Lee, Tsung-PingTsung-PingLeeChou, Chun-HanChun-HanChouLien, RogerRogerLienHuang, Po-HsuanPo-HsuanHuangYu, Tan-YingTan-YingYuDing, Chien-FangChien-FangDingBernard, FrédéricKarafolas, NikosKubik, PhilippeMinoglou, Kyriaki2026-03-102026-03-102025-07-28[9781510693470]0277786Xhttps://www.scopus.com/record/display.uri?eid=2-s2.0-105015045793&origin=resultslisthttps://scholars.lib.ntu.edu.tw/handle/123456789/736177In this paper, we propose two blackening treatment methods to suppress stray light for future applications in observational remote sensing telescopes. Traditionally, remote sensing telescope component surfaces are treated by either attaching or coating them with space-grade blackening materials. This approach can achieve a total integrated reflectance (TIR) of less than 2% at incident angles up to 45°. However, as the incident angle increases beyond 45°, the TIR correspondingly rises, reaching as high as 6.3% at an 80° incident angle. Therefore, we propose two surface blackening treatments: one for non-3D-printable metals (e.g., Invar 36 and Al6061) and another for 3D-printable materials (e.g., Ti6Al4V, resin, and polymers). For non-3D-printable metals, the blackening process involves first creating micron-scale structures using a high-energy laser, followed by coating the surface with a blackening material (BM). This method achieves a TIR of 0.61% to 4.3% for incident angles ranging from 8° to 80°. For 3D-printable materials, microstructures are created during the 3D printing process, and the surface is then coated with Z307 or Black Matrix, yielding similar TIR results. Both methods offer over twice the stray light suppression compared to traditional techniques. In the future, these surface treatments will undergo various environmental tests to validate their applicability in upcoming space projects.false3D print microstructure6U cube-satbidirectional reflectance distribution functionblackening treatmentFORMOSAT-8laser microstructureconference paper10.1117/12.30751492-s2.0-105015045793