Experimental and numerical investigations on cooling performance of chemical-vapor-deposited SiC deformable mirror for adaptive optics system in high-power laser radiation environments. (25th February 2022)

• Record Type: Journal Article
• Authors: Bae, Ji Yong; Hur, Hwan; Kim, I. Jong; Lee, Kye-Sung; Kihm, Hagyong; Rhee, Hyug-Gyo; Yang, Ho-Soon; Kim, Hong-Seung; Hyun, Sangwon
• Is Part Of: Applied thermal engineering. Volume 203(2022)
• Publication Date: 2022-02-25
• Subjects: Adaptive optics system -- Chemical-vapor-deposited SiC -- Deformable mirror -- Fluid-thermal-structural coupling characteristics -- High-power laser radiation -- U-shaped cooling microchannels; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2021.117950
• Languages: English
• ISSNs: 1359-4311

Abstract

Graphical abstract: Highlights: A large-diameter CVD SiC U-WDM for use in AO systems utilizing an HPLR system was presented. The cooling performance of the CVD SiC U-WDM was investigated under HPLR conditions. Fluid-thermal-structural coupling characteristics of the CVD SiC U-WDM were analyzed. The CVD SiC U-WDM dramatically decreased the thermal deformation to submicron scale. Abstract: In an adaptive optics system combined with a high-power laser radiation (HPLR) system, the thermal deformation of a deformable mirror (DM), which is induced by high-energy irradiation, is a significant factor influencing the optical performance of the system. In particular, the thermal deformation of the DM with a large diameter of more than a few hundred millimeters should be controlled to be on the order of 1 μm in various HPLR environments. To satisfy these challenging criteria, we experimentally and numerically investigated the cooling performance of a large-diameter water-cooled DM (WDM) with U-shaped cooling microchannels (U-WDM) made of chemical-vapor-deposited SiC, which was designed first in our previous research. The fluid-thermal-structural coupling characteristics of the U-WDM were verified and analyzed through the verification process. In addition, the fluid-thermal-structural coupling characteristics of the DM and U-WDM were compared and analyzed by applying four different HPLR conditions: annular, circular, holed-square, and square beams. Under all the HPLR conditions, the comparative study demonstrated that the U-WDM had dramatic cooling performance, reducing the thermal deformation by more than 85% compared to that of the DM and achieving submicron-scale thermal displacement, which was lower than the targeted actuator deformation limit of 1.3 μm.