The laser-induced damage threshold (LIDT) is a critical parameter affecting the performance of high-power laser systems. In LIDT testing, laser type, operating conditions, and measurement parameters frequently require adjustment according to specific testing needs, making the development of a versatile system with rapid parameter-switching capabilities essential. Building upon previous automated LIDT measurement systems, we have developed a desktop, integrated, and convenient LIDT measurement instrument based on international standards. This desktop design enables flexible switching between nanosecond pulsed and continuous-wave lasers, allowing for standardized, fully automated testing while accommodating multiple measurement protocols. This system is capable of detecting minute defects in tested components and assessing the stability of damage growth points. Additionally, integrated control software developed in LabVIEW facilitates highly accurate, synchronized acquisition and storage of multiple beam parameters in real time, correlating parameters of each laser pulse, damage images, and data processing. The system also provide s a range of integrated functionalities, including sample angle adjustment, front and rear surface identification, damage site reinspection, and automated report generation.
The Solar Upper Transition Region Imager (SUTRI) is an extreme ultraviolet solar imaging telescope that focuses on dynamically observing the solar transition region within a narrow band at 46.5nm. This paper describes the optical parameters, optomechanical structural design, finite element simulation, and on-ground environmental testing. To satisfy the narrow band requirement, the telescope employs multilayers coated on Ritchey-Chrétien optics and filters mounted at the front aperture and ahead of the focal plane. The primary and secondary mirrors are glued to invar frames that provide peripheral support. The telescope contains three mechanisms, which are a focus mechanism, a filter wheel, and a front door. In addition, this paper carried out finite element simulation of modal analysis, optical performance and structural strength. These simulations verified that the opto-mechanical system design is feasible. Finally, the telescope successfully underwent a series of on-ground environmental testing and was subsequently launched carried by SATech-01 satellite in July 2022.
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