Abstract This work shows the impact of one Er:YAG laser pulse to both the surface and bulk of aged dammar varnishes. Tests were performed in fluences ranging from 0.56 to 2.4J/cm2 and pulse durations of 100 and 300μs. Temperature changes upon irradiation were examined by (a) live recordings with an infrared thermal camera, and (b) determining the optical properties of the varnish, which allowed for estimates of the linear absorption coefficient and the temperature rise associated with the laser irradiation. Transmission and Fourier Transform Infrared (FTIR) spectroscopy studies captured increased energy transmissions through varnish films, as well as registering a reduction of hydroxides and carbon–hydrogen bonding as a function of fluence, respectively. FTIR and Differential Scanning Calorimetry (DSC) experimentally determined the absorption coefficient and the specific heat capacity of dammar films, and an overview of laser spots was carried out with Scanning Electron Microscopy (SEM). Evidence on the varnish response to Er:YAG laser irradiation is provided.

中文翻译：

---

Er：YAG激光辐照老化达玛玛膜的热分布和氧化改性研究

摘要这项工作显示了一个Er：YAG激光脉冲对老化的dammar清漆的表面和体积的影响。以0.56至2.4J / cm2的能量密度以及100和300μs的脉冲持续时间进行测试。通过（a）用红外热像仪进行实时记录，以及（b）确定清漆的光学性能，检查辐照时的温度变化，从而可以估算线性吸收系数和与激光辐照有关的温度升高。透射和傅立叶变换红外（FTIR）光谱研究发现，通过清漆膜的能量传递增加，并且氢氧化物和碳氢键的减少分别是注量的函数。FTIR和差示扫描量热法（DSC）通过实验确定了达玛膜的吸收系数和比热容，并使用扫描电子显微镜（SEM）进行了激光斑点的概述。提供了关于清漆对Er：YAG激光照射的响应的证据。