The beam waist relative variation (BWRV) method known as a Z-scan based technique is used to demonstrate its feasibility in characterizing the thermal effects induced by a continuous laser beam in different materials. A study of several classical solvent-based solutions (water, ethanol, methanol …) is carried out before introducing the extension of the BWRV method to laterally map the tested sample. We show that the transverse xy-scan of the sample allows to extract an image of the phase shift due to local thermal heating. This new device, called XYZ-scan, is designed for the thermal characterization of inhomogeneous samples. An example will be given on an inhomogeneous $1.6\mu m$ thick thin film doped with silver nanoparticles.

使用束腰相对变化（BWRV）方法（称为Z扫描技术）来证明其在表征由连续激光束在不同材料中引起的热效应的可行性。在引入BWRV方法的扩展以横向绘制测试样品之前，先对几种经典的基于溶剂的溶液（水，乙醇，甲醇等）进行了研究。我们表明，样品的横向xy扫描允许提取由于局部热引起的相移图像。这款名为XYZ-scan的新设备旨在对不均匀样品进行热表征。一个不均匀的例子$1.6\mu 米$ 纳米银掺杂的厚薄膜。