Design, Analysis, and Manufacturing of Diffractive Achromatic Optical Systems

Area of Science:

• Optical Engineering
• Diffractive Optics
• Imaging Systems

Background:

• Increasing resolution demands challenge conventional optics, requiring larger apertures that complicate manufacturing and transport.
• Diffractive optics offer lightweight designs but often compromise image quality due to inherent chromatic aberrations.

Purpose of the Study:

• To propose a wide-band imaging system overcoming the limitations of conventional and purely diffractive optics.
• To achieve a lightweight, large-aperture system with high resolution and achromatic performance across a broad spectrum.

Main Methods:

• Utilized the Schupmann achromatic model to ensure system chromatic correction.
• Incorporated harmonic diffractive optics as the primary lens to achieve a compact focus.
• Designed and fabricated an 80 mm aperture diffractive optical system for the 400-900 nm spectral band.

Main Results:

• The designed system achieved an actual resolution of 76.196 line pairs per millimeter.
• The system successfully accomplished its achromatic imaging task across the specified wide band.
• Demonstrated a significantly reduced aperture for the relay lens, contributing to a lightweight design.

Conclusions:

• The proposed wide-band achromatic imaging system design is validated through theoretical and experimental results.
• The integration of diffractive optics with the Schupmann model provides a viable solution for high-resolution, lightweight imaging.
• This work lays the groundwork for advanced large-aperture diffractive telescopes.