All-spherical catadioptric telescope with small corrector lenses

Area of Science:

• Optics
• Telescope Design
• Optical Engineering

Background:

• Spherical primary mirrors in telescopes often suffer from aberrations.
• Achieving well-corrected optical systems requires complex designs or multiple optical elements.

Purpose of the Study:

• To present a novel telescope design for realizing a well-corrected system with a large spherical primary mirror.
• To explore the use of corrector lenses in a relay configuration for improved optical performance.

Main Methods:

• Utilizing three or four small, widely spaced corrector lenses.
• Implementing a relay lens configuration for image formation.
• Incorporating a field lens at an intermediate focus to correct lateral color.

Main Results:

• The proposed design yields an erect image with an accessible real exit pupil.
• Excellent polychromatic axial correction is achieved using a single type of glass.
• The system incorporates an internal field stop for enhanced performance.

Conclusions:

• This lens configuration offers a viable solution for well-corrected telescopes with large spherical primary mirrors.
• The design demonstrates excellent chromatic correction, making it suitable for various astronomical applications.
• The useful field of view is typically limited to approximately 1 degree, with specific examples provided.