Optical design of a 5× zoom afocal telescope with deformable mirrors

Area of Science:

• Optical Engineering
• Telescope Design
• Adaptive Optics

Background:

• All-reflective zoom afocal telescopes offer flexible imaging capabilities.
• Integration with existing systems requires adaptable foreoptics.
• Deformable mirrors present a potential solution for dynamic optical adjustments.

Purpose of the Study:

• To design a 5x zoom afocal telescope utilizing deformable mirrors.
• To address aberrations introduced by tilted mirrors in a reflective system.
• To validate the design methodology through image simulations.

Main Methods:

• Matrix optics were used to determine first-order parameters for a coaxial reflective telescope.
• Three deformable mirrors and a fixed primary mirror were incorporated.
• XY polynomial surfaces were employed on mirrors to correct asymmetric aberrations.

Main Results:

• A 5x zoom afocal telescope design was successfully developed.
• Asymmetric aberrations caused by tilted mirrors were corrected.
• Simulations demonstrated good image quality with a maximum RMS wavefront error < 0.125λ.

Conclusions:

• The proposed design methodology is effective for creating zoom afocal telescopes.
• Deformable mirrors enable flexible and high-quality zoom imaging.
• The system can be integrated as a foreoptic for various imaging applications.