[Study on the Design of Prism Hyperspectral Imaging System Based on Off-Axis Two-Mirror Littrow Configuration].

Area of Science:

• Optics
• Imaging Systems
• Spectroscopy

Background:

• Hyperspectral imaging systems require high spectral resolution and image quality.
• Practical applications demand miniaturization, light weight, and high optical efficiency.

Purpose of the Study:

• To design a compact, efficient hyperspectral imaging system.
• To meet the demands of miniaturization and high performance in practical applications.

Main Methods:

• Utilized an off-axis two-mirror Littrow configuration for reduced size and collimated beams.
• Applied macro programming optimization to prevent optical path interference.
• Incorporated corrective lenses and aspheric mirrors to correct spectral smile and keystone distortion.

Main Results:

• Achieved distortion less than 2.1 μm and spectral bend less than 1.3 μm (within 18% pixel).
• Modulation Transfer Function (MTF) in the visible-near infrared (VNIR) region (400-1080 nm) exceeds 0.9.
• Spectral resolution is approximately 1.6–5.0 nm with spectral transmittance over 51.5%.

Conclusions:

• The designed hyperspectral imaging system meets high spectral resolution and image quality requirements.
• The system demonstrates high transmittance and excellent image quality across the entire spectral range.
• The Littrow configuration enables a compact and efficient design suitable for practical applications.