Intro Summary Choosing between an aspheric and a freeform surface in a space optical system is not simply a question of optical performance. The decision affects the complete optomechanical architecture, including mass, package volume, substrate selection, manufacturability, metrology, alignment, thermal stability, and qualification risk. Aspheres remain the more efficient choice when rotational symmetry can be […]
Surface Figure Control for High-Performance Aspheric Mirrors in Space Optics High-performance aspheric mirrors used in space optical systems require more than a low final RMS value. Surface figure, roughness, subsurface condition, edge behaviour, spatial-frequency error, and metrology uncertainty must all be controlled within the same manufacturing strategy. This application note examines a representative space mirror […]
Design Trade-offs in Compact Multispectral Reflective Imaging Systems Advanced imaging systems for aerospace and environmental remote sensing are increasingly expected to combine multiple spectral bands, compact packaging, high image quality, and stable operation in demanding environments. For systems spanning visible, near-infrared, and thermal infrared wavelengths, the challenge is not simply achieving good optical performance in […]
Engineering Criteria for Selecting Infrared Lenses Infrared lens selection should not begin with focal length, F-number, or price. For experienced engineers, the more useful question is: Which optical characteristics are actually critical to system performance under the intended operating conditions? A lens that performs well at room temperature may fail across a wide thermal range. […]
Key Takeaways Reverse engineering an optical system is not simply a matter of copying measured geometry. A physical sample reflects manufacturing tolerances, assembly errors, wear, and aging—not only original design intent. Reliable reconstruction requires correlating component measurements with system-level optical performance. Modern materials, coatings, and mechanical architectures can improve manufacturability and performance without unnecessarily changing […]
Zinc Sulfide Infrared Windows for Space Systems Infrared windows used in space systems must do more than transmit light. They may also need to withstand thermal cycling, vibration, pressure changes, particle impact, radiation, contamination, rain, sand, or repeated cleaning. At the same time, they must preserve the signal quality required by the detector behind them. […]
Key Takeaways Large-aperture transmissive optics require system-level control of wavefront error across design, fabrication, alignment, and qualification. Broadband performance from 400 to 1000 nm depends on material selection, melt data, thermal behavior, and tolerance allocation. For 300–340 mm elements, gravity, fixture loading, mounting stress, and metrology conditions must be treated as optical error sources. Final […]
Key Takeaways Avantier partnered on the development of a custom five-mirror optical system for a high-end space telescope designed for demanding space observation applications. The project required the integration of ultra-high optical precision, lightweight structural architecture, and long-term environmental stability within a compact system envelope. To meet these requirements, Avantier provided end-to-end engineering support covering […]
Key Takeaways Modern space telescopes depend on 6-DOF positioning systems not simply for alignment, but for maintaining optical performance throughout launch, deployment, thermal cycling, and long-term operation. These systems serve as critical error-budget management tools, compensating for residual misalignments, structural drift, thermal distortion, and pointing instability. Technologies such as hexapods, fine steering mirrors, and segmented […]
Key Takeaways Custom long-wave infrared (LWIR) space telescopes are critical for advanced aerospace remote sensing applications, including Earth observation, environmental monitoring, and target detection. Designing these systems requires overcoming significant challenges in thermal stability, infrared material selection, aberration correction, dual-band performance, and space-environment survivability. Through advanced optical design, passive athermalization, precision aspherical manufacturing, aerospace-grade coatings, […]
