5 March 2008 Optics performance at high-power levels
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High laser power levels combined with increasing beam quality bring optics performance into focus. The subject of optics performance is a hot topic, but lack of a common nomenclature, as well as of proper measurements, makes the situation confusing. This paper will introduce a nomenclature for comparing the performance of different types of optics. Further, the paper will present a test setup for characterizing optics, along with test results for different optics materials and designs. The main influence of high power levels on optics is a focal shift along the optical axis. In industrial applications, this might influence the performance of the process, especially if the focal shift is in the range of the Rayleigh length. In the test setup that is to be presented, the optics are exposed to a high power beam, and a pilot beam is used for measuring the change in focal position. For a proper description of optics performance, the laser beam parameters should not influence the measured results. In the nomenclature that will be presented, the performance is related to the Rayleigh length for a fundamental mode beam. The performance of optics when used with multimode beams will be presented.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ola Blomster, Magnus Pålsson, Sven-Olov Roos, Mats Blomqvist, Felix Abt, Friedrich Dausinger, Christoph Deininger, Martin Huonker, "Optics performance at high-power levels", Proc. SPIE 6871, Solid State Lasers XVII: Technology and Devices, 68712B (5 March 2008); doi: 10.1117/12.762954; https://doi.org/10.1117/12.762954

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