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Compact freeform-surface-based Offner imaging spectrometer with both a long-slit and broadband.

Shujun Sun, Yanhong Gao, Yiqun Ji

|April 4, 2024

Summary

This summary is machine-generated.

This study introduces a compact Offner imaging spectrometer using freeform optics. It achieves a large field of view (FOV) and broadband performance in a miniaturized design, overcoming limitations of conventional spectrometers.

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Area of Science:

Optical engineering
Spectroscopy
Freeform optics

Background:

Conventional imaging spectrometers struggle with simultaneous large field of view (FOV), broadband operation, and compact size.
Achieving these features requires overcoming optical design challenges related to aberrations and system miniaturization.

Purpose of the Study:

To propose and design a compact freeform-surface-based Offner imaging spectrometer with a long-slit and broadband capabilities (CISLS).
To address the trade-offs between slit off-axis amount, system compactness, and anastigmatic imaging.

Main Methods:

Utilized vector aberration theory and analytical studies to understand Zernike polynomial contributions to astigmatism.
Employed Zernike terms Z5 and Z6 to balance astigmatism for miniaturization, and other terms to correct FOV-dependent astigmatism.
Designed a freeform-surface-based Offner spectrometer architecture.

Main Results:

The proposed compact imaging spectrometer with a long-slit (CISLS) achieved a spectral resolution of 2.7 nm.
The system operates across a broadband range of 400 nm to 1000 nm.
The spectrometer has a compact volume of 60 mm × 64 mm × 90 mm and a 30 mm long slit.

Conclusions:

The developed freeform-surface-based Offner imaging spectrometer successfully integrates a large field of view, broadband operation, and a compact structure.
This design overcomes the limitations of conventional imaging spectrometers, offering a miniaturized solution for advanced spectral imaging applications.