| Citation: | Huang Dan-heng, LI Zong-xuan, REN Shu-hui, HE Yu-lin, Chartsiriwattana PEARACHAD, NING Jiu-xin, YU Dong-hui. Integrated opto-mechanical-thermal optimization and analysis of an all-aluminum space imaging spectrometer[J]. Chinese Optics. doi: 10.3724/CO.EN-2026-0008
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All-aluminum opto-mechanical systems are promising for space remote sensing due to their athermal design capability, low cost, and rapid manufacturability. However, in practical engineering, structural constraints under mechanical and thermal loads often induce parasitic stresses within the opto-mechanical assemblies, which subsequently degrade optical stability. To address this, we propose an integrated opto-mechanical optimization scheme for a spectrometer's secondary mirror flexible support. Based on an opto-mechanical-thermal integrated analysis and dimensional sensitivity evaluation under gravity and a 5 °C temperature rise, a Kriging surrogate model was developed. This model integrates fundamental frequency and optical responses to optimize structural dimensions and select the most suitable optimization result. The optimization results demonstrate a 14.2% increase in the fundamental frequency to 204.6 Hz, along with reductions of over 21% in system wavefront aberration under both gravity and thermal loads. Experimental results confirms that the mirror surface root mean square is 0.021 λ (λ = 632.8 nm), and the system wavefront aberration across five fields of view remains consistently below 0.048 λ, fully meeting the technical requirements for stable imaging performance. The proposed method effectively enhances the thermo-mechanical-optical stability of all-aluminum spectrometers and offers a valuable design framework for precision opto-mechanical systems.
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