Er:YAG laser ablation was investigated by fast photography in a Schlieren optic setup. The results support the idea of continuous, thermally driven microexplosion type of ablation, which is based on the inhomogeneous distribution of strong (water) and weak absorbers (hydroxyapatite). Sudden vaporization and heating of the water content leads to a very effective material removal by bursting off the solid tissue components. Material is ejected in the form of particles when the threshold energy density for ablation (about 3 J cm$+$MIN@2$/) is reached. For high radiant exposure, initial plume velocity is in the order of the speed of sound in air. After leaving the tissue surface, particles are heated by the still incoming laser radiation, causing glowing and melting. No surface plasma and only weak pressure waves caused by individual spikes were observed.
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机译：ER：通过快速摄影在Schlieren视镜设置中研究了YAG激光烧蚀。结果支持连续，热驱动的微爆炸型消融的思想，这是基于强（水）和弱吸收剂（羟基磷灰石）的不均匀分布。含水含量的突然蒸发和加热通过突出固体组织成分而导致非常有效的材料去除。当达到用于消融的阈值能量密度（达到约3Jcm $ + $ min @ 2 $ /）时，材料以粒子的形式喷射。对于高辐射曝光，初始羽流速度是空气中声速的顺序。在离开组织表面之后，通过仍然进入的激光辐射加热颗粒，引起发光和熔化。没有观察到由各个尖峰引起的表面等离子体和弱压波。
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