Influence of absorption induced thermal initiation pathway on irradiance threshold for laser induced breakdown.
Influence of absorption induced thermal initiation pathway on irradiance threshold for laser induced breakdown.
复制标题
吸收诱导热引发路径对激光诱导击穿的辐照度阈值的影响。
DOI：
10.1364/boe.6.001234
复制
发表时间：
2015
影响因子：
3.4
通讯作者：
M. Verhagen
中科院分区：
文献类型：
--
作者：
B. Varghese;V. Bonito;M. Jurna;J. Palero;M. Verhagen
研究了透明、吸收和散射介质中热引发路径对激光诱导击穿阈值的影响。随着介质吸收系数的增加，我们观察到了从激光诱导光学击穿到激光诱导热击穿的转变。我们发现，校正后的路径长度依赖的吸收和散射损失的介质中的辐照度阈值是较低的，由于热路径的种子电子的产生相比，激光诱导的光学击穿。随着介质吸收特性的增加，辐照度阈值逐渐减小。以特定于目标发色团的较低辐照度阈值产生击穿可以提供固有的目标选择性并提高使用激光诱导击穿的皮肤处理方法的安全性和功效。
We investigated the influence of thermal initiation pathway on the irradiance threshold for laser induced breakdown in transparent, absorbing and scattering phantoms. We observed a transition from laser-induced optical breakdown to laser-induced thermal breakdown as the absorption coefficient of the medium is increased. We found that the irradiance threshold after correction for the path length dependent absorption and scattering losses in the medium is lower due to the thermal pathway for the generation of seed electrons compared to the laser-induced optical breakdown. Furthermore, irradiance threshold gradually decreases with the increase in the absorption properties of the medium. Creating breakdown with lower irradiance threshold that is specific at the target chromophore can provide intrinsic target selectivity and improve safety and efficacy of skin treatment methods that use laser induced breakdown.