Development of space active optics for a whiffletree supported mirror

Area of Science:

• Optical engineering
• Space optics
• Materials science

Background:

• Lightweight mirrors for large-aperture space telescopes require precise figures and high reliability.
• Lightweight mirrors are susceptible to environmental disturbances due to low structural stability.
• Active optics can correct aberrations but are complex and rarely used in space.

Purpose of the Study:

• To validate space-based active optics technology.
• To investigate the compatibility of passive multi-supporting systems with active optics.
• To develop and test a hybrid passive-active support system for lightweight space telescope mirrors.

Main Methods:

• Developed a 0.676 m diameter lightweight mirror with a passive whiffletree support system.
• Integrated nine axial force actuators for active support, optimized via finite element analysis.
• Characterized the experimental performance of the hybrid support system under representative conditions.

Main Results:

• The passive support (9-point axial, 3-point lateral) ensures surface accuracy during ground and space integration.
• The active optics system acts as an auxiliary support within the hybrid configuration.
• Optimized actuator placement and experimental characterization confirmed system performance.

Conclusions:

• The developed hybrid passive-active support system is effective for lightweight space telescope mirrors.
• This approach enhances mirror figure precision and reliability in space environments.
• The validated technology paves the way for more complex active optics in future space telescopes.