Petite Camille, Marcouillé Rémi, Moreau Antonin, Krol Hélène, Grèzes-Besset Catherine, Lumeau Julien, Gallais Laurent
Appl Opt. 2022 Feb 1;61(4):978-988. doi: 10.1364/AO.445045.
The development of high-power lasers requires optics with very low absorption to avoid detrimental thermal effects. In this work, we discuss our recent developments on the use of lock-in thermography to measure absorption. We apply this technique in a multipass configuration to increase the effective power on the tested samples. We present a system based on a kW-class ytterbium fiber laser operating at 1.07 µm wavelength, which enables exposing samples to 5 kW effective power and measuring absorption in the ppm range. The implementation, calibration procedure, and obtained performance are discussed with some applications to single-layer coatings of ,,,, and deposited by plasma-assisted electron beam deposition.
高功率激光器的发展需要具有极低吸收率的光学器件，以避免有害的热效应。在这项工作中，我们讨论了我们最近在使用锁相热成像技术测量吸收率方面的进展。我们将此技术应用于多程配置中，以增加测试样品上的有效功率。我们展示了一个基于波长为1.07 µm的千瓦级镱光纤激光器的系统，该系统能够使样品承受5 kW的有效功率，并测量ppm范围内的吸收率。文中讨论了该系统的实现、校准程序以及所获得的性能，并介绍了其在通过等离子体辅助电子束沉积制备的单层涂层（此处原文涂层材料信息缺失）上的一些应用。
