Material ejection in free-running Er:YAG laser ablation of water, liver, and skin

Alfred Vogel*, Bram Kersten, Ingo Apitz

*Corresponding author for this work


We investigated the mechanisms of material ejection in IR laser tissue ablation using free-running Er:YAG laser pulses. We found that for water and soft tissues such as liver the primary mechanism for material ejection is a phase explosion within the target material. The recoil induced by the primary material ejection causes a secondary material expulsion that largely increases the ablation efficiency. For mechanically stronger tissues such as skin, the material ejection is driven by confined boiling, and recoil-induced expulsion plays no role. The high efficiency of recoil-induced material expulsion is associated with a loss in ablation precision and an increase of mechanical side effects that needs to be considered for an appropriate choice of laser parameters.

Original languageEnglish
JournalProceedings of SPIE - The International Society for Optical Engineering
Pages (from-to)40-47
Number of pages8
Publication statusPublished - 27.08.2003
EventPROGRESS IN BIOMEDICAL OPTICS AND IMAGING: Laser-Tissue Interaction XIV - San Jose, United States
Duration: 25.01.200329.01.2003
Conference number: 61888

Research Areas and Centers

  • Academic Focus: Biomedical Engineering


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