ultrashort pulse laser ablation efficiency

作者：David Redka, Sergio Vela, Maximilian Spellauge, J. Minář, M. Morales, C. Molpeceres, H. Huber · 发表于：Optics & Laser Technology · 年份：2025 · DOI：10.1016/j.optlastec.2025.113103 · 被引用次数：9 · 研究领域：Laser Material Processing Techniques、Ocular and Laser Science Research、Laser-induced spectroscopy and plasma

• Introduced a threshold-refined ablation model (TRM), which allows for an improved prediction for the ablation efficiency. • The TRM incorporates a minimum ablation depth d 0 to reconcile differences between D ² and ablation depth thresholds. • Maximum ablation efficiency now occurs at a fluence dependent on the d 0 /d eff ratio ( d eff is effective penetration depth). • For d 0 / d eff ≈ 1, the ablation efficiency maximum occurs at fluences between 3 and 5 times the threshold fluence.The TRM shows improved accuracy over existing models for metals, semiconductors, and dielectrics. Achieving maximum efficiency and precision in ultrafast laser ablation is crucial for micromachining applications, where advanced models are pivotal to predict and optimize laser-material interactions. Existing models for predicting laser ablation efficiency assume an equivalence between the threshold fluence determined by ablation depth and diameter. However, experimental measurements have shown this assumption does not hold. In this work, we present a new model for ablation efficiency by introducing a minimum ablation depth ( d 0 ) into the ablation depth equation, which accounts for the discrepancy between depth and diameter thresholds. We have designated this framework as the threshold-refined ablation model (TRM). Unlike the Furmanski model, which places the fluence corresponding to maximum ablation efficiency at e 2 times the threshold fluence, the TRM predicts this maximum occurs at a lower ...